采用机械合金化和真空热压烧结方法制备了AlxCoCrCu0.5FeNi高熵合金,研究Al含量对合金系的晶体结构、显微组织、硬度、压缩性能以及摩擦磨损行为的影响.球磨60 h和真空热压烧结后的晶体结构均为FCC和BCC双相结构,但相对含量发生变化.Al含量的增加使合金塑性降低,硬度和强度增大,低Al含量的Al0、Al0.5合金塑性好,强度低,压缩量高达30％和25.6％;高Al含量的Al1.0、Al1.5合金塑性较差,强度高,压缩强度达到1855MPa和2083MPa,原子半径大的Al含量增加造成严重的晶格畸变,使固溶强化效应增加是合金硬度和强度升高的主要原因.随着Al含量的增加,合金的断裂方式由韧性断裂向脆性断裂转变.合金的耐磨性与硬度呈正相关关系,Al0、Al0.5、Al1.0的磨损机制为黏着磨损与磨粒磨损,Al1.5合金则为磨粒磨损.
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