摘要
通过添加不同含量的镁制备出Al-10Si-2.5Cu-xMg(x=0.5%,1.0%,1.5%和2.0%)合金,研究镁含量对Al-10Si-2.5Cu合金组织及力学性能的影响。结果表明:随着镁含量的增加,铸态合金显微组织中的共晶硅得到了细化,而T6热处理使得合金显微组织中的硅相溶断并且球化;当镁含量为1.5%时,铸态和T6态合金的抗拉强度分别达到最大值290 MPa和305 MPa;铸态合金的硬度在镁含量为2.0%时达到最大值112 HV5,T6态合金的硬度在镁含量为1.5%时达到最大值127 HV5;铸态合金的拉伸断口中存在一定量的解理面和少量的韧窝,断裂方式由准解理断裂向脆性断裂转变。
Al-10Si-2.5Cu-xMg(x = 0.5%,1%,1.5% and 2%) alloys were prepared by adding different content of magnesium.The effect of magnesium content on the microstructure and mechanical properties of Al-10Si-2.5Cu alloy was investigated.The results show that the eutectic silicon in the microstructure of the as-cast alloy is refined with the increase of the magnesium content,and the T6 heat treatment makes the silicon phase disintegration and spheroidization in the microstructure of the alloys.When the magnesium content is 1.5%,the tensile strengths of the as-cast and T6-state alloys reach the maximum values of 290 MPa and 305 MPa,respectively.The hardness of the ascast alloy reaches a maximum of 112 HV5 at a magnesium content of 2.0%,and the hardness of the T6 alloy reaches a maximum of 127 HV5 at a magnesium content of 1.5%.There are a certain amount of cleavage planes and a small amount of dimples in the fractures of as-cast alloys,and the fracture mode changes from quasi-cleavage fracture to brittle fracture with the increase of the magnesium content.
引文
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