中文摘要：

利用高能球磨和真空热压烧结技术制备了Ni Cr Mo和Ni Cr Mo Al两种不同的合金.研究了Al元素对合金的微观组织结构和机械性能的影响,考察了不同温度（RT~900℃）条件下合金的摩擦磨损性能,并对磨损机理进行分析.结果表明：Al元素的加入减少了合金粉末的团聚,促进了烧结过程中合金晶粒的长大,提高了合金的致密度和硬度;尤其在高温摩擦环境中,与Ni Cr Mo合金相比,含有Al元素的Ni Cr Mo Al合金能在摩擦表面形成由Mo O3、Ni O和Ni Mo O4等组成的摩擦层,且没有Cr2O3硬质相的生成,极大提高了其高温下的摩擦学性能.

英文摘要：

In this paper, two different alloys of NiCr Mo and NiCrMoAl were prepared by high-energy ball milling and vacuum hot press sintering technology. The effects of Al on the microstructure and mechanical properties of alloys,especially its friction and wear properties under different temperature（RT~900 ℃） were studied. The results show that the addition of Al improved both the compactness and hardness of the alloy and the growth of the grain in the sintering process; meanwhile it also reduced the agglomeration of the alloy powders. At high temperatures, the friction-layer on the worn surface of NiCrMoAl alloy was composed of MoO_3, NiO and NiMoO_4, but free of Cr_2O_3（found on the worn surface of NiCr Mo alloy）, and rendered good tribological performance.