摘要
对AZ91D镁合金的真空压铸工艺进行了实验研究,讨论了型腔真空压力和铸造压力等工艺参数对于铸件密度、抗拉强度、屈服强度和伸长率等力学性能指标的影响规律。研究结果表明:型腔真空压力和铸造压力是影响铸件密度和抗拉强度关键参数。铸造压力增加或真空压力降低时,铸件密度和抗拉强度增加。同时,研究了铸件在T6处理前后的力学性能,型腔真空压力为5kPa条件下的铸件在T6处理后未发生起泡现象,T6处理后试样的抗拉强度和屈服强度提高,伸长率降低。
Systematic experiments on vacuum die casting process were conducted with AZ91D magnesium alloy. The influences of process conditions, such as cavity vacuum pressure, casting pressure, injection speeds at different injection phases, and casting thickness, etc., on mechanical properties including density, ultimate tensile strength, yield strength, elongation, etc., were discussed. Experimental results showed that the cavity vacuum pressure and the casting pressure are the key factors that influence the density and the ultimate tensile strength （UTS） of the test specimens. The density and UTS increase with the increase of the casting pressure or the decrease of the cavity vacuum pressure. Besides, mechanical properties of the test specimen before and after T6 treatment were investigated, and no blisters were observed on the die-cast specimens under a vacuum pressure of 5 kPa after T6 treatment. Both UTS and yield strength were improved after T6 treatment while the elongation was decreased.
出处
《铸造技术》
CAS
北大核心
2007年第12期1579-1583,共5页
Foundry Technology
基金
国家自然科学基金(50475016)
国家重点基础研究发展项目(2006CB605208-2).
关键词
真空压铸
AZ91D镁合金
力学性能
Vacuum die casting
AZ91D magnesium alloy
Mechanical properties
