塑性变形对铸态AZ31镁合金组织和性能的影响

Influence of Plastic Deformation on Microstructure and Mechanical Properties of As-cast AZ31 Magnesium Alloy

为了研究塑性变形对铸态镁合金组织和性能的改善作用,用铸态AZ31镁合金进行了等温压缩实验,并测试了原始试样和变形后试样的组织和性能。结果表明:铸态AZ31合金通过塑性变形可以显著细化晶粒;随变形温度的升高,变形所得试样抗拉强度下降;在同一温度下变形所得试样抗拉强度随变形程度的增加而升高,变形程度达到一定值后,抗拉强度不再升高并有下降的趋势;铸态AZ31合金低温变形(210～240℃)后,可大幅度提高其抗拉强度。

In order to study the effect of plastic deformation on microstructure and mechanical properties of as-cast magnesium alloy, the isothermal compression experiment of as-cast AZ31 magnesium alloy was done. The microstructure and mechanical properties of original samples and deformed samples were investigated. Experimental results show that the grain size of as-cast AZ31 alloy can be dramatically refined by plastic deformation. When the deformation temperature increases, the tensile strength of deformed sample will fall. When temperature is same, the tensile strength of deformed sample will increase as increasing deformation, but it will not increase and will fall when the deformation exceeds a certain value. The tensile strength of the as-cast AZ31 alloy will dramatically increase by deformation at low temperature (210-240°C).