(重慶大學(xué) 材料科學(xué)與工程學(xué)院， 重慶 400044)
摘 要: 利用Gleeble-1500D熱模擬機(jī)， 對AZ31鎂合金在300-450℃以及應(yīng)變速率為0.1 和1.0s-1條件下進(jìn)行了熱壓縮。發(fā)現(xiàn)在熱壓縮變形過程中發(fā)生了動態(tài)再結(jié)晶， 其動態(tài)再結(jié)晶平均晶粒尺寸（d）的自然對數(shù)與Zener-Hollomon參數(shù)（Z）的自然對數(shù)成線性關(guān)系。 再利用d與Z的關(guān)系， 通過較低的熱擠壓溫度（300-350℃）， 獲得了動態(tài)再結(jié)晶晶粒直徑在10-20μm之內(nèi)的鎂合金管材。
關(guān)鍵字: 鎂合金；動態(tài)再結(jié)晶； 晶粒細(xì)化
magnesium alloy
FAN Yong-ge, HUANG Guang-jie
（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
