壁厚对ZA52镁合金半固态挤压件组织性能的影响  

Effect of Wall Thickness on Microstructure and Property of ZA52 Magnesium Alloy by Semi-Solid Squeezing Casting

作　　者：阎峰云[1,2] 邵敬涛[1] 樊志斌[1] 黄晓锋[1,2] 陈体军[1,2] 马颖[1,2] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,甘肃兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,甘肃兰州730050

出　　处：《铸造》2012年第11期1340-1343,1347,共5页Foundry

基　　金：国家973计划(2010CB635106);甘肃省高等学校基本科研项目资助

摘　　要：采用优化的试验参数,在四柱压力机上对ZA52镁合金进行半固态触变挤压试验,制备出阶梯试样。对其不同壁厚处的组织、性能进行了分析,并与金属型浇注、半固态压铸做了对比。结果表明:挤压件中出现液固分离现象;随着壁厚的减小,其固相颗粒组织由近似圆形过渡为梭形,有些颗粒甚至压合在一起;其抗拉强度由208.4 MPa增加到270.1 MPa、伸长率由7.10%增加到17.71%,最小壁厚处综合力学性能最好,且明显优于金属型浇铸及半固态压铸。The three-step parts of ZA52 magnesium alloy have been obtained by using semi-solid squeezing casting with optimum parameters on the four-column hydraulic press with metal mold. The microstructure and mechanical properties of the different zones have been contrasted and analyzed, which are different from other casting processes such as permanent mold casting and semi-solid die-casting. The results show that the liquid-solid separation exists in the squeezing parts; the microstructure changes from round to fusiform, and even some spheres press together with the decrease of thickness; the tensile strength increases from 208.4 MPa to 270.1 MPa, and the elongation increases from 7.10% to 17.71%. The comprehensive mechanical properties of the thinnest wall thickness are better than others and those of permanent mold casting and semi-solid die-casting.

关 键 词：镁合金 半固态 挤压铸造 力学性能 

分 类 号：TG292[金属学及工艺—铸造]