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研究了部分重熔时间、模具温度对于触变成形AZ63H镁合金微观组织和力学性能的影响。结果表明,抗拉强度和伸长率随着部分重熔时间的延长和模具温度的升高先上升后下降。这是因为,相对于金属型铸造的AZ63H,触变成形大大减少了气孔率,也影响了熔体中溶质的分布,使得β-Mg17Al12相中的Al元素在初生α相中的固溶度也发生了很大的改变,即空隙、杂质、气孔等缺陷减少甚至消失,固溶强化增加,提高了材料的力学性能,在模具温度为300℃时,抗拉强度和伸长率的最大值分别为273MPa和10.3%。
The effects of partial remelting time and mold temperature on the microstructure and mechanical properties of thixoformed AZ63H magnesium alloy were investigated. The results show that the tensile strength and elongation increase first and then decrease with the increase of partial remelting time and the increase of mold temperature. This is because thixoforming greatly reduces the porosity relative to the cast AZ63H and also affects the solute distribution in the melt such that the solubility of Al in the β-Mg17Al12 phase in the primary α phase A great change has taken place, that is, the defects such as voids, impurities and pores decrease or even disappear, and the solid solution strengthening increases to improve the mechanical properties of the material. When the mold temperature is 300 ℃, the maximum values of tensile strength and elongation are respectively 273 MPa and 10.3%.