力学性能的影响
(东北大学 材料与冶金学院， 沈阳 110004)
摘 要: 探索了通过加入金属Mn并结合熔体热处理工艺来控制铝硅合金中富铁相的形态。 结果表明： 熔体经过预先热处理后， 加入Mn可以使绝大多数针状铁相转变成块状铁相， 且粒径均一； 预先热处理可以减少Mn的加入量而取得较好的效果， 适宜的加入量为x(Mn)/x(Fe)=0.5~1.1(摩尔比)， 并可以通过控制Mn的加入量来控制块状富铁相杂质的粒径大小； 经过联合处理的含铁铝硅合金的抗拉强度提高40~80MPa， 伸长率提高6%~7%。
关键字: 富铁相； 预先热处理； 杂质； 粒径； 力学性能
（ School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, China）
Abstract: The control of the shape of iron-rich phase were realized by adding manganese in melt of Al-Si alloy and pre-heat treatment. The results show that the needle-like iron phase can mostly be transformed into lumpish by adding manganese after pre-heat treatment, and the grain sizes are symmetrical. The better effect can be gained by adding less manganese after heat-treatment, and the grain size can be controlled by controlling the amount of manganese basically. The suitable amount of Mn is x(Mn)/x(Fe)=0.5~1.1(molar ratio). After the combined treatment, the tensile strength and elongation of Al-Si alloy are improved by 40~80MPa and 6%~7%, respectively.
Key words: iron-rich phase; pre-heat treatment; impurity; grain size; mechanical property
