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本文研究了合金元素含量相当高的Al—Cu—Zn—Mg系合金的磁化率及主要力学性能。合金的磁化率随着铜和锌含量的增多而减小,含20％Cu及24％Zn的Al—Cu—Zn合金,其磁化率值约为-0.009×10~(-6)cm~3/g,属抗磁性。铜和锌的含量均在20％左右的情况下,可得到一种磁化率接近零值的合金。加入少量镁时,对于铜、锌含量均≤15％的合金而言,无明显的影响,但对于含铜及锌量均大于15％的合金,则有进一步降低磁化率的作用。在试验的成分范围内,合金的强度随着铜和锌含量的增加而增大,锌的作用略大于铜;含20％Cu及24％Zn的合金,强度σb平均值可达23.7kgf/mm~2, 延伸率为零。减少铜或锌量,可使延伸率值略有提高。应力-应变曲线表明,试样在破断之前,基本上为弹性变形。合金的弹性(模量)随锌含量增多而增大,随着铜含量增加而变差。少量镁的加入,不会增大强度值,但能提高合金的弹性。磁化率与力学性能最佳配合的成分范围,应当是铜、锌含量均在20％左右,并加入少量镁的合金。
In this paper, the magnetic susceptibility and the main mechanical properties of Al-Cu-Zn-Mg alloys with high content of alloying elements were investigated. The magnetic susceptibility decreases with the increase of copper and zinc content. The magnetic susceptibility of Al-Cu-Zn alloy containing 20% Cu and 24% Zn is about -0.009 × 10 -6 cm -3 / g, is a diamagnetic. Copper and zinc content of about 20% in the case, we can get a magnetic susceptibility close to zero alloy. When a small amount of magnesium is added, it has no obvious effect on alloys with both copper and zinc contents being less than or equal to 15%, but further reducing the susceptibility to alloys containing more than 15% copper and zinc. The strength of the alloy increases with the content of copper and zinc, and the effect of zinc is slightly larger than that of copper. The average σb of the alloy containing 20% Cu and 24% Zn can reach 23.7kgf / mm ~ 2, elongation is zero. Reduce the amount of copper or zinc, the elongation value can be slightly increased. The stress-strain curve shows that the specimen is essentially elastically deformed before breaking. The elasticity (modulus) of the alloy increases with the increase of zinc content, but deteriorates with the increase of copper content. A small amount of magnesium added, will not increase the intensity value, but can improve the flexibility of the alloy. The optimum composition of magnetic susceptibility and mechanical properties of the composition should be copper, zinc content is about 20%, and adding a small amount of magnesium alloy.