AZ31B镁合金高温拉伸变形行为的研究  

Tensile deformation behavior of magnesium alloy AZ31B at high temperature

作　　者：王孟君[1,2] 姜海涛[1] 任杰[1] 黄电源[1] 武星星[1] 

机构地区：[1]中南大学有色金属材料科学与工程教育部重点实验室,湖南长沙410083 [2]材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《金属热处理》2008年第11期44-47,共4页Heat Treatment of Metals

基　　金：材料成形与模具技术国家重点实验室开放基金

摘　　要：通过高温拉伸试验，研究了AZ31B镁合金板材在250～450℃以及应变速率0．001s^-1、0．01s^-1条件下的高温变形行为，获得了材料的厚向异性系数、伸长率等成形性能参数及有关组织特征。结果表明，不同变形条件下AZ31B合金的真应力．真应变曲线均出现峰值，峰值应力随变形温度的升高和应变速率的降低而减小；硬化速率随变形温度的升高而降低，在温度高于250℃时变化不大。当变形温度为250℃，应变速率为0．001s^-1时，合金的厚向异性系数达到最大。随变形温度的升高，AZ31B镁合金的塑性显著提高。合金的动态再结晶温度为250℃，随着应变速率增大，合金发生动态再结晶的速度加快。The high temperature deformation behavior of AZ31 B magnesium alloy slab was researched by tensile test under strain rates 0. 001 s^-1 and 0. 01 s^-1 at temperature ranging from 250 to 450 ℃. Microstructure characteristic and forming performance parameter of the alloy such as normal anisotropy coefficient and elongation were obtained. The results show that there are peaks on all of the true stress-strain curves at different deformation conditions. The peak stress decreases with increasing the deformation temperature and decreasing the strain rate. The hardening rate decreases with increasing the deformation temperature. However, the hardening rate has little change when the deformation temperature is above 250 ℃. The normal anisotropy reaches the maximum when the temperature is 250 ℃ and the strain rate is 0. 001 s^-1. The elongation of the AZ31B magnesium alloy increase remarkably with increasing the deformation temperatures. Under dynamic recrystallization temperature of 250℃, the dynamic recrystallization speed accelerates with the increase of the strain rate.

关 键 词：AZ31B镁合金 高温变形 动态再结晶 成形性能 

分 类 号：TG146[一般工业技术—材料科学与工程]