AZ31镁合金热轧变形的动态再结晶机制  

DRX Mechanism of AZ31 Magnesium Alloy during Hot Rolling

作　　者：付雪松[1] 陈国清[1] 王中奇[1] 周文龙[1] 

机构地区：[1]大连理工大学,辽宁大连116085

出　　处：《稀有金属材料与工程》2011年第8期1473-1477,共5页Rare Metal Materials and Engineering

基　　金：总装"十一五"预研项目及教育部科学技术重点研究项目(106055)

摘　　要：在轧制温度603～703K、轧制压下量20%～40%、应变速率4～16s-1下对AZ31镁合金进行轧制变形,研究轧制压下量、应变速率和变形温度对AZ31镁合金变形组织的影响,分析了镁合金的动态再结晶机制。结果表明:应变速率和变形温度不仅影响动态再结晶进行的程度,而且能够改变再结晶的方式或形核机制。当轧制应变速率ε=13.9s-1,变形温度T=603K时,再结晶方式为孪生动态再结晶;变形温度升高到703K时,沿晶界有链状新晶粒出现。当变形温度T=673K,应变速率ε=11.35s-1时,再结晶方式以孪生动态再结晶为主;应变速率降低到ε=4s-1时,再结晶方式以旋转动态再结晶为主。AZ31 Mg alloy was rolled at the temperature ranging from 603 K to 703 K with reduction from 20% to 40% and strain rate from 4 s-1 to 16 s-1.The effect of reduction per pass,strain rate and rolling temperature on the microstructure of the deformed Mg alloy was studied.The dynamic recrystallization （DRX） mechanism of AZ31 Mg alloy during hot rolling was investigated.The results demonstrate that the strain rate and the temperature not only affect the extent of DRX,but also change the mode of DRX or nucleation mechanism.When the strain rate is ε= 13.9 s-1,the DRX mode is twinning-induced DRX at T=603 K;but there appear some new chain-like grains along the original grain boundaries at T=703 K.When the temperature is T= 673 K,DRX is mainly twinning-induced DRX at the strain rate ε= 11.35 s-1,while with the strain rate decreasing to ε= 4 s-1,the DRX mode turns into rotation DRX.

关 键 词：AZ31镁合金 轧制 动态再结晶 形核机制 

分 类 号：TG335.11[金属学及工艺—金属压力加工]