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Coupled effect of SiO2 content and hydrogen-enriched atmospheres on the reduction behavior and microstructural evolution of fired hematite pellets 认领 引用
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作者 Bohua Li Deqing Zhu +3 位作者 Zhengqi Guo Jian Pan Congcong Yang Siwei Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第6期1925-1937,共13页
As demand grows for low-carbon ironmaking,it is essential to understand how hydrogen reduces iron ore pellets under vary-ing gangue compositions and gas atmospheres.In this work,fired hematite pellets with a basicity(... As demand grows for low-carbon ironmaking,it is essential to understand how hydrogen reduces iron ore pellets under vary-ing gangue compositions and gas atmospheres.In this work,fired hematite pellets with a basicity(mass ratio of CaO to SiO2)of 0.3 and SiO2contents ranging from 1wt%to 4wt%were systematically investigated under three typical shaft furnace atmospheres(Midrex,HYL,and coke oven gas(COG))as well as under 100%H2,to clarify the reduction kinetics,reaction mechanism,and microstructural evolution of the fired pellets.The results indicate that a higher hydrogen proportion significantly accelerates the reduction rate of the fired pellets,while an increase in SiO2content generally leads to a decrease in the overall reaction rate.However,the effect of hydrogen concentration on the reduction behavior of the fired pellets varied markedly with their silicon content.For the fired pellets containing 1wt%and 2wt%SiO2,an increase in hydrogen concentration causes deterioration in reduced pellet characteristics,as evidenced by the increase in reduc-tion swelling index from 26.14%to 34.26%and the decrease in cold compressive strength from 110 to 78 N.In contrast,fired pellets with 3wt%and 4wt%SiO2exhibit the opposite trend,with the reduction swelling index decreasing from 15.26%to 9.23%and cold compress-ive strength improving from 179 to 271 N.Kinetics analysis indicates that under 100%H2,the reduction of fired pellets with 1wt%SiO2is governed by a mixed gas-diffusion and uniform reaction model,whereas fired pellets with 4wt%SiO2follow an unreacted core model.These differences in reduction kinetics,reduction behavior,and post-reduction properties are closely associated with the formation of more Al-bearing calcium silicate slag phases in high-SiO2reduced pellets,which strengthen intergranular bonding,buffer phase-trans-formation-induced stress,and promote the evolution of metallic iron from whisker-like to granular or layered morphologies. 展开更多
关键词 hydrogen metallurgy fired pellets silica content reducing atmosphere microstructural evolution iron nucleation behavior
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Microstructural evolution and strengthening mechanism of Mg-Gd-Y-Zn-Zr alloy fabricated by wire arc additive manufacturing:Effects of heat treatment on mechanical properties 认领 引用
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作者 Limin Zhang Dongdong Zhang +6 位作者 Zizheng Zhang Jiarui Hu Ke Li Yunlong Li Liqin Wang Zhanyong Zhao Peikang Bai 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第7期2227-2238,I0008,共12页
Thin-walled Mg-8.5Gd-2.5Y-1.8Zn-0.5Zr(GWZ932)alloy component was successfully fabricated by the cold metal transfer(CMT)based wire-arc additive manufacturing(WAAM)process.Considering the significant influence of secon... Thin-walled Mg-8.5Gd-2.5Y-1.8Zn-0.5Zr(GWZ932)alloy component was successfully fabricated by the cold metal transfer(CMT)based wire-arc additive manufacturing(WAAM)process.Considering the significant influence of secondary phases on mechanical properties,we regulated the secondary phases through heat treatment.As-deposited sample exhibits the typical layered microstructure with alternating coarse/fine grains,along with a lot of Mg3(RE,Zn)eutectic phases at grain boundaries(GBs).After solid-solution treatment,these eutectic phases are transformed into coarse X phase at GBs and fine lamellar 14H long period ordered stacking(14H-LPSO)phases in grain interiors.Further peak-aging induces amounts of prismaticβ'phases precipitated in theα-Mg matrix,which produces the strong precipitation hardening effect.Note that prismaticβ'phases are perpendicular to basal 14H-LPSO phase in space,which can form a closed space that blocks dislocation motions more effectively.Thus,peakaged sample exhibits a high tensile strength of(314±3)MPa and an acceptable ductility of4.3%±0.6%,which outperforms most Mg-Gd-Y series alloys prepared by WAAM reported previously.Our work provides a basis for forming thin-walled Mg-Gd-Y series components with high strength via WAAM process,but the deposition process should be further optimized. 展开更多
关键词 Rare earths Wire-arc additive manufacturing Mg-RE alloys Microstructure evolution Mechanical properties
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From macro-,through meso-to micro-scale:Densification behavior,deformation response and microstructural evolution of selective laser melted Mg-RE alloy 认领 引用 被引量：5
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作者 Cheng Chang Guangrui Yao +6 位作者 Sophie C.Cox Xiaofeng Zhang Liyuan Sheng Min Liu Weili Cheng Yang Lu Xingchen Yan 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第8期3947-3963,共17页
To clarify the densification behavior,deformation response and strengthening mechanisms of selective laser melted(SLM)Mg-RE alloys,this study systematically investigates a representative WE43 alloy via advanced materi... To clarify the densification behavior,deformation response and strengthening mechanisms of selective laser melted(SLM)Mg-RE alloys,this study systematically investigates a representative WE43 alloy via advanced material characterization techniques.A suitable laser output mode fell into the transition mode,allowing for the fabrication of nearly full-density samples(porosity=0.85±0.021%)with favorable mechanical properties(yield strength=351 MPa,ultimate tensile strength=417 MPa,the elongation at break=6.5%and microhardness=137.9±6.15 HV0.1)using optimal processing parameters(P=80 W,v=250 mm/s and d=50μm).Viscoplastic self-consistent analysis and transmission electron microscopy observations reveal that the plastic deformation response of the SLM Mg-RE alloys is primarily driven by basal and prismatic slips.Starting from a random texture before deformation(maximum multiple of ultimate density,Max.MUD=3.95),plastic stretching led the grains to align with the Z-axis,finally resulting in a{0001}texture orientation after fracture(Max.MUD=8.755).Main phases of the SLM state are mainly composed ofα-Mg,Mg24Y5 andβ'-Mg41Nd5,with an average grain size of only 4.27μm(about a quarter of that in the extruded state),resulting in a favorable strength-toughness ratio.Except for the nano-β'phase and semi-coherent Mg24Y5 phase(mismatch=16.12%)around the grain boundaries,a small amount of nano-ZrO2 and Y2O3 particles also play a role in dispersion strengthening.The high mechanical properties of the SLM state are chiefly attributed to precipitation hardening(44.41%),solid solution strengthening(34.06%)and grain boundary strengthening(21.53%),with precipitation hardening being predominantly driven by dislocation strengthening(67.77%).High-performance SLM Mg-RE alloy components were manufactured and showcased at TCT Asia 2024,receiving favorable attention.This work underscores the significant application potential of SLM Mg-RE alloys and establishes a strong foundation for advancing their use in the biomedical fields. 展开更多
关键词 Selective laser melting Mg-RE alloys Microstructural evolution Mechanical properties Plastic deformation mechanism
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Strain rate effects on mechanical properties,microstructural evolution,and deformation mechanisms of high manganese steels 认领 引用 被引量：3
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作者 Dong Liu Dapeng Yang +3 位作者 Yong Hou Yunjie Li Guodong Wang Hongliang Yi 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第34期219-255,共37页
High manganese steels(HMS),known for their exceptional strength-ductility balance,are increasingly utilized in dynamic loading applications.This review examines the effects of strain rate on their mechanical propertie... High manganese steels(HMS),known for their exceptional strength-ductility balance,are increasingly utilized in dynamic loading applications.This review examines the effects of strain rate on their mechanical properties and microstructural evolution,focusing on strain rate hardening,adiabatic heating softening,and dynamic strain aging(DSA).The influence of strain rate on yield strength,ultimate tensile strength,strain hardening,and ductility is discussed,highlighting both positive and negative sensitivities across different alloy compositions and strain rate regimes.The strain rate response of various deformation mechanisms,including deformation twinning,dislocation slip,and phase transformation,is examined alongside their influence on microstructural evolution,alloy design,and industrial applications.The intricate role of DSA is also analyzed,emphasizing its contribution to strain rate sensitivity.To optimize HMS for dynamic environments,future research should focus on advanced modeling and processing techniques,in-situ characterization methods,and a deeper understanding of thermally activated processes and stacking fault energy-controlled mechanisms.This review provides insights into strain rate effects,guiding alloy design,and technological advancements of the new HMS. 展开更多
关键词 High manganese steels Strain rate sensitivity Yield strength Strain hardening Deformation mechanisms Microstructural evolution Dynamic strain aging
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Microstructural Evolution of Rapidly Solidified Ni-Cu Alloys 认领 引用
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作者 QU Shuwei LI Zejun +4 位作者 WANG Hongfu TIAN Xiaoguang QIAN Zhike LI Ruiqin YAO Wei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2025年第6期1759-1765,共7页
This study systematically investigated the microstructural evolution of binary Ni-Cu alloys(Cu55Ni45,Cu60Ni40,and Ni65Cu35)under deep undercooling conditions.The controlled rapid solidification experiments combined wi... This study systematically investigated the microstructural evolution of binary Ni-Cu alloys(Cu55Ni45,Cu60Ni40,and Ni65Cu35)under deep undercooling conditions.The controlled rapid solidification experiments combined with optical microscopy and electron backscatter diffraction(EBSD)analysis demonstrate that increasing undercooling(ΔT)can induce a consistent sequence of microstructural transitions:coarse dendrites,fine equiaxed grains(first refinement),oriented fine dendrites,and fine equiaxed grains(second refinement).Two distinct grain refinement events are identified,with critical undercooling thresholds(ΔT)dependent on composition:increasing Cu content increases the critical undercoolingΔT*required for the second refinement(Cu55Ni45:227 K;Cu60Ni40:217 K;Ni65Cu35:200 K).The BCT(Bridgman Crystal Growth)model quantitatively elucidates this behavior,revealing a shift from solute-diffusion-dominated growth at low undercooling to thermally dominated diffusion at high undercooling(ΔT).Crucially,refined grains at high undercooling exhibit smaller sizes(10μm)and higher uniformity than those at low undercooling(20μm).These findings provide fundamental insights into non-equilibrium solidification mechanisms and establish a foundation for designing high-performance Ni-Cu alloys via deep undercooling processing. 展开更多
关键词 deep undercooling Ni-Cu alloys microstructural evolution grain refinement BCT model rapid solidification
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Phase Transformation and Microstructural Evolution of Austenitic Stainless Steel Based on High-pressure Torsion 认领 引用
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作者 BIAN Runyu QIAN Chenhao +2 位作者 DONG Ying WU Siyuan SHAO Hengrui 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2025年第6期1766-1773,共8页
The 304 austenitic stainless steel was processed by high-pressure torsion(HPT)at room temperature with 10,20,and 30 rotations under a pressure of 3 GPa and a rotation speed of 1 r/min.The phase transformation and micr... The 304 austenitic stainless steel was processed by high-pressure torsion(HPT)at room temperature with 10,20,and 30 rotations under a pressure of 3 GPa and a rotation speed of 1 r/min.The phase transformation and microstructural evolution of 304 stainless steel after HPT were investigated by X-ray diffraction(XRD)analysis,electron backscatter diffraction(EBSD)analysis,transmission electron microscopy(TEM),nanoindentation test and differential scanning calorimetry(DSC)analysis.The experimental results show that HPT causes elongated nanocrystalline grains of 25 nm width along the torsion direction.After 10 turns of HPT,the deformation-induced martensitic transformation is completed and the hardness increases from 3 GPa to 8.5 GPa at the edge of the disc.However,a local reverse phase transformation from martensite to austenite is observed in the peripheral regions of the sample after 30 turns of HPT,leading to a higher volume fraction of austenite,and the hardness of the sample also decreases accordingly. 展开更多
关键词 304 stainless steel high-pressure torsion phase transformation microstructural evolution hardness
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Influence of cooling rate upon weld metal microstructural evolution behaviors of EH36 shipbuilding steel 认领 引用 被引量：1
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作者 Xiao-bo Yuan Yong-wu Wu +3 位作者 Ming Zhong Jun-jie Ma Imants Kaldre Cong Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第2期466-472,共7页
Microstructural evolution features have been systematically investigated for the weld metal of EH36 shipbuilding steel under an in situ confocal scanning laser microscope.The influence of cooling rate on microstructur... Microstructural evolution features have been systematically investigated for the weld metal of EH36 shipbuilding steel under an in situ confocal scanning laser microscope.The influence of cooling rate on microstructural changes during the transformation from austenite to ferrite has been clarified.It is found that ferrite side plates form preceding to acicular ferrites,although the starting temperature of respective component decreases as the cooling rate is raised.In particular,the growth rate of acicular ferrite is measured to increase significantly,rising from 30.4μm/s at a cooling rate of 3 K/s to 109.0μm/s at 15 K/s,driven primarily by an ever-increasing degree of undercooling.These findings highlight the critical role of cooling rate in dictating the sequence and growth rate of microstructural transformations,which is crucial for optimizing welding processes to obtain desired microstructures while avoiding the formation of deleterious components. 展开更多
关键词 Cooling rate Shipbuilding steel Weld metal Microstructural evolution
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Microstructural evolution and current-carrying tribological performance of an Ag-Cu alloy subjected to surface severe plastic deformation 认领 引用 被引量：2
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作者 Youwang Tu XiuChong Zhu +1 位作者 Xiao Kang Lei Zhang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第33期28-43,共16页
Ag-Cu alloys are extensively used in sliding electric contacts due to their superior electrical conductivity,but their limited wear resistance reduces component longevity.Surface severe plastic deformation(SSPD)has em... Ag-Cu alloys are extensively used in sliding electric contacts due to their superior electrical conductivity,but their limited wear resistance reduces component longevity.Surface severe plastic deformation(SSPD)has emerged as a promising method to enhance wear resistance and reduce friction of metals without altering the matrix composition.In this study,an Ag-20 wt.%Cu alloy was subjected to SSPD for various durations,with the aim of improving tribological performance.The microstructure,hardness,and current-carrying tribological performance under different currents were systematically investigated,along with an exploration of the underlying mechanisms.The results show that in addition to introducing a high density of dislocations on the surface,SSPD also encourages the formation of(111)texture,and particularly disperses the initially long strips of Curich phase into short strips and fine particles.It promotes a tribo-film composed primarily of a mixture of Cu2O and CuO that forms on the worn surface of the surface-treated sample under the 1 A current,thus significantly reducing the friction coefficient and electrical noise.Under the 10 A current,the sample treated for 60 min possesses the optimal friction coefficient(0.429),wear rate(0.791×10−6mm3/(N m)),and electrical noise(0.240 V).In contrast to the Ag/Cu layered structure observed on the worn subsurface of the untreated sample,a single-phase Ag(Cu)solid solution forms on the worn subsurface of the 60-min treated sample,which improves the current-carrying tribological performance.This work provides valuable insights for the development and application of electrical contact alloys with excellent performance. 展开更多
关键词 Ag-Cu alloy Surface severe plastic deformation Current-carrying friction Microstructure evolution Ag(Cu)supersaturated solid solution
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Microstructural evolution of GH4742 superalloy during hot deformation and subsequent solvus treatment 认领 引用
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作者 Wen-wen Zhang Xin-gang Liu +4 位作者 Shuai-jie Wang Yu-jiao Ke Ying Guo He-yong Qin Qiang Tian 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第3期812-832,共21页
Isothermal compression tests were used to establish constitutive models of the hot deformation of GH4742 superalloy. The microstructural evolution of double cone samples with large strain gradients during hot deformat... Isothermal compression tests were used to establish constitutive models of the hot deformation of GH4742 superalloy. The microstructural evolution of double cone samples with large strain gradients during hot deformation and subsequent solvus treatment was studied. The results showed that the grain size during dynamic recrystallization (DRX) did not exceed 6 μm, and the volume fraction during DRX did not exceed 45% at all reduction rates when it deformed below the γ′ solvus temperature (1080 ℃). When deformed near the γ′ solvus temperature (1110 ℃), the volume fraction and grain size increase significantly during DRX due to the dissolution and coarsening of some γ′ precipitates. When deformed above the γ′ solvus temperature (1140 ℃), even at a high reduction rate of 20 mm/s, the volume fraction during DRX reached 75%, and the grain size during DRX increased to 25 μm. At a reduction rate of 0.5 mm/s, the grain size during DRX reached 65 μm. When the sample is deformed below the γ′ solvus temperature (1080 ℃), stored strain energy accumulates in the sample, which is beneficial for the development of post dynamic recrystallization during subsequent subsolvus heat treatment, resulting in a noticeable increase in the recrystallization volume fraction. The recrystallization volume fraction of predeformed samples deformed at 1110 and 1140 ℃, followed by subsolvus heat treatment, was almost unchanged. The microstructure of the predeformed sample following supersolvus heat treatment consists of coarse equiaxed grains. 展开更多
关键词 GH4742 superalloy Solvus heat treatment γ′precipitate Dynamic recrystallization Microstructural evolution
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Microstructural evolution,mechanical properties and corrosion resistance of Ti-12Ni alloy fabricated by laser powder bed fusion 认领 引用
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作者 Kai HUANG Yao-jia REN +6 位作者 Qing-ge WANG Yi LIU Quan FU Ning LI Ian BAKER Min SONG Hong WU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第11期3734-3750,共17页
The microstructural evolution,mechanical properties,and corrosion behavior of Ti-12Ni(wt.%)specimens produced by laser powder bed fusion(LPBF)using various volume energy density(VED)processing parameter values were in... The microstructural evolution,mechanical properties,and corrosion behavior of Ti-12Ni(wt.%)specimens produced by laser powder bed fusion(LPBF)using various volume energy density(VED)processing parameter values were investigated.The results showed that the alloy prepared at a low VED of 67 J/mm3consisted of near-βgrains.At a VED of 133 J/mm3,the alloy exhibited coarse primary Ti2Ni and fine eutectoid structure.This eutectoid structure consisted ofαlaths and two types of nanoscale Ti2Ni,one in the form of short rods and the other with a spherical morphology.Further increase of the VED to 267 J/mm3led to coarsening of the eutectoid structure.The dispersed Ti2Ni nanoparticles exhibited a significant strengthening effect.The alloy produced at a VED of 133 J/mm3showed the greatest strength with a nanohardness of(7.8±0.1)GPa and a compressive strength of(1777±27)MPa.However,the presence of Ni segregation and holes produced by the LPBF processing adversely affected the corrosion resistance of the alloy. 展开更多
关键词 Ti-12Ni alloy laser powder bed fusion microstructural evolution mechanical properties corrosion resistance
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Microstructural evolution and mechanical properties of Ti43Al alloy by directional annealing 认领 引用
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作者 Li Zhou Jie-ren Yang +2 位作者 Yun-lu Ma Ze-dong Liu Rui-run Chen 《China Foundry》 SCIE EI CAS CSCD 2025年第3期273-282,共10页
The directional annealing technique is widely used to prepare columnar grains or single crystals.To investigate the effect of hot zone temperature and temperature gradient on the growth of columnar crystals,Ti43Al all... The directional annealing technique is widely used to prepare columnar grains or single crystals.To investigate the effect of hot zone temperature and temperature gradient on the growth of columnar crystals,Ti43Al alloys were heat treated by the directional annealing technique and their mechanical properties were tested.The results show that columnar grains with a maximum size of 22.29 mm can be obtained at a hot zone temperature of 1,350℃ and a temperature gradient of 8 K·mm-1.During the directional annealing process,Ti43Al alloys are heated toαsingle-phase domain to start the phase transformation.Columnar grains with a microstructure of fully lamellar colonies are obtained at different hot zone temperatures and temperature gradients.The distribution of the orientation difference for theα2 phase was found to be more random,suggesting that the growth of the columnar crystals may be stochastic in nature.Tensile testing results show that the strength and elongation of directional annealed Ti43Al alloy at 1,400℃-8 K·mm-1 are 411.23 MPa and 2.29%,and the remaining directional annealed alloys show almost plasticity. 展开更多
关键词 TiAl alloys directional annealing microstructural evolution EBSD,mechanical properties
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Effects of sintering temperature on microstructural evolution and properties of Co1.5CrFeNi1.5Ti0.6 high-entropy alloy 认领 引用 被引量：1
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作者 Chao WANG Wei-zheng AN +4 位作者 Qiang MA Xiang WANG Jia-xin LI Zhao-yang LIANG Qi-dong NIE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第9期3000-3019,共20页
In order to develop a marine engineering material with excellent mechanical properties and corrosion resistance,a novel non-equiatomic Co1.5CrFeNi1.5Ti0.6high-entropy alloy(HEA)was fabricated through mechanic... In order to develop a marine engineering material with excellent mechanical properties and corrosion resistance,a novel non-equiatomic Co1.5CrFeNi1.5Ti0.6high-entropy alloy(HEA)was fabricated through mechanical alloying and spark plasma sintering.The results revealed that the sintering temperature significantly affected the microstructure and phase composition of the HEA owing to the diffusion rate,homogenization,and sluggish diffusion effect of metal atoms.At sintering temperatures below 1050℃,HEA mainly consisted of face-centered cubic(FCC),Ni3Ti(ε),Ni2.67Ti1.33(R),and Fe-Cr(σ)phases.The microstructure of alloy comprised coarse dendritic crystals,whose content and size gradually decreased with increasing sintering temperature.However,the HEA sintered above 1100℃contained only fine equiaxed crystals.HEA sintered at 1100℃featured only the FCC solid solution,while theε-phase precipitated at temperatures above 1150℃.At a sintering temperature of 1050℃,the alloy microstructure consisted of short rod-like dendrites and fine equiaxed crystals.This alloy achieved the highest yield strength of 1198.71 MPa owing to the effects of precipitation strengthening and grain boundary strengthening.Meanwhile,HEA sintered above 1050℃exhibited significantly improved corrosion resistance.Considering the microstructure,mechanical,and corrosion properties,1050℃was identified as the optimal sintering temperature for Co1.5CrFeNi1.5Ti0.6HEA. 展开更多
关键词 Co1.5CrFeNi1.5Ti0.6high-entropy alloy corrosion resistance microstructure evolution sintering temperature strengthening mechanism
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Microstructural evolution of ultra-high strength Al-Zn-Cu-Mg-Zr alloy containing Sc during homogenization 认领 引用 被引量：26
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作者 李文斌 潘清林 +2 位作者 肖艳苹 何运斌 刘晓艳 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第10期2127-2133,共7页
The microstructural evolution and composition distribution of an Al-Zn-Cu-Mg-Sc-Zr alloy during homogenization were investigated by optical microscopy（OM）,scanning electron microscopy（SEM）,energy dispersive spectr... The microstructural evolution and composition distribution of an Al-Zn-Cu-Mg-Sc-Zr alloy during homogenization were investigated by optical microscopy（OM）,scanning electron microscopy（SEM）,energy dispersive spectrometry（EDS）,X-ray diffraction（XRD） and differential scanning calorimetry（DSC）.The results show that severe dendritic segregation exists in Al-Zn-Cu-Mg-Sc-Zr alloy ingot.There are a lot of eutectic phases at grain boundary and the distribution of the main elements varies periodically along interdendritic region.The main eutectic phases at grain boundary are Al7Cu2Fe phase and T（Al2Mg3Zn3）.The residual phases are dissolved into the matrix gradually during homogenization with increasing temperature and prolonging holding time,which can be described by a constitutive equation in exponential function.The overburnt temperature of the alloy is 473.9 ℃.The optimum parameters of homogenization are 470 ℃ and 24 h,which is consistent with the result of homogenization kinetic analysis. 展开更多
关键词 Al-Zn-Cu-Mg-Sc-Zr alloy homogenization microstructural evolution overburnt temperature homogenization kinetics
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Microstructural evolution and stress state related to mechanical properties of electron beam melted Ti-6Al-4V alloy modified by laser shock peening 认领 引用 被引量：21
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作者 Liang Lan Xinyuan Jin +2 位作者 Shuang Gao Bo He Yonghua Rong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2020年第15期153-161,共9页
This work characterizes microstructural evolutions of electron beam melted(EBM) Ti-6 Al-4 V alloy modified via laser shock peening(LSP).The depth stress distribution and tensile properties of EBM Ti-6 Al-4 V alloy wer... This work characterizes microstructural evolutions of electron beam melted(EBM) Ti-6 Al-4 V alloy modified via laser shock peening(LSP).The depth stress distribution and tensile properties of EBM Ti-6 Al-4 V alloy were measured before and after LSP.The results indicate that microstructure consists of β phase with 7.2%±0.4% vol.% and balance α lamellar in EBM sample,and the α lamella was refined into nano-equiaxed grains and submicro-equiaxed grains after LSP.The dominant refinement mechanism is revealed during LSP.Stacking faults were found in the LSP-treated sample,and their corresponding planes were determined as(0001) basal plane,(1010) prismatic plane,and(1011) pyramidal plane obtained by high resolution transmission electron microscopy.The subgrains and high-angle grains formed during dynamic recrystallization were identified by selected area electron diffraction pattern.The LSP treatment produces a significantly residual compressive stress approximately-380 MPa with the depth of compressive stress layer reaching 450 μm.Strength and elongation of the EBM sample were significantly increased after LSP.The strength and ductility enhancements are attributed to compre s sive stress,grain refinement and grain gradient distribution of α phase. 展开更多
关键词 Electron beam melting Ti-6Al-4V alloy Laser shock peening Microstructural evolution Stress state Mechanical properties
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The effects of orientation control via tension-compression on microstructural evolution and mechanical behavior of AZ31 Mg alloy sheet 认领 引用 被引量：16
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作者 Qingshan Yang Bin Jiang +5 位作者 Bo Song Zujian Yu Dewei He Yanfu Chai Jianyue Zhang Fusheng Pan 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2022年第2期446-458,共13页
The grain orientation control via twinning activity on deformation features is of great significance to offer a key insight into understanding the deformation mechanism of Mg alloy sheets.The{10–12}twinning were perf... The grain orientation control via twinning activity on deformation features is of great significance to offer a key insight into understanding the deformation mechanism of Mg alloy sheets.The{10–12}twinning were performed by pre-strain paths,i.e.,tension(6%)and compression(5%)perpendicular to the c-axis along extrusion direction(ED),to investigate the microstructural evolution and mechanical properties of AZ31 Mg alloy sheets.The distinction in the texture evolution and strain hardening behavior was illustrated in connection with the pre-strain paths for the activities of twinning and slip.The result shows that the activation of the deformation mode was closely bound up with the grain orientation and the additional applied load direction.The{10–12}twin-texture components with c-axis//ED were generated by precompression,which can provide an appropriate alternative to accommodate the thin sheet thickness strain and enhance the room temperature formability of Mg alloy sheet. 展开更多
关键词 Mg alloy Orientation control Microstructural evolution Texture Stretch formability
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Microstructural evolution of AZ61 magnesium alloy predeformed by ECAE during semisolid isothermal treatment 认领 引用 被引量：22
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作者 姜巨福 林鑫 +2 位作者 王迎 曲建俊 罗守靖 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第3期555-563,共9页
The microstructural evolution of AZ61 magnesium alloy predeformed by equal channel angular extrusion（ECAE） during semisolid isothermal treatment（SSIT） was investigated by means of optical metalloscopy and image an... The microstructural evolution of AZ61 magnesium alloy predeformed by equal channel angular extrusion（ECAE） during semisolid isothermal treatment（SSIT） was investigated by means of optical metalloscopy and image analysis equipment.The process involved application of ECAE to as-cast alloy at 310 ℃ to induce strain prior to heating in the semisolid region for different time lengths.The results show that extrusion pass,isothermal temperature and processing route have an influence on microstructural evolution of predeformed AZ61 magnesium alloy during SSIT.With the increase of extrusion pass,the solid particle size is reduced gradually.When isothermal temperature increases from 530 ℃ to 560 ℃,the average particle size increases from 22 μm to 35 μm.When isothermal temperature is 575 ℃,the average particle size decreases.The particle size of microstructure of AZ61 magnesium alloy predeformed by ECAE at BC during SSIT is the finest. 展开更多
关键词 AZ61 magnesium alloy semisolid isothermal treatment equal channel angular extrusion microstructural evolution
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Microstructural evolution of Mg, Ag and Zn micro-alloyed Al-Cu-Li alloy during homogenization 认领 引用 被引量：16
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作者 刘晴 朱瑞华 +4 位作者 李劲风 陈永来 张绪虎 张龙 郑子樵 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第3期607-619,共13页
The microstructural evolution of a Mg, Ag and Zn micro-alloyed Al?3.8Cu?1.28Li (mass fraction, %) alloy ingot during two-step homogenization was examined in detail by optical microscopy (OM), differential scanning cal... The microstructural evolution of a Mg, Ag and Zn micro-alloyed Al?3.8Cu?1.28Li (mass fraction, %) alloy ingot during two-step homogenization was examined in detail by optical microscopy (OM), differential scanning calorimetry (DSC), electron probe micro-analysis (EPMA) and X-ray diffraction (XRD) methods. The results show that severe dendritic segregation exists in the as-cast ingot. There are many secondary phases, includingTB(Al7Cu4Li),θ(Al2Cu),R(Al5CuLi3) andS(Al2CuMg) phases, and a small amount of (Mg+Ag+Zn)-containing and AlCuFeMn phases. The fractions of intermetallic phases decrease sharply after 2 h of second-step homogenization. By prolonging the second-step homogenization time, theTB,θ,R,S and (Mg+Ag+Zn)-containing phases completely dissolve into the matrix. The dendritic segregation is eliminated, and the homogenization kinetics can be described by a constitutive equation in exponential function. However, it seems that the AlCuFeMn phase is separated into Al7Cu2Fe and AlCuMn phases, and the size of Al7Cu2Fe phase exhibits nearly no change when the second-step homogenization time is longer than 2 h. 展开更多
关键词 Al-Cu-Li alloy homogenization microstructural evolution Al_7Cu_2Fe AlCuMn
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Effect of solution treatment and aging on microstructural evolution and mechanical behavior of NiTi shape memory alloy 认领 引用 被引量：13
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作者 江树勇 赵亚楠 +2 位作者 张艳秋 胡励 梁玉龙 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第12期3658-3667,共10页
As-received nickel-titanium （NiTi） shape memory alloy with a nominal composition of Ni50.9Ti49.1 （mole fraction,%） was subjected to solution treatment at 1123 K for 2 h and subsequent aging for 2 h at 573 K, 723 K... As-received nickel-titanium （NiTi） shape memory alloy with a nominal composition of Ni50.9Ti49.1 （mole fraction,%） was subjected to solution treatment at 1123 K for 2 h and subsequent aging for 2 h at 573 K, 723 K and 873 K, respectively. The influence of solution treatment and aging on microstructural evolution and mechanical behavior of NiTi alloy was systematically investigated by transmission electron microscopy （TEM）, high resolution transmission electron microscopy （HRTEM）, scanning electron microscopy （SEM） and compression test. Solution treatment contributes to eliminating the Ti2Ni phase in the as-received NiTi sample, in which the TiC phase is unable to be removed. Solution treatment leads to ordered domain of atomic arrangement in NiTi alloy. In all the aged NiTi samples, the Ni4Ti3 precipitates, the R phase and the B2 austenite coexist in the NiTi matrix at room temperature, while the martensitic twins can be observed in the NiTi samples aged at 873 K. In the NiTi samples aged at 573 and 723 K, the fine and dense Ni4Ti3 precipitates distribute uniformly in the NiTi matrix, and thus they are coherent with the B2 matrix. However, in the NiTi sample aged at 873 K, the Ni4Ti3 precipitates exhibit the very inhomogeneous size, and they are coherent, semi-coherent and incoherent with the B2 matrix. In the case of aging at 723 K, the NiTi sample exhibits the maximum yield strength, where the fine and homogeneous Ni4Ti3 precipitates act as the effective obstacles against the dislocation motion, which results in the maximum critical resolved shear stress for dislocation slip. 展开更多
关键词 NiTi alloy shape memory alloy microstructural evolution mechanical properties solution treatment aging
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Microstructural evolution of new type Al-Zn-Mg-Cu alloy with Er and Zr additions during homogenization 认领 引用 被引量：18
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作者 Hao WU Sheng-ping WEN +4 位作者 Jun-tai LU Zhen-peng MI Xian-long ZENG Hui HUANG Zuo-ren NIE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第7期1476-1482,共7页
A comprehensive study on the microstructural evolution of a new type Al-Zn-Mg-Cu-Er-Zr alloy duringhomogenization was conducted by optical microscope,scanning electron microscope,transmission electron microscopy and X... A comprehensive study on the microstructural evolution of a new type Al-Zn-Mg-Cu-Er-Zr alloy duringhomogenization was conducted by optical microscope,scanning electron microscope,transmission electron microscopy and X-raydiffraction analysis.The results show that serious segregation exists in as-cast alloy,and the primary phases are T(AlZnMgCu),S(Al2CuMg)and Al8Cu4Er,which preferentially locate in the grain boundary regions.The soluble T(AlZnMgCu)and S(Al2CuMg)phases dissolve into the matrix gradually during single-stage homogenized at465°C with prolonging holding time,but the residualAl8Cu4Er phase cannot dissolve completely.Compared with the single-stage homogenization,both a finer particle size and a highervolume fraction of L12-structured Al3(Er,Zr)dispersoids can be obtained in the two-stage homogenization process.A suitablehomogenization scheme for the present alloy is(400°C,10h)+(465°C,24h),which is consistent with the results of homogenizationkinetic analysis. 展开更多
关键词 Al-Zn-Mg-Cu-Er-Zr alloy homogenization microstructural evolution primary phases Al3(Er,Zr) particles
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Microstructural evolution and mechanical properties of forgedβ-solidifiedγ-TiAl alloy by different heat treatments 认领 引用 被引量：13
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作者 Xiao-bing LI Hao XU +4 位作者 Wei-wei XING Bo CHEN Lei SHU Meng-shu ZHANG Kui LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第7期2229-2242,共14页
The microstructural evolution and tensile properties of a forged Ti−42Al−5Mn alloy subjected to different heat treatments were studied.The results showed that,when the forged alloy was aged at 800℃ for 24 h,the inter... The microstructural evolution and tensile properties of a forged Ti−42Al−5Mn alloy subjected to different heat treatments were studied.The results showed that,when the forged alloy was aged at 800℃ for 24 h,the interlamellar spacing(λ)andγgrain size at colony boundaries are generally coarsened.Whereas,when the alloy was first annealed at 1300℃ and then aged at 800℃ for 24 h,this coarsening of related microstructures appears less pronounced.The suggested annealing temperatures for the forged Ti−42Al−5Mn alloy are in the range of 1250−1300℃.It was found that,on the condition of the same annealing system,both the strength and ductility were improved as the aging temperature changed from 1000 to 800℃.The secondary precipitatedβo(βo,sec)at colony boundaries could be responsible for improving the strength,and theγphase at colony boundaries with the grain size about 6μm might be one of the main reasons for the better ductility. 展开更多
关键词 β-solidifyingγ-TiAl alloy forge heat treatment microstructural evolution mechanical properties
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