【摘要】 本文通过单向轧制和交叉轧制方法制备了两种不同的时效态Mg-10Gd-2Y-0.4Zr-0.4Ag合金，采用光学显微镜、扫描电镜、EBSD、透射电镜及拉伸试验等测试方法探究了轧制路径对合金组织和性能的影响。结果表明：交叉轧制时效态(CRA)板材的晶粒尺寸大于单向轧制时效态(URA)板材，这是因为在轧制过程中发生的动态回复减少了位错密度并延迟了动态再结晶(DRX)的发生。URA板材具有基面织构和偏向RD的织构，而CRA板材则具有多峰织构；两种板材均析出β’相，但CRA板材展现出更强的时效响应。CRA板材相比于URA板材其屈服强度的各向异性减弱，但抗拉强度的各向异性增强。URA板材具有的更细晶粒尺寸增强了晶界强化，但是CRA板材具有更高的屈服强度，因为CRA板材更强的时效析出响应增强了析出强化。更多还原

【Abstract】 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 RDfavored 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.更多还原