Wear resistance of NiTi alloy after surface mechanical attrition treatment期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Wear resistance of NiTi alloy after surface mechanical attrition treatment

Authors:	T. Hu G.Y. Sun C.L. Chu Z.W. Wu J. Lu Paul K. Chu

Affiliation:	^a Department of Physics & Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong ^b Department of Mechanical Engineering, the Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong ^c State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China ^d School of Materials Science and Engineering, Hubei University, Wuhan 430062, China ^e School of Materials Science and Engineering, Southeast University, Nanjing 211189, China ^f Department of Orthopaedics & Traumatology, The University of Hong Kong, Pokfulam Road, Hong Kong

Abstract:	An ultrafine grain layer consisting of nanocrystallites as well as submicrometer grains is produced on NiTi shape memory alloy by surface mechanical attrition treatment (SMAT) and the effects of the ultrafine grain layer on the tribological properties are investigated under dry sliding conditions. Compared to the coarse grain (CG) NiTi, the SMAT NiTi has smaller friction coefficients and improved wear resistance at applied loads from 5 to 15 N due to the grain refinement effect. Examination of the worn surfaces indicates that materials delamination and particles co-exist on both the CG and SMAT NiTi samples. Our results indicate that delamination is the main wear mechanism on CG NiTi whereas abrasive particles dominate the wear process on SMAT NiTi.

Keywords:	Nickel titanium shape memory alloy (NiTi SMA) Surface mechanical attrition treatment (SMAT) Ultrafine grain Grain refinement Wear resistance
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