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.
出处
《铸造》
CAS
CSCD
北大核心
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
关键词
镁合金
半固态
挤压铸造
力学性能
magnesium alloy
semi-solid
squeezing casting
mechanical properties
