Al-30Si合金的固液混合铸造

Mixed solid - liquid casting of Al - 30Si alloy

研究了Al-30Si合金的固液混合铸造。结果表明,采用该工艺制备的Al-30Si合金组织细小,合金力学性能明显优于传统铸造和半固态加工合金,并且解决了传统铸造Al-30Si合金铸件难以热加工的问题。在本工艺条件下,当粉末添加量与合金熔体质量比为1时,Al-30Si合金中的初晶硅粒径可控制在30μm以下;材料的室温力学性能为:σb=129MPa,σ0.2=112MPa,δ=1.4％。

A novel mixed solid - liquid casting was utilized to prepare Al - 30Si alloy. The results show that, the as - prepared Al - 30Si alloy is characteristic of finer microstructures and higher mechanical properties than conventional casting and semi - solid casting technologies, which can successfully resolve the problem that Al - 30Si alloy prepared by conventional casting is difficult for hot processing. When mass ratio of the alloy powder to the melt is up to 1, the mean size of primary Si in the alloy can be controlled under 30 μm and its mechanical properties at room temperature is σb = 129 MPa, σ0.2 = 112 MPa, δ = 1. 4%.