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通过研究Zn和RE在AlMgSiCu合金中所起的作用,发现Zn含量增加会减少合金中的Al含量以及Al-Cu化合物的形成趋势,增加合金中的Cu Zn2富铜相,可使得合金的抗拉强度和硬度增加;对RE的研究证实了RE对高锌铝合金的细化作用,但是过量的RE在高锌铝合金中会形成针状RE化合物,这对合金的力学性能产生副作用。试验中当Zn和RE含量分别为7.5%、0.2%时,组织中没有出现明显的针状RE相,合金综合性能最好,抗拉强度343.14MPa、硬度112.3 HB,对于1#合金分别提高了10.2%、2.7%,只是伸长率下降了17.5%。
By studying the role of Zn and RE in AlMgSiCu alloy, it was found that the increase of Zn content will reduce the Al content in the alloy and the formation tendency of Al-Cu compound. Increasing the Cu-Zn2 Cu-rich phase in the alloy will make the alloy tensile Strength and hardness increase. The RE study confirmed the refinement effect of RE on high-zinc-aluminum alloy. However, RE excessively formed acicular RE compounds in high-zinc-aluminum alloy, which had side effects on the mechanical properties of the alloy. When the content of Zn and RE were 7.5% and 0.2% respectively, no obvious RE phase appeared in the microstructure. The best comprehensive properties of the alloy were tensile strength 343.14MPa and hardness 112.3 HB, 10.2%, 2.7%, but the elongation decreased by 17.5%.