摘要
Al4Cu2Ni2Mg合金是一种可时效硬化合金。研究不同固溶和时效热处理工艺参数对Al4Cu2Ni2Mg合金显微组织、硬度和耐磨性能的影响。采用光学显微镜和扫描电镜对样品的显微组织进行表征。通过硬度测试和磨损试验研究热处理工艺对材料性能的影响。结果表明,合金经过8h时效后,硬度值从未经时效处理的HV1096.5增加到HV10151.1,继续延长时效时间会导致合金的硬度值下降。随着合金硬度的提高,其耐磨性能得到提升。综合实验结果表明,在540°C固溶处理8h,然后在190°C时效处理8h,为该合金的最优热处理条件。
Al4Cu2Ni2Mg alloy is an age-hardenable aluminum alloy. The effect of different solution and aging heat treatment conditions on the microstructure, hardness and wear resistance of the alloy was studied. The cast specimens were solution treated and then artificially aged. Optical microscopy and scanning electron microscopy were used to investigate the microstructures of the specimens. The hardness and wear tests were applied to understanding the effects of heat treatment. After aging for 8 h, the hardness of the alloy increases from HV 10 96.5 to 151.1. Aging treatment for a longer duration causes a drop in the hardness because of over aging. Increasing the hardness of the alloy increases the wear resistance. As a result of all tests, solution heat treatment at 540 °C for 8 h and aging at 190 °C for 8 h were chosen for optimum heat treatment conditions for this alloy.
