摘要:
分析了镍铝青铜BAl7-7-2-2合金及其热处理后的金相组织、硬度、拉伸性能、冲击韧性和摩擦磨损性能。结果表明,镍铝青铜BAl7-7-2-2合金经热处理后,组织发生再结晶细化,κ相析出减少,强度、硬度降低,冲击性能显著提高;BAl7-7-2-2合金摩擦系数低于QAl9-4合金的,热处理后摩擦系数继续减小,减摩性能优异;BAl7-7-2-2合金的磨损率高于QAl9-4合金的,热处理后磨损率降低,磨痕宽度和深度减小,耐磨性得到提高,接近QAl9-4合金的水平。
Abstract:
The microstructure, hardness, tensile properties, impact toughness and friction-wear performances of nickel aluminum bronze alloy (BAl7-7-2-2) before and after heat treatment were analyzed. The microstructure of BA17-7-2-2 heat treated recrystalized and refined, and the precipitates of κ phase decreased, resulting in reduced hardness and strength and increased impact toughness. The friction coefficient of BAl7-7-2-2 alloy was lower than that of QAl9-4, and the friction coefficient of BAl7-7-2-2alloy after heat treatment was lower than that of the original one, demonstrating an excellent performance of antifriction. The wear rate of BAl7-7-2-2 alloy was higher than that of QAl9-4 alloy, while the wear rate of BAl7-7-2-2 alloy after heat treatment was reduced, the width and depth of grinding crack became narrower and shallower than those of BAl7-7-2-2, and its wear resistance was improved to the level of that of QAl9-4 alloy.
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