基于纳米压入法AZ31轧制镁合金的蠕变行为研究  

Creep Behavior of AZ31 Rolled Magnesium Alloy Based on Nanoindentation

作　　者：王在 茹婷婷 Wang Zai;Ru Tingting(School of Applied Science,Taiyuan University of Science and Technology;Shanxi Provincial General Hospital of Chinese People's Armed Police Force)

机构地区：[1]太原科技大学应用科学学院 [2]中国人民武装警察部队山西省总队医院

出　　处：《特种铸造及有色合金》2023年第2期241-244,共4页Special Casting & Nonferrous Alloys

基　　金：山西省高等学校科技创新项目(2021L327);大原科技大学科研启动支持项目(20212037)。

摘　　要：采用纳米压入法对AZ31轧制镁合金蠕变性能的各向异性行为进行了研究。采用连续刚度测试原理对沿轧制方向0°、30°、45°、60°以及90°的AZ31轧制镁合金板材进行纳米压入试验,基于Nix-Gao理论获得材料去除尺度效应的不同取向硬度值,并对材料5个方向的保载阶段蠕变行为的各向异性进行分析。结果表明,与宏观拉伸-压缩试验结果相似,基于纳米压入得到的不同取向AZ31轧制镁合金硬度值表现出明显的各向异性,蠕变应力指数沿着轧制方向的角度增大呈现增大趋势,0°和30°的蠕变应力指数分别为1.5和1.4,此时蠕变机理为扩散蠕变和晶界滑移协调作用。45°、60°和90°取向的蠕变应力指数分别为2.1、2.0和2.2,这3个取向的蠕变过程为晶界滑移为主导。The anisotropic creep properties of rolled AZ31 magnesium alloy were investigated by micro-nanoindentation method. Nanoindentation test of AZ31 alloy with different orientations(0°,30°,45°,60° and 90° along rolled direction) by continuous stiffness mode was carried out. The hardness independent of the effect of indentation depth was obtained based on the Nix-Gao mode, and creep displacements in the load retaining phase were analyzed for different orientations of the material. The results reveal that the hardness and creep mechanism of the indentation retention stage of AZ31 rolled magnesium alloys by Nanoindentation test with different orientations exhibit significant anisotropy. Creep stress index shows an increasing trend with increasing in angle along the rolled direction. The creep stress indexes for 0° and 30° are 1.5 and 1.4, respectively, where the creep mechanism is characterized by the coordinated effect of diffusion creep and grain boundary slip. The 45°, 60° and 90° orientations have creep stress indexes of 2.1, 2.0 and 2.2, respectively, where the creep process in these three orientations is dominated by grain boundary slip.

关 键 词：AZ31 纳米压入 各向异性 蠕变 应力指数 

分 类 号：TG146.22[一般工业技术—材料科学与工程]