一种新型铝锰合金的热压缩流变行为及热加工图  

Hot Compression Flow Stress Behavior and Thermal Processing Map of a New Al-Mn Alloy

作　　者：王学印[1] 李雪峰[2] 蒋福林[2] 张辉[2] 

机构地区：[1]金龙精密铜管集团股份有限公司,新乡453000 [2]湖南大学材料科学与工程学院,长沙410082

出　　处：《机械工程材料》2014年第11期90-94,共5页Materials For Mechanical Engineering

摘　　要：采用Gleeble-3500型热模拟试验机对一种新型铝锰合金进行了应变速率为0.01~10s-1、变形温度为350~550℃的等温热压缩试验,研究了它的热压缩流变行为;基于动态材料模型获得了该合金的热加工图,并研究了其显微组织与变形温度、应变速率之间的关系。结果表明：试验合金的热压缩流变行为可用双曲正弦模型来描述,其激活能为194.757kJ·mol-1;结合热加工图和显微组织得到的试验合金适宜的加工温度和应变速率分别为500~550℃和0.1s-1;在高Z条件下的亚晶为拉长的变形组织,在低Z条件下则形成了低位错密度的完整亚晶结构。Isothermal compression tests for a new Al-Mn alloy were carried out at the strain rate range of0.01-10s-1 and at temperature of 350-550 ℃ on Gleeble-3500 thermal simulation system,and the flow stress behavior during hot compression was studied.The thermal processing map was obtained by dynamic material model（DMM）,and the relations between microstructure and deformation temperature and strain rate were studied.The results show that the hot compression flow stress behavior of the tested alloy could be described by the hyperbolicsine equation with the average activation energy of 194.757kJ·mol-1.The optimum temperature and strain rate of the tested alloy,which were got by combining thermal processing map and microstructure,were 500-550 ℃ and0.1s-1,respectively.The subgrains were elongated deformed microstructure at high Zvalue and some well-formed subgrains with low density dislocations were formed at lowZvalue.

关 键 词：铝锰合金 热压缩变形 热加工图 显微组织 

分 类 号：TG146.2[一般工业技术—材料科学与工程]