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熔炼制得不同Mg含量的汽车发动机缸体材料Al-Si-Cu合金,以实验制得的合金为研究对象,研究了Mg元素含量对其微观组织、力学性能的影响。结果表明:汽车发动机缸体材料Al-Si-Cu合金中加入一定量的Mg能显著提高铸态及T6态合金的抗拉强度、硬度;随着Mg含量的增加,合金中开始产生Mg_2Si相,Mg_2Si相强化了合金的抗拉强度与屈服强度;但过多Mg元素将不能全部溶入基体,产生较粗大的Mg_2Si脆性相,降低合金抗拉强度及硬度,试验合金中加入0.4%Mg的合金力学性能最佳;随着冷却速率的增加,合金抗拉强度、屈服强度和硬度均增加。
The Al-Si-Cu alloy was prepared by melting the Mg alloy with different Mg contents. The effects of Mg content on the microstructure and mechanical properties of the alloy were studied. The results show that adding a certain amount of Mg into Al-Si-Cu alloy can significantly increase the tensile strength and hardness of the as-cast and T6 alloy. With the increase of Mg content, Mg2Si phase begins to be formed in the alloy, Mg2Si phase strengthens the tensile strength and yield strength of the alloy; however, too much Mg element will not fully dissolve into the matrix, resulting in a larger Mg2Si brittle phase, reducing the tensile strength and hardness of the alloy, adding 0.4% Mg alloy The best mechanical properties; with the cooling rate increases, the alloy tensile strength, yield strength and hardness are increased.