AZ31-1Sm镁合金高温压缩热变形行为和微观组织研究(英文)  

Hot Deformation Behavior and Microstructure of AZ31-1Sm Alloy Compression at Elevated Temperatures

作　　者：徐静[1] 李朝兴[1] 郑开宏[1] 黄正华[1] 

机构地区：[1]广州有色金属研究院,广东广州510650

出　　处：《稀有金属材料与工程》2014年第11期2572-2575,共4页Rare Metal Materials and Engineering

基　　金：Science and Technology Innovation Platform with Guangdong Provincial Department of Industry-Academy Research(2012B090600051)

摘　　要：在单向压缩热模拟试验机上对AZ31-1Sm合金在变形温度为300～450℃、应变速率为0.01～1 s-1条件下的热变形行为和微观组织进行研究。结果表明：AZ31-1Sm镁合金在热压缩变形时,流变应力随着应变速率的增大和变形温度的降低而增大;该合金的热压缩流变应力行为可用双曲正弦形式的本构方程来描述,在本实验条件下,AZ31-1Sm镁合金热热变形激活能Q为160.8 k J/mol。AZ31-1Sm易发生动态再结晶,在高变形温度和低应变速率条件下动态再结晶趋势明显,动态再结晶晶粒尺寸随着变形温度的增加和应变速率的降低而增大。The hot deformation behavior of AZ31-1Sm alloy and its microstructure evolution were investigated by isothermal axi- symmetric hot compression tests at temperatures ranging from 300 to 450 ℃ and strain rates from 0.01 to 1 s^-1. The results show that the steady flow stress increases with increasing of the strain rate or decreasing of the deformation temperature, which can be de- scribed by a hyperbolic-sine constitutive equation with the deformation activation energy of 160.8 kJ/mol. AZ3 l-lSm alloy is easy to promote the dynamic recrystallization （DRX）. The tendency of the dynamic recrystallization enhances at high deformation tem- peratures and low strain rates. Recrystallization grains size increases with the deformation temperature increasing or strain rate de- creasing.

关 键 词：热变形 微观组织 双曲正弦 本构方程 

分 类 号：TG146.22[一般工业技术—材料科学与工程]