AZ80合金初始晶粒对其流变应力影响的研究  

Influence of grain size on hot working stresses in AZ80 Mg alloy

作　　者：李保成[1] 王强[1] 张治民[1] 

机构地区：[1]中北大学材料科学与工程学院,太原030051

出　　处：《塑性工程学报》2008年第1期88-91,共4页Journal of Plasticity Engineering

基　　金：山西省青年科学基金资助项目(20051022)

摘　　要：在Gleeble-3800热模拟机上分别对铸态和预变形态AZ80合金进行了等温压缩,研究了初始晶粒对其流变应力的影响。结果表明,相同条件下,初始晶粒细小的预变形态AZ80合金,其峰值流变应力比铸态合金可降低20%左右,同时变形后的组织也较细密;随着变形量(真实应变)的增大,晶粒尺寸对流变应力的影响减弱。在此基础上,提出了铸态镁合金预变形省力成形方法,为降低镁合金成形力提供了新的思路。Specimens of as-cast and pre-strained AZ80 magnesium alloys were deformed respectively in compression on Gleeble- 3800 to investigate the influence of grain size on hot working stresses in AZ80 Mg alloy. The experimental results showed that the form of the stress-strain curves is very sensitive to the initial grain size except the temperature and strain rate. At the same deformation conditions, the peak flow stresses of pre-strained alloy with finer grain are lower 20% than those of as-cast alloy, i. e the flow stress increases with increasing grain size. The microstructure obtained from the pre-strained alloy is finer than those of as-cast alloy. This effect of grain size on flow stress reduces with increasing strain. The method of as-cast billet predeformation was put forward to decrease forming force according to the above results.

关 键 词：AZ80 晶粒尺寸 流变应力 微观组织 

分 类 号：TG115.53[金属学及工艺—物理冶金]