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采用SEM和XRD分析了NiAl-2.5Ta-7.5Cr-1B合金的微观组织,采用万能力学试验机测试了合金的力学性能,采用高温摩擦磨损机研究了合金室温-600℃的摩擦磨损特性.研究表明,NiAl-2.5Ta-7.5Cr-1B合金由NiAl相、NiAl-Cr共晶、Cr2Ta相、(Ta,Cr)3B2相和TaB相组成.B元素的添加使NiAl-2.5Ta-7.5Cr合金的塑性提高了50%.从室温-600℃时,NiAl-2.5Ta-7.5Cr-1B合金表现出良好的自润滑耐磨损特性,其自润滑耐磨损特性来源于合金磨损表面存在固体Al4B2O9颗粒和液态B2O3,液态B2O3使摩擦磨损符合流体动压润滑机制,Al4B2O9颗粒起到支撑作用.

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