Mg-13Gd-4Y-2Zn-0.5Zr合金的高温热压缩变形  

Hot Compression Deformation Behavior of Mg-13Gd-4Y-2Zn-0.5Zr Magnesium Alloy

作　　者：尹雪雁 于建民[1,2] 张治民[1,2] 齐红娜[1] 郁湘 陈艳[4] YinXueyan Yu Jianmin zhang Zhimin Qi Hongna Yu Xiang Chen Yan(School of Materials Science and Engineering, North University of China Engineering Technology Research Center for Integrated Precision Forming of Shanxi North General Power Group Co. , Ltd. Mechanical Engineering Department of Hunan Chemical Industry Vocation Technology Institute)

机构地区：[1]中北大学材料科学与工程学院 [2]山西省精密成形工程技术研究中心 [3]北方通用动力集团有限公司 [4]湖南化工职业技术学院机械工程系

出　　处：《特种铸造及有色合金》2016年第10期1117-1120,共4页Special Casting & Nonferrous Alloys

摘　　要：采用Gleeble-3500热模拟机对Mg-13Gd-4Y-2Zn-0.5Zr合金进行高温热压缩变形,研究分析了材料的微观组织和流变应力-应变关系曲线并进行线性拟合,建立相应的热变形本构关系,并分析其变形规律。结果表明,变形组织很大程度上继承了铸态均匀化组织的形貌;温度越高,越早达到峰值应力,流变应力值与峰值应力值之间的差值也越小;且稳态应力值随之越小。本构方程为ε·=5.314 5×10^(16)[sinh(0.009 717σ)]^(5.401 38)exp[-253.927/(RT)]。Hot compression deformation test of Mg-13Gd-4Y-2Zn-0.5Zr alloy was conducted using a Gleeble-3500 stimulator.Based on the analysis of the microstructure and the linear fitting for curves of stress-strain,the corresponding thermal deformation constitutive relationship was established to analyze microstructure evolution.The results show that the deformation microstructure stays the as-cast homogenized microstructure morphology.With the increase of deformation temperature,time of reaching peak stress is decreased,so the difference between flow stress value and peak stress value is narrowed,and the steady state stress value is also decreased.The deformation constitutive relationship is：ε·=5.314 5×10^16[sinh（0.009 717σ）]^5.401 38exp（-253.927/RT）.

关 键 词：Mg-13Gd-4Y-2Zn-0.5Zr 峰值应力 本构方程 组织演变 

分 类 号：TG146.22[一般工业技术—材料科学与工程]