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Mechanical and tribological properties of Al-40Zn-Cu alloys

机译：Al-40Zn-Cu合金的力学和摩擦学性能

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摘要

One binary Al-40Zn and five ternary Al-40Zn-Cu alloys with different copper contents were prepared by permanent mould casting. Their microstructure and mechanical properties were investigated in as-cast state. Friction and wear properties of the ternary alloys were studied using a conforming block-on-disc type tester. The results obtained were compared with those of SAE 65 bearing bronze. The microstructure of Al-40Zn-Cu alloys consisted of aluminium-rich α dendrites surrounded by eutectoid α+η phases and θ (CuAl{sub}2) particles. Hardness of the ternary alloys increased continuously with increasing copper content, but their tensile strength decreased above 3% Cu. Friction coefficient and temperature of the Al-40Zn-Cu alloys and bronze increased in the initial period of run. This was followed by a reduction in the properties and attainment of constant levels afterwards. However, volume loss of the alloys increased rapidly at the beginning of the test run and reached almost constant levels after a sliding distance of approximately 400 km. The Al-40Zn-Cu alloys were found to be much superior to the SAE 65 bronze, as far as their wear resistance is concerned. Among the alloys tested, highest strength and wear resistance were obtained with the Al-40Zn-3Cu alloy.
机译：通过永久铸模制备了一种铜含量不同的二元Al-40Zn和五元Al-40Zn-Cu合金。在铸造状态下研究了它们的微观结构和力学性能。三元合金的摩擦和磨损性能使用符合要求的圆盘块型测试仪进行了研究。将获得的结果与SAE 65轴承青铜进行了比较。 Al-40Zn-Cu合金的显微组织由被共析α+η相和θ（CuAl {sub} 2）颗粒包围的富铝α树枝晶组成。随着铜含量的增加，三元合金的硬度持续增加，但在3％以上的Cu下其抗拉强度下降。在运行初期，Al-40Zn-Cu合金和青铜的摩擦系数和温度均升高。其次是性能降低，然后达到恒定水平。但是，合金的体积损失在试验开始时迅速增加，并且在大约400 km的滑动距离后达到了几乎恒定的水平。就耐磨性而言，发现Al-40Zn-Cu合金要优于SAE 65铜。在测试的合金中，使用Al-40Zn-3Cu合金可获得最高的强度和耐磨性。

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