对Cu基形状记忆合金CuZnAl进行了干滑动磨损,采用扫描电镜观察磨损表面及磨屑.结果表明,CuZnAl合金的磨损过程受塑性变形控制,粘着与转移磨损和剥离磨损是材料失重的两种主要机制.电镜薄膜拉伸时显微裂纹尖端发生了应力诱发马氏体相变.用显微裂纹钝化作用的马氏体择优取向机制和应力诱发马氏体相变机制阐述了这种软基体高变形能力材料的耐磨本质。
The wear of Cu-based CuZnAl shape memory alloys under dry sliding against steel was found to be plasticity-dominated, with adhesion and delamination being the two main mechanisms. Adhesion was observed to be accompanied by metal transfer. TEM observation on tensile test of thin foil showed that the stress-induced martensitic transformation occurred from β-phase in the vicinity of pre-existing microcracks. The blunt effect of crack tips may be proposed to explain the wear of CuZnAl shape memory alloy due to preferential orientation reaction of variants in martensite and stress-induced martensitic transformation in β-phase.
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