固溶处理对AZ31合金组织与高温力学性能的影响

Effects of Solution Treatment on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy at Elevated Temperature

采用Zeiss金相显微镜、XRD射线衍射仪研究了不同固溶处理条件对AZ31镁合金的组织及性能的影响。结果表明,AZ31合金的抗拉强度随着固溶时间的延长得到明显提高(由688K固溶处理6h的69.7MPa升至12h的86.6MPa);经过688K×12h固溶处理的AZ31合金组织中的β-Mg17Al12相逐渐溶解,最后完全溶入基体中;固溶时间的延长保证了再结晶过程的充分进行,688K固溶处理12h的合金组织晶界处产生了大量平均尺寸为10μm的细小再结晶晶粒。

Influences of solution treatment on microstructure and mechanical properties of AZ31 magnesium alloy were investigated by Zeiss microscope and X-ray diffraction.The results show that the tensile strength of AZ31 magnesium alloy is increased from 69.7 MPa to 86.6 MPa with solid solution treatment at 688K from 6 h to 12 h.The β-Mg17Al12 phase in the microstructure of the AZ31 magnesium is gradually dissolved into the matrix phase after solid solution at 688 K for 12 h.With increasing in the solution time,the static recrystallization in the magnesium alloy can be fully undergone,and a large amount of fine recrystallization grains with the average size of 10 μm are generated at the boundary of the AZ31 magnesium alloy after the solid solution at 688 K for 12 h.