中文摘要：

通过光学显微镜（OM）、电子背散射衍射分析技术（EBSD）研究了低温压缩预变形对AZ80镁合金组织及力学性能的影响。结果表明：室温压缩预变形引入孪晶,孪晶密度随着预变形程度增大而增大;预变形程度越大,高温压缩后再结晶体积分数越高。再结晶晶粒尺寸不受预变形的影响。预变形试样比无预变形试样不仅强度略有提升,且塑性提升明显,预变形程度越大,提升效果越明显。预变形15%的试样的屈服强度、抗拉强度及断裂延伸率分别为216 MPa、330 MPa和14.1%,相对于无预变形试样分别提高12.5%、6.5%和33.0%。

英文摘要：

Effects of cold pre-compression on microstructure and mechanical properties of AZ80 Mg alloy were studied through optical microscope（OM） and electronic backscattering diffraction（EBSD） technology. The results show that twins can be induced by pre-compression at ambient temperature. The twin density increases with pre-compression strain, leading to higher fraction of recrystallization in the sample after hot compression. The average size of recrystallized grain is hardly affected by pre-compression strain. Excellent ductility and high strength can be achieved in AZ80 Mg alloy with pre-compression. After pre-compressed to ε = 15%, the yield strength and the ultimate tension strength achieve 216 MPa and 330 MPa, and the fracture elongation reaches 14.1%, which are increased by 12.5%, 6.5% and 33.0%, respectively.