激光熔凝处理对NiTi形状记忆合金微动磨损性能的影响  

Fretting wear behavior of laser surface melted NiTi shape memory alloy

作　　者：张春华[1] 张卓[2] 张松[2] 韩忠[3] 文效忠[4] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004 [2]沈阳工业大学材料科学与工程学院,沈阳110178 [3]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016 [4]香港理工大学工业及系统工程学系

出　　处：《焊接学报》2008年第7期22-24,28,共4页Transactions of The China Welding Institution

基　　金：中国博士后科学基金(20060400957);辽宁省教育厅研究发展计划(05L30;20060636)

摘　　要：采用高功率连续波固体Nd:YAG激光器,对NiTi形状记忆合金进行激光表面熔凝处理,利用SRVⅢ摩擦磨损试验机考察激光熔凝处理对NiTi形状记忆合金微动磨损性能的影响。采用扫描电子显微镜及能谱仪分析NiTi形状记忆合金表面磨痕形貌及磨损产物成分;用形貌仪测量样品表面磨痕深度,并对磨损体积进行计算。结果表明,与NiTi合金相比,熔凝层摩擦系数,磨损体积均显著降低,表明激光熔凝处理提高了Ni-Ti合金的耐微动磨损性能。NiTi合金微动磨损机理主要表现为氧化和磨粒磨损,而Ni-Ti合金激光熔凝层磨损机制主要以疲劳剥层理论及磨粒磨损为主。Laser surface melting(LSM) on the surface of NiTi shape memory alloy(SMA) was fabricated with a continuous wave Nd-YAG laser.The fretting behavior of NiTi LSM layer was investigated with a SRV Ⅲ friction and wear tester.The surface morphologies and the component of wear debris were analysed by scanning electron microscopy(SEM) and energy dispersive spectroscope(EDS).The wear depth was measured with a surface profiler,and the wear volume was also calculated.The results show that the friction coefficient and the wear volume of NiTi LSM are lower than those of NiTi alloy,laser surface melting improves the fretting wear resistance of NiTi alloy,the fretting wear mechanism of NiTi alloy is mainly grain abrasive and oxidation,and the fretting wear mechanism of NiTi LSM is fatigue flake mechanism and grain abrasive.

关 键 词：NITI形状记忆合金 激光表面熔凝 微动磨损 磨损机制 

分 类 号：TG174[金属学及工艺—金属表面处理]