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Microstructure evolution and mechanical properties of Mg−Gd−Zn alloy with and without LPSO phase processed by multi-directional forging 认领 引用 被引量：4
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作者 Jing-yi HUANG Yao-ling LIU +3 位作者 Yu-xiang HAN Ying-chun WAN Chu-ming LIU Zhi-yong CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第4期1075-1091,共17页
The homogenized Mg−5.6Gd−0.8Zn(wt.%)alloys were treated with water cooling and furnace cooling to obtain specimens without and with the 14H long-period stacking ordered(LPSO)phase.Subsequently,multi-directional forgin... The homogenized Mg−5.6Gd−0.8Zn(wt.%)alloys were treated with water cooling and furnace cooling to obtain specimens without and with the 14H long-period stacking ordered(LPSO)phase.Subsequently,multi-directional forging(MDF)experiments were carried out.The microstructure and mechanical properties of different regions(the center,middle and edge regions)in the MDFed alloys were systematically investigated,and the effect of LPSO phase on them was discussed.The results show that the alloys in different regions undergo significant grain refinement during the MDF process.Inhomogeneous microstructures with different degrees of dynamic recrystallization(DRX)are formed,resulting in microhardness heterogeneity.The alloy with the LPSO phase has higher microstructure homogeneity,a higher degree of recrystallization,and better comprehensive mechanical properties than the alloy without the LPSO phase.The furnace-cooled alloy after 18 passes of MDF has the best comprehensive mechanical properties,with an ultimate compressive strength of 488 MPa,yield strength of 258 MPa,and fracture strain of 21.2%.DRX behavior is closely related to the LPSO phase and deformation temperature.The kinked LPSO phase can act as a potential nucleation site for DRX grains,while the fragmented LPSO phase promotes DRX nucleation through the particle-stimulated nucleation mechanism. 展开更多
关键词 Mg−Gd−Zn alloy multi-directional forging LPSO phase twinning kink dynamic recrystallization
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Microstructure and mechanical properties of aged Mg-Gd-Y-Zr-Ag alloy sheets processed by different rolling routes 认领 引用
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作者 ZHU Yu-ting CHEN Han +5 位作者 CHEN Zhi-yong HAN Yu-xiang JIANG Shu-nong GAO Yong-hao WAN Ying-chun LIU Chu-ming 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第8期2809-2822,共14页
Microstructure and mechanical properties of aged Mg-10Gd-2Y-0.4Zr-0.4Ag alloy sheets prepared by different rolling routes were investigated.The results showed that the cross rolling aged(CRA)sheet possesses larger gra... Microstructure and mechanical properties of aged Mg-10Gd-2Y-0.4Zr-0.4Ag alloy sheets prepared by different rolling routes were investigated.The results showed that the cross rolling aged(CRA)sheet possesses larger grain size than unidirectional rolling aged(URA)sheet due to the occurrence of dynamic recovery during rolling which reduces the dislocation density and delays dynamic recrystallization(DRX).The URA sheet has basal texture and RD favored texture while CRA sheet has multiple-peak texture.Both sheets precipitate β'phase and CRA sheet exhibits a stronger aging response.The CRA sheet has higher yield strength and tensile strength than URA sheet,with reduced yield strength anisotropy but increased tensile strength anisotropy.Taking into account different strengthening mechanisms,although the finer grain size of URA sheet enhances grain boundary strengthening,CRA sheet is more responsive to aging,leading to superior aging-precipitated phase strengthening and consequently higher yield strength. 展开更多
关键词 Mg-Gd-Y-Zr-Ag alloy rolling routes aging precipitation microstructure strengthening mechanism
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