焊丝用Al-6.3Mg合金热变形行为及本构方程  

Hot deformation behavior and constitutive equations of Al-6.3Mg alloys for welding wire

作　　者：徐光帅 廖斌 苏丽萍 陶荟宇 李飞龙 XU Guangshuai;LIAO Bin;SU Liping;TAO Huiyu;LI Feilong(Alnan Aluminium Co.,Ltd.,Nanning 530200,Guangxi,China;Guangxi Guochao Aluminum Co.,Ltd.,Nanning 530200,Guangxi,China;Guangxi Transport Vocational and Technical College,Nanning 530216,Guangxi,China)

机构地区：[1]南南铝业股份有限公司,广西南宁530200 [2]广西国潮铝业有限公司,广西南宁530200 [3]广西交通职业技术学院,广西南宁530216

出　　处：《金属功能材料》2025年第1期69-75,共7页Metallic Functional Materials

基　　金：南宁市邕江计划领军人才团队专项(2024004);南宁市科学研究与技术开发计划(20241024)。

摘　　要：采用Gleeble-3500热模拟试验机在变形温度为400~450℃和应变速率为0.0002~0.002 s^(-1)条件下对Al-6.3Mg合金进行了等温压缩试验,得到了不同应变速率和温度下的真应力-真应变曲线。结果表明:合金真应力随变形温度增加和应变速率的降低而逐渐下降。该合金热变形流变应力可以用包含Z参数关系式进行描述,通过计算得到热激活能为133.571 kJ/mol,获得最佳热变形参数为425~450℃,应变速率为0.001~0.0014 s^(-1)。通过正向挤压试验表明通过热加工图所获得的加工参数可有效指导挤压工艺制定。Hot compression experiments were carried out on Al-6.3Mg alloy using Gleeble-3500 thermal simulation tester at deformation temperatures of 400-450℃and strain rates of 0.0002-0.002 s^(-1).The true stress and true strain curves were obtained at different strain rates and temperatures.The results show that the true stress of the alloy decreases gradually with the increase of deformation temperature and the decrease of strain rate.The thermal deformation flow stress of this alloy can be described by the Z parameter relationship equation.Thermal activation energy is calculated to be 133.571 kJ/mol.Optimum thermal deformation parameters are obtained,the optimum thermal deformation parameter is obtained to be 425-450℃and the strain rate is 0.001-0.0014 s^(-1).Extrusion tests have shown that the processing parameters obtained from thermal processing diagrams can effectively guide the extrusion process.

关 键 词：AL-MG合金 流变应力 本构方程 热加工图 

分 类 号：TG1[金属学及工艺—金属学]