7A62铝合金在热磁时效后的析出行为与力学性能
Precipitation behavior and mechanical properties of 7A62 aluminum alloy after thermal-magnetic aging
丁学锋 1刘文辉 2黄浩 3胡强 1张秦 1宋宇峰1
作者信息
- 1. 湖南科技大学 机电工程学院,湘潭 411201
- 2. 湖南科技大学 机电工程学院,湘潭 411201;集美大学 海洋装备与机械工程学院,厦门 361021
- 3. 江麓机电集团有限公司,湘潭 411100
- 折叠
摘要
采用透射电镜(TEM)、X射线衍射(XRD)、硬度及室温拉伸性能测试等方法,研究了热磁时效作用对7A62铝合金微观组织与力学性能的影响.结果表明:在热磁时效作用下,7A62铝合金内部的位错移动性增强,溶质原子移动速率加快,进而促进了析出相的形核与长大,峰值时效时间显著缩短,仅为未加磁峰值时效时间的1/3(即峰值时效时间由24 h缩短至8 h).此外,磁场作用还会诱发位错退钉扎效应以及晶界无沉淀析出带的宽化作用,促使热磁峰时效后7A62铝合金伸长率较未加磁峰时效时提高15.6%.因此,热磁耦合作用可加速铝合金的时效析出过程,改善其力学性能,显著提高铝合金的生产效率.
Abstract
The effects of thermal-magnetic aging on precipitation behavior and mechanical properties of 7A62 aluminum alloy were studied by hardness test,TEM,XRD and tensile properties tests.The results show that under the effect of the thermal magnetic coupling aging,the dislocation mobility in 7A62 aluminum alloy is enhanced and the movement rate of solute atoms is accelerated,which promote the nucleation and growth of precipitates.The peak aging time is greatly shortened,which is only 1/3 of the peak aging time without magnetic addition(i.e.the peak aging time is shortened from 24 h to 8 h).The magnetic field induces the dislocation depinning and promotes the PFZ of grain boundary broadening,and the elongation of 7A62 aluminum alloy after thermal-magnetic peak aging increases by 15.6%than that after conventional peak aging.Therefore,the thermal magnetic coupling can accelerate the aging precipitation process of aluminum alloy,improve its mechanical properties,and significantly improve the production efficiency of aluminum alloy.
关键词
7A62铝合金/热磁时效/析出行为/力学性能Key words
7A62 aluminum alloy/thermal-magnetic aging/precipitation behavior/mechanical property引用本文复制引用
基金项目
国家自然科学基金(U21A20130)
国家自然科学基金(52375332)
国家自然科学基金(52005177)
湖南省研究生科研创新项目(CX20231040)
出版年
2024
NETL
NSTL
维普
万方数据