低温退火加工硬化Al-10% Mg合金的显微组织特点和力学行为  

Microstructural Characteristics and Mechanical Behavior of Work-Hardened Al-10wt% Mg Alloy Subjected to Low Temperature Annealing

作　　者：散展翼 刘生发[1] 刘志波 林耀军 刘满平[2] San Zhanyi;Liu Shengfa;Liu Zhibo;Lin Yaojun;Liu Manping(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070 [2]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《稀有金属材料与工程》2022年第5期1550-1557,共8页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(U1810108,U1710124)。

摘　　要：研究了冷轧减薄率为75%的Al-10%Mg(质量分数)合金在75~150℃下退火的显微组织特点和力学行为。轧制态和退火态Al-10%Mg合金的特征是晶粒细长,位错密度高,Al_(3)Mg_(2)相含量极低,且无弥散分布的Al_(3)Mg_(2)相。随着退火温度的升高,细长晶粒的宽度增加,位错密度减小。在75~150℃退火后,相比于轧制态合金,其屈服强度降低8%~33%,极限抗拉伸强度降低1%~12%,延伸率增加16%~83%。此外,分析了各种强化机制对屈服强度的贡献,以及原有位错和Mg溶质对塑性的贡献。The Al-10wt%Mg alloy was cold-rolled with the thickness reduction ratio of 75%followed by annealing at 75~150℃,and its microstructure characteristics and mechanical behavior were investigated.The as-rolled and annealed Al-10wt%Mg alloys are characterized by elongated ultra-fine grains,high density of dislocations,a very small amount of Al_(3)Mg_(2) phase,and no dispersed distribution of Al_(3)Mg_(2) phase.With increasing the annealing temperature,the width of elongated ultra-fine grains is increased and the dislocation density is decreased.After annealing at 75~150℃,compared with those of as-rolled alloys,the yield strength of annealed alloys is decreased by 8%~33%,the ultimate tensile strength is decreased by 1%~12%,and the elongation is increased by 16%~83%.The contributions of various strengthening mechanisms to yield strength and the contributions of preexisting dislocations and Mg solute to ductility were analyzed and discussed.

关 键 词：铝镁合金 冷轧 退火 强度 韧性 

分 类 号：TG156.2[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]