机械振动和半固态等温热处理对消失模AZ91D组织的影响  

Influence of Mechanical Vibration and Semisolid Isothermal Heat Treatment on Microstructure of Lost Foam AZ91D Magnesium Alloy

作　　者：刘静[1] 王元庆[1] 彭小明 

机构地区：[1]西南技术工程研究所,重庆400039 [2]总装备部驻江津地区军代室,重庆402264

出　　处：《精密成形工程》2013年第3期1-5,共5页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金资助项目(50275058)

摘　　要：研究了不同浇注温度下消失模铸造AZ91D镁合金试样,在振动凝固和"振动凝固+半固态热处理"条件下组织的变化情况结果表明,对不同浇注温度下消失模铸造AZ91D镁合金试样实施振动凝固都能细化试样的显微组织,且在浇注温度为740℃,振动力为1.5 kN时细化效果最好;对经振动和不振动凝固的试样进行半固态等温热处理,两者的组织都能得到球化,且随着等温时间的延长,两者的组织都会合并长大,其中半固态等温热处理的较佳工艺为570℃下保温10 min。The microstructure evolution of the casting sample of magnesium alloy AZ91D via lost foam casting （LFC） with vibra- tion solidification and ＂vibration solidification plus semisolid heat treatment＂ in different pouring temperatures was investigated. The results show that the microstructure all can be refined by vibrating the casting sample of magnesium alloy AZ91D via lost foam casting （LFC） in different pouring temperatures in solidification and the refining effect is best in the pouring temperature of 740 ℃ and the vi- bration force of 1.5 kN. The semisolid isothermal heat treatment is conducted to the two kinds of samples with and without vibration so- lidification. Their microstructures all become spherical. With elongation of isothermal time the microstructures of these two kinds of samples will merge and grow up. The better isothermal heat treatment process is ＂holding 10 minutes in 570℃＂

关 键 词：AZ91D镁合金 消失模铸造 振动凝固 半固态热处理 组织演变 

分 类 号：TG146.22[一般工业技术—材料科学与工程]