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OALib Journal期刊
ISSN: 2333-9721
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NiAl－2.5Ta－7.5Cr－1B合金的微观组织、力学性能与摩擦磨损特性
DOI: 10.3724/SP.J.1037.2013.00452, PP. 1325-1332
Keywords: NiAl－2.5Ta－7.5Cr－1B合金,微观组织,力学性能,摩擦磨损特性
Abstract:
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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