(重庆大学 材料科学与工程学院， 重庆 400044)
摘 要: 利用Gleeble-1500D热模拟机， 对AZ31镁合金在300-450℃以及应变速率为0.1 和1.0s-1条件下进行了热压缩。发现在热压缩变形过程中发生了动态再结晶， 其动态再结晶平均晶粒尺寸（d）的自然对数与Zener-Hollomon参数（Z）的自然对数成线性关系。 再利用d与Z的关系， 通过较低的热挤压温度（300-350℃）， 获得了动态再结晶晶粒直径在10-20μm之内的镁合金管材。
关键字: 镁合金；动态再结晶； 晶粒细化
magnesium alloy
（College of Materials Science and Engineering,
Chongqing University, Chongqing 400044, China）
Abstract:The hot compression behaviors of AZ31magnesium alloy at 300-450℃, with strain rate of 0.1-1.0s-1 were investigated by means of isothermal compression test at Gleeble-1500D thermal mechanical simulator. Dynamic recrystallization takes place during the deformation process. The natural logarithm of dynamic recrystallization grains size(d) is linear with the natural logarithm of Zener-Hollomon parameter(Z). The fine grain microstructure of extruded AZ31 magnesium alloy between 10 and 20μm are observed at the lower deformation temperature of 300-350℃ by means of the relationship between d and Z parameter.
Key words: magnesium alloy; dynamic recrystallization; grain refi
