Hot Compression Deformation Behavior and Processing Map of As-cast RE-Mg AZ31 Alloy

Liu Haijun

doi:10.15980/j.tzzz.2017.01.005

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Hot Compression Deformation Behavior and Processing Map of As-cast RE-Mg AZ31 Alloy
Vol. 37, Issue 1, Pages: 15-17(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.01.005

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[1]刘海军.含稀土AZ31镁合金热压缩变形行为及加工图[J].特种铸造及有色合金,2017,37(01):15-17.

Liu Haijun. Hot Compression Deformation Behavior and Processing Map of As-cast RE-Mg AZ31 Alloy. [J]. Special Casting & Nonferrous Alloys 37(1):15-17(2017)
[1]刘海军.含稀土AZ31镁合金热压缩变形行为及加工图[J].特种铸造及有色合金,2017,37(01):15-17. DOI： 10.15980/j.tzzz.2017.01.005.

Liu Haijun. Hot Compression Deformation Behavior and Processing Map of As-cast RE-Mg AZ31 Alloy. [J]. Special Casting & Nonferrous Alloys 37(1):15-17(2017) DOI： 10.15980/j.tzzz.2017.01.005.

摘要

在变形温度为250

00℃和应变速率为0.01

-1

的条件下

采用Gleeble-1500D热模拟试验机对含稀土AZ31镁合金进行等温恒应变速率热压缩试验

获得了其真应力-应变曲线。确定了该合金在稳态应力下的Arrhenius流动应力模型参数

并基于动态材料模型理论（DMM）建立了其热加工图。结果表明

该合金的流动应力随应变速率的升高和温度的降低而增大。结合热加工图和显微组织演化分析

确定其适宜的热成形工艺区域有两个:0.03

.8s

-1

250

25℃和0.01

.9s

-1

350

00℃。

Abstract

The hot compression tests of as-cast RE-Mg AZ31 alloy were conducted at 250

00 ℃ and0.01

-1

by using the Gleeble-1500 D hot-simulator.Then the true stress-strain curves were obtained.The high temperature flow stress constitutive model parameters under steady flow stress were presented.The hot processing maps for the AZ31 alloy were drawn on the basis of dynamic materials model（DMM）.The results show that flow stress is increased with decreasing in temperature and increasing in strain rate.Combined with analysis of hot processing map and microstructure evolution

there exist two optimum hot deformation process areas

including strain rates of 0.03

.8s

-1

at 250

25 ℃ and strain rates of 0.01

.9s

-1

at 350

00 ℃.