Al含量对Fe_3Al金属间化合物耐磨性的影响  

Effect of Al Contents on Wear Properties of Fe_3Al Intermetallics

作　　者：李静[1] 蔡元兴[1] 林晓娟[1] 于宽[1] 潘悦飞[1] 

机构地区：[1]山东建筑大学材料科学与工程学院

出　　处：《金属热处理》2007年第2期23-26,共4页Heat Treatment of Metals

基　　金：教育部博士点基金资助项目(20020422001);山东省重点基金资助项目(Z2002F02)

摘　　要：采用机械合金化和热压烧结法制备了不同A l含量的Fe3A l金属间化合物块体材料,室温下在M-2000磨损试验机上进行了不同载荷和距离的干摩擦磨损试验,利用SEM观察试样磨损后的表面形貌,对其耐磨性能和磨损机理进行了研究。结果表明,A l含量对热压烧结Fe3A l的耐磨性能有显著影响。除Fe-30A l外,A l含量越高,耐磨性越好,其中Fe-32A l的磨损量大幅度下降,而Fe-30A l出现反常。不同A l含量的Fe3A l块体材料的耐磨性与其力学性能密切相关。不同载荷下Fe3A l块体材料的磨损机制有着明显差异:低载荷下磨损表面发生塑性变形,磨损形式是以磨粒磨损为主的微切削和微犁沟;而在高载荷下,应力集中产生裂纹并迅速扩展,最终导致疲劳断裂,以片层状剥落为主要特征。Fe3Al intermetallics bulk materials with different Al contents were prepared by mechanical alloying and hotpressed sintering. The dry wear tests were carried on M-2000 tester at room temperature. The microstructures of worn surfaces were observed by SEM. The wear resistance and mechanisms of Fe3 Al intermetallics were studied. The results show that A1 content has remarkable effect on the wear resistance of Fe3Al bulk materials. With the increase of A1 content, the wear resistance improves, with the greatly decreased wear volume loss of Fe-32Al and irregular value of Fe30Al. The wear resistance of Fe3Al has definite relationship with its mechanical properties. SEM morphology of worn surface indicates that there are obvious differences in wear mechanisms of Fe3Al under different wear conditions. Under lower loads plastic deformation occurrs on the wear surface and the wear has mainly abrasive character, the feature of which are micro cutting and furrows. With higher loads, the stress concentration leads to rapid crack propagation and eventually the fatigue fracture ,which was characterized with brittle split.

关 键 词：FE3AL金属间化合物 A含量 耐磨性 磨损机理 

分 类 号：TB174.442[生物学—生物工程]