镍钛记忆合金自补偿磨粒磨损性能研究  

Study of Self-Healing Abrasive Wear Behavior of Super-Elastic Ni-Ti Shape-Memory Alloy

作　　者：任万才 董元源 王成名 郭一萍[3] 

机构地区：[1]甘肃省机械科学研究院,甘肃兰州730030 [2]兰州记忆合金研究所,甘肃兰州730000 [3]西安科技大学材料系,陕西西安710054

出　　处：《摩擦学学报》2004年第4期378-381,共4页Tribology

摘　　要：研究了高临界温度镍钛记忆合金一维自补偿磨粒磨损特性.结果表明,在一定温度下,镍钛记忆合金在摩擦过程中具有形状恢复能力,从而产生一维磨损自补偿作用.超弹状态镍钛记忆合金具有热弹性马氏体相变、高阻尼、应力感生马氏体、超弹性、高应变硬化指数和时效弥散析出强化等特性,这使得硬度较低的镍钛合金的耐磨性能远优于硬度较高的淬火45#钢.利用超弹状态镍钛记忆合金的磨损自补偿作用可望开发出新型抗磨形状记忆合金产品.The self-healing abrasion behavior of superelastic Ni-Ti shape memory alloy was comparatively investigated using quenched AISI-1045 steel sample to control. The worn surface morphologies of the steel and the Ni-Ti shape memory alloy were observed on a scanning electron microscope, the temperature on the sliding surfaces was measured with a thermocouple, and the factors affecting the abrasion behavior of the alloy were discussed. It was found that the shape memory effect contributes to increase its abrasion resistance which is much superior to that of the AISI-1045 steel. Thus the abrasion resistance of the shape memory alloy is not mainly determined by its lower hardness but by its excellent shape-recovering ability. The differences in the morphologies of the worn surfaces of the steel and the shape memory alloy conform to their different abrasion resistance. It was thus suggested the shape memory alloy of superelasticity could be used to develop the frictional devices subject to short-journey sliding, such as clutch and braking disc.

关 键 词：镍钛记忆合金 磨损自补偿 超弹性 磨粒磨损性能 

分 类 号：TH117.3[机械工程—机械设计及理论]