硅钙合金在Mg-6Al-0.5Mn合金中的应用

Application of Silicon-calcium on Mg-6Al-0.5Mn Alloy

Mg2Si强化相可以提高镁合金的室温和高温性能,但汉字形Mg2Si,割裂基体,反而使合金的力学性能降低。本文首次将硅钙合金应用到镁合金,研究其对Mg-6Al-0.5Mn合金显微组织和性能的影响。结果表明,硅钙合金加入后改善了合金的显微组织,第2相趋于弥散分布,合金的平均晶粒尺寸从180μm减小到100μm;合金中形成了弥散分布、稳定性较高的规则多边形Mg2Si相,起到弥散强化作用;加入硅钙合金后,显著改善了合金的力学性能,Mg-6Al-0.5Mn合金的铸态显微硬度、抗拉强度、伸长率和冲击韧度都有明显的提高,合金的抗腐蚀性能也有了一定程度的改善。

The ambient and elevated temperature properties can be improved if there is Mg2Si phase in matrix of magnesium alloys.But the mechanical properties of alloys will be deteriorated while the Mg2Si phase is of coarse Chinese script type.Effects of Silicon-calcium addition on microstructure and mechanical properties of AM60 alloy were studied.The results indicate that with Silicon-calcium addition the microstructure is modified and a small polygonal type Mg2Si phase dispersedly distribute at grain boundary or in matrix.Both the mechanical properties and corrosion property of AM60 based alloy are improved.Therefore,Silicon-calcium is a promising low price alloy to improve the properties of magnesium alloy.