5356铝合金的高温热变形研究  

Study on High Temperature Thermal Deformation of 5356 Aluminum Alloy

作　　者：周天国 柯长奋 ZHOU Tianguo;KE Changfen(College of Materials Science and Engineering,Yangtze Normal University,Chongqing 408100,China;Jiangsu He Tuo Aluminum Wire.,Ltd.,Lianyungang 213000,China)

机构地区：[1]长江师范学院材料科学与工程学院,重庆408100 [2]江苏和拓铝线有限公司,江苏连云港213000

出　　处：《热加工工艺》2021年第24期47-51,共5页Hot Working Technology

基　　金：重庆市教育委员会科学技术研究项目(KJZD-M201801401);长江师范学院引进人才科研启动项目(2018KYQD006)。

摘　　要：采用Gleeb1e-3500热模拟试验机对5356铝合金进行了变形温度分别为300~500℃、应变速率为0.01~10 s^(-1)的热压缩变形试验,建立了合金高温变形的本构方程。结果表明:5356铝合金的流变应力随变形温度的升高而降低,随着应变速率的增加而升高。当应变速率小于等于1 s^(-1),5356铝合金呈现出动态回复特征;当应变速率为10 s^(-1),呈现出不连续动态再结晶特征。同时5356铝合金显示为较强的变形温度与应变速度敏感性,并具有较高的高温强度。该合金热压缩流变应力可用包含Zener-Hollomon参数的双曲线正弦关系来描述,本构方程计算峰值应力与实测峰值应力高度一致,因此,该方程可用于铝合金焊丝连轧工艺与设备的设计。The hot compression deformation of 5356 aluminum alloy was performed in the deformation temperature of 300-500℃and the strain rate of 0.01-10 s^(-1) by using Gleeb1e-3500 thermal mechanical simulator,high temperature deformation constitutive equations were established.The results show that the flow stress of 5356 aluminum alloy decreases with the increase of the deformation temperature,increases with the increase of strain rate.As the strain rate is lower or more than 1s^(-1),the dynamic recovery exhibits in 5356 aluminum alloy,and the strain rate is 10 s^(-1),a discontinuous dynamic recrystallization occurs.Meanwhile,5356 aluminum alloy exhibits strong deformation temperature and strain speed sensitivity with high temperature strength compared with the pure aluminum.The hot deformation flow stress of the alloy can be described by using hyperbolic sine equation including Zener-Hollomon parameter.The peak stress calculated by using the constitutive equation established is well competent in the stress measured,so the equations can be used in the design of continuous rolling process and equipment for manufacturing aluminum alloy welding rod.

关 键 词：5356铝合金 热压缩变形 流变应力 应变速率 本构方程 

分 类 号：TG146.2[一般工业技术—材料科学与工程]