模具结构与浇注温度对Mg-6Al-2.4Y合金力学性能的影响

Effects of Mould Structure and Pouring Temperature on Mechanical Properties of Mg-6Al-2.4Y Alloy

通过微观分析和力学性能测试等方法,研究了模具结构和浇注温度对Mg-6Al-2.4Y合金力学性能的影响。结果表明,模具内腔结构的合理改进可以减少合金中的铸造缺陷,提高合金力学性能;合理的浇注温度不仅可以使铸件中的疏松、缩孔减少,而且可以有效地细化合金晶粒,提高合金的抗拉强度。当浇注温度为720℃时,合金的晶粒尺寸达到最小,为56μm,合金中的缺陷最少,抗拉强度达到最大,为225MPa。

Effects of mould structure and pouring temperature on mechanical properties of Mg-6Al-2.4Y alloy were examined by microstructure analysis and mechanical testing. The results reveal that the optimization of mould structure can improve the mechanical properties of the alloy due to decreasing the defects in the alloy. The shrinkage porosity (hole) can be created in the alloy with pouring temperature either excessively low or excessively high,however,proper pouring temperature can eliminate the shrinkage porosities (holes) in the alloy,and refine the grain size as well as improving the tensile strength of alloy.