镧铈混合稀土对AlSi10MgMn合金组织及性能的影响

Effects of Rare Earth Elements(La,Ce)Addition on Microstructures and Mechanical Properties of AlSi10MgMn Alloy

采用光学显微镜、扫描电镜、维氏硬度仪及室温拉伸测试等手段,对不同稀土(La,Ce)含量的AlSi10MgMn合金铸态组织及力学性能进行研究。结果表明,混合稀土(La,Ce)对合金组织中的α-Al、共晶Si、AlMnSi和Mg2Si相均有细化作用,并使β-AlFeSi相消失。稀土(La,Ce)含量为0.1%时,合金的综合力学性能较好,硬度(HV)、抗拉强度和屈服强度分别为82.76、373.05 MPa、281.37 MPa,较未加稀土的合金分别提高12.95%、17.29%、43.44%,而伸长率为2.26%,降低了11.37%。另外,混合稀土(La,Ce)对合金断裂方式影响较小。

The as-cast microstructure and mechanical properties of AlSi10 MgMn alloy with different rare earth(La,Ce)contents were investigated by means of optical microscope,SEM,Vickers hardness and tensile test at room temperature.The results show that rare earth(La,Ce)can refineα-Al,eutectic silicon,AlMnSi and Mg2Si phases in the alloy,and eliminateβ-AlFeSi phase.When the content of added rare earth(La,Ce)is 0.1%,the hardness,tensile strength and yield strength of the alloy reach 82.76 HV、373.05 MPa and 281.37 MPa,respectively,which are 12.95%、17.29%and 43.44%higher than those of ones without rare earth,while the elongation is reduced to 2.26%,decreased by 11.37%.Furthermore,the addition of rare earth(La,Ce)has little effect on the fracture mode of the alloy.