摘要
针对2219铝合金环轧件,采用硬度测试、室温拉伸试验,结合SEM、TEM进行显微组织观察与分析,研究了形变热处理工艺参数(冷变形量、时效温度及时间)对合金性能的影响。结果表明:冷变形显著影响2219环轧件的力学性能。随冷变形量的增加,合金强度先增后减,塑性下降;采用535℃固溶+3.5%冷压变形+190℃×15 h时效对2219铝合金环轧件进行形变热处理,获得的批产件力学性能满足设计指标要求,且稳定性较好;环件不同方向的力学性能差异主要体现在塑性指标上,过剩相CuAl_2的形态与分布是造成差异的主要原因;过剩相CuAl_2尺寸越小,塑性越好。
By hardness test, tensile test, combined with SEM and TEM microscopic observation and analysis of microstructure of deformation, the influence of heat treatment parameters（cold deformation, aging temperature and time） on the properties of 2219 aluminum alloy was studied. The results show that the cold deformation significantly affects the mechanical properties of the 2219 aluminum alloy ring. With the increase of cold deformation, the strength of the alloy increases firstly and then decreases. The ductility decreases in this process. By 535 ℃ solid solution＋3.5% cold deformation ＋190 ℃ aging for 15 h, the mechanical properties of the batch products meet the design requirements. The stability of the ring is good. The plasticity index in different directions is mainly different. The morphology and distribution of excess CuAl_2 phase is the reason of the difference. The smaller the second phase size, the better the plasticity of the alloy.
出处
《热加工工艺》
CSCD
北大核心
2017年第16期227-230,共4页
Hot Working Technology
关键词
2219铝合金
形变热处理
固溶
冷变形
时效
2219 aluminum alloy
thermo-mechanical treatment
solid solution
cold deformation
aging
