【摘要】 采用真空感应熔炼技术制备Mg-5.5Li-3.0Al-1.2Zn-1.0Ce合金。对合金进行挤压和挤压后轧制变形,研究变形过程中合金的组织及性能的变化特点。结果表明,合金在523K下进行挤压变形时发生了动态再结晶,得到均匀的等轴晶组织,变形方式有棱柱面滑移、锥面滑移和基面滑移。挤压后再温轧变形有大量的孪晶生成,形成了典型的(0002)基面板织构,变形方式主要以基面滑移和锥面孪生为主。挤压变形后合金抗拉强度、屈服强度、延伸率都得到提高,挤压后再轧制变形合金强度和硬度进一步提高,延伸率下降。更多还原

【Abstract】 Mg-5.5Li-3.0Al-1.2Zn-1.0Ce alloys were prepared with a vacuum induction melting method. After the extrusion plus rolling processes of alloys, the deformation behavior of alloys shows that, when the extrusion temperature reaches 523 K, the dynamic recrystallization takes place to obtain the fine equiaxed grains. After the extrusion plus rolling processes, many twin grains are found in microstructure; the deformation includes the prismatic slipping, pyramidal slipping and basal slipping. Deformation process causes the more obvious (0002) basal face texture in alloys, and the deformation modes are mainly basal slipping and twinning. After the extrusion, the mechanical properties, including UTS, YS and elongation, of the alloy are improved. However, after extrusion plus rolling, the wrought alloy has further-increased strength and hardness, but a declined elongation.更多还原