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研究了模具温度对触变成形Sip/ZA27复合材料组织及力学性能的影响。结果表明,随着模具温度升高,锭料的凝固速率变慢,初生α-Al颗粒尺寸和体积分数增大;而且初生α-Al颗粒中Zn元素的含量增加;此外,Si颗粒的团聚倾向变得严重。通过对试样的力学性能进行比较可知,最佳的模具温度为200℃,此时的抗拉强度和伸长率分别达到382 MPa和1.17%。而且随着模具温度的增加,断裂机制发生转变。
The effect of mold temperature on the microstructure and mechanical properties of thixoformed Sip / ZA27 composites was investigated. The results show that as the mold temperature increases, the solidification rate of the ingot becomes slower, the size and volume fraction of primary α-Al particles increase, and the content of Zn element in primary α-Al particles increases. In addition, the agglomeration tendency of Si particles Become serious. By comparing the mechanical properties of the samples, the best mold temperature is 200 ℃, the tensile strength and elongation reach 382 MPa and 1.17% respectively. And as the mold temperature increases, the fracture mechanism changes.