浇注温度和机械振动对消失模铸造镁合金组织和力学性能的影响  

Effects of Pouring Temperature and Mechanical Vibration on Microstructure and Mechanical Properties of Lost Foam Casting Magnesium Alloy

作　　者：王元庆[1] 樊自田[1] 李继强[1] 田学锋[1] 董选普[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《铸造》2007年第3期266-269,共4页Foundry

基　　金：国家自然科学基金资助项目(50275058)

摘　　要：研究结果表明:低的浇注温度有利于细化AZ91D消失模铸件试样的晶粒和提高其力学性能,但低于740℃时晶粒细化程度和力学性能相差不大;机械振动能明显细化不同浇注温度下的消失模AZ91D晶粒,且在740℃温度下细化程度最好;机械振动能大幅提高AZ91D消失模铸件试样的力学性能,其中抗拉强度和断后伸长率相比于铸态的,分别提高了23.2%和20.8%。The effects of pouring temperature and mechanical vibration on microstructure and mechanical properties of AZ91D alloy via LFC were investigated in this paper. The results showed that it is propitious to refine the grain of AZ91D alloy via LFC and improve its mechanical properties at low pouring temperature, but the refined effort is not obvious and its mechanical properties is near after lowering to 740 ℃; the grain of AZ91D alloy at different pouring temperature can be obviously refined by mechanical vibration, and the refined effort is best at 740℃ ; mechanical vibration can also improve its mechanical properties to a great extent, and the values of tensile strength, elonoation are resoectivelv imoroved by 23.2%, 20.8%. compared to as-cast.

关 键 词：AZ91D 消失模铸造 浇注温度 机械振动 

分 类 号：TG249.5[机械工程—精密仪器及机械]