干摩擦对金属材料亚表层微观结构的影响  

Investigation of Subsurface Microstructure in the Metals Subjected to Dry Friction

作　　者：张于胜[1] 于振涛[1] 董付超[1] 余森[1] 袁思波[1] 张亚峰[1] 刘春潮[1] 皇甫强[1] 麻西群[1] 牛金龙[1] 贺新杰[1] 汶斌斌[1] 

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《纳米科技》2012年第5期27-30,共4页

基　　金：国家自然科学基金青年基金项目（50901062）;国家支撑计划项目（编号：2012BA118802）;国家973计划项目（2012CB619102）.

摘　　要：滑动摩擦可以产生极高的应变和应变率，导致金属表层强烈塑性变形。经过摩擦处理后，纯铜、纯铌表层均发生严重塑性变形。纯铜塑性变形层厚度200—4001μm之间，变形层深度随载荷、速率升高而增加，在200cycles即接近饱和。变形层沿深度方向呈梯度变化分布，其亚表层呈梯度结构，分别为塑性流动层、变形层和基体，最表层晶粒尺寸达到纳米量级。纯铌经过摩擦处理后，磨损量较大，表面较粗糙，且亚表层变形不太均匀。The microstructure of surface layer in metallic materials will be changed dramatically with the large strain and high strain rate induced by the sliding friction. Severe plastic deformation in the surface layer of pure copper and niobium occurs due to dry friction. For copper, the deformation depth increases with and increasing load and velocity, and reach maximum at 200cycles. The deformation layer is 200-400μm in depth with a gradient structure, which were named plastic flow layer, deformation layer and matrix, respectively. For pure niobium, the surface layer is nonuniform with high surface roughness, which is attributed to the high wear volume in dry condition.

关 键 词：滑动摩擦 纯铜 纯铌 严重塑性变形 纳米 

分 类 号：TG115.58[金属学及工艺—物理冶金] TB31[金属学及工艺—金属学]