铸态AZ80+0.4Ce镁合金的热压缩变形试验研究  

Hot compression deformation behaviors of as-cast AZ80+0.4Ce magnesium alloy at elevated temperature

作　　者：王博博[1] 方敏[1] 杨勇彪[1] 王强[1] WANG Bo-bo FANG Min YANG Yong-biao WANG Qiang(College of Material Science and Engineering, North University of China, Talyuan 030051, China)

机构地区：[1]中北大学材料科学与工程学院,山西太原030051

出　　处：《轻合金加工技术》2016年第12期45-49,共5页Light Alloy Fabrication Technology

基　　金：新世纪优秀人才支持计划(NCET-13-1001)

摘　　要：采用Gleeble-3500热模拟试验机，在变形温度300℃～420℃、应变速率0．0005s～-0．5s^-1的变形条件下，对铸态AZ80＋0．4Ce镁合金进行热压缩试验。试验研究了该合金的高温流动应力变化规律，采用金相显微镜分析了温度、应变速率对微观组织的影响。结果表明：铸态AZ80＋0．4Ce镁合金的高温流动应力-应变曲线主要以动态再结晶软化机制为特征，增加变形温度和降低应变速率都会降低材料的流动应力；热压缩温度越高，动态再结晶进行越充分，应变速率越大，动态再结晶晶粒越细。The hot compression test of as-cast AZ80 ＋0.4Ce magnesium alloy was conducted on a Gleeble-3500 thermo-mechanical simulator in the temperature range of 300 -420℃ and the strain rate range of 0. 000 5 s -1 - 0. 5 s - 1. The elevated temperature flow stress of the alloy was studied and the influence of temperature and strain rate on the microstructure was analyzed by means of the optical microscopy. The results show that the high temperature flow stress-strain curve of as-cast AZ80 ＋ 0.4Ce magnesium alloy is mainly characterized by dynamic recrystallization Softening mechanism and that the flow stress of the alloy decreases with increasing temperature and decreasing strain rate. The dynamic recrystallization tends to be more complete with increasing temperature and the dynamic recrystallized grain size de- creases with increasing strain rate.

关 键 词：铸态AZ80+0.4Ce镁合金 热压缩 流动应力 微观组织 

分 类 号：TG146.22[一般工业技术—材料科学与工程]