AZ31镁合金板温拉深流变应力行为研究  

Flow stress behavior of AZ31 Magnesium alloy sheet during warm tensile

作　　者：咸奎峰[1] 张辉[1] 陈振华[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《锻压技术》2006年第3期46-49,95,共5页Forging & Stamping Technology

基　　金：湖南省重大专项计划项目(04GK1008-1)

摘　　要：为了建立镁合金板温拉深成形的流变应力数学模型,在温度为200℃～350℃和应变速率为0.001 s^-1～0.1s^-1的条件下,对AZ31镁合金板进行拉伸实验,研究其温拉深流变应力行为.通过对Fields-Backofen方程修正分析,建立了AZ31镁合金板温拉深流变应力数学模型,在峰值应力之前,模型预测值与实测结果相比十分接近.对加入软化因子s的模型进行了计算,与修正的Fields-Backofen相比,更好的模拟了软化阶段的流变应力变化.本文研究的模型可以用于指导镁合金板成形,也为有限元分析流变应力打下基础.For modeling the flow stress of Magnesium alloy sheet during warm forming, warm tensile test with magnesium alloy AZ31 are carried out in a temperature range of 200℃～350℃, strain rate range of 0. 001s^-1～0.1s^-1, flow stress behavior of AZ31 magnesium alloy sheet during warm tensile is studied in this paper. The mathematic model about the flow stress of AZ31 magnesium alloy sheet during tensile test is developed by modifying and analyzing Fields-Backofen equation, the flow stresses calculated by the present formula give a good fit to the measured ones before the peak value of the flow stress. The mathematical model which contains a softening item s is calculated here, compared to the new Fields-Backofen model, this model approaches more closely at the soften state of the flow stress. The mathematic models studied in this paper can be used to guiding the forming of magnesium alloy sheet, and prepare a foundation of finite element analysis of flow stress.

关 键 词：AZ31镁合金 温拉深 流变应力 

分 类 号：TG386[金属学及工艺—金属压力加工]