摘要
The effects of strain rate on the mechanical properties,microstructure and texture of Al-Mg-Si-Cu alloy were investigated through tensile test,microstructure and texture characterization.The results show that strain rate has some influences on the mechanical properties and microstructure,but a slight influence on the texture.Overall,yield strength,ultimate tensile strength and elongation increase first,then remain unchanged,and finally increase with increasing strain rate.Independent of strain rate,microstructure in the vicinities of the fracture regions of all the specimens is composed of the slightly elongated grains.However,some differences in misorientation angle distributions can be observed.As strain rate increases,the low angle grain boundaries(LAGBs)increase first,and then decrease.Textures in the vicinities of the fracture regions are almost identical with increasing strain rate.
通过拉伸测试、显微组织和织构表征研究应变速率对Al-Mg-Si-Cu合金力学性能、显微组织及织构的影响。结果表明,应变速率对力学性能和显微组织有一定的影响,但对织构几乎无影响。总的来说,随着应变速率的增加,合金的屈服强度、极限抗拉强度及伸长率均呈先增加、然后保持不变、最后增加的趋势。所有合金断口附近区域的显微组织与应变速率无关,均由轻微拉长的晶粒组成,但晶界角度分布存在一定差异;随着应变速率的增加,小角度晶界先增加后减少。应变速率的变化对断口附近区域的织构几乎无影响。
基金
Project(TZ2018001)supported by the Science Challenge Project,China
Project(LQ17E010001)supported by the Zhejiang Provincial Natural Science Foundation,China
Project(2019-Z02)supported by the State Key Lab of Advanced Metals and Materials,China
Project(2018A610174)supported by the Ningbo Natural Science Foundation,China
Project supported by K.C.Wong Magna Fund from Ningbo University,China.
