等通道转角挤压后AZ31镁合金的微观结构与性能

Microstructure and Properties of AZ31 Magnesium Alloy with ECAP

为了进一步探讨细晶镁合金的制备方法与性能 ,采用模角φ =12 0°的模具、以BC路径对AZ31镁合金进行了等通道转角挤压试验研究 ,对挤压过程中各道次试样的微观结构及性能进行了分析测试 .结果表明 ,随着挤压道次的增加 ,晶粒得到不断细化 ,力学性能也发生显著的变化 ;当挤压 12道次时 ,总的等效应变量约为 8,晶粒得到显著细化 ,晶粒尺寸为 1～ 5μm ,但合金的抗拉强度变化不大 ,屈服强度则有所下降 ,约为 10 0MPa ,延伸率则提高到 4 5

In order to further investigate the preparation and property of ultra-grained magnesium alloy, AZ31 magnesium alloy was prepared by means of equal-channel angular pressing (ECAP) and B c route in the die with the intersecting angle φ =120°. The microstructure and property of the processed material with different passes were then analyzed and tested. The results indicate that, with the increase in the pressing pass, the grains become finer and finer and the tensile behavior changes remarkably, that with 12 pressing passes, the total deformation strain of the alloy is about 8 and the grains are effectively refined to a mean size of 1～5μm, and that the tensile strength of the alloy changes little, while the yield strength decreases to about 100MPa, and the ductility increases to more than 45%.