文献类型：期刊文献

英文题名：In situ synthesis of TiN/Ti₃Al intermetallic matrix composite coatings on Ti6Al4V alloy

作者：Liu, Z. D.;Zhang, X. C.[1];Xuan, F. Z.;Wang, Z. D.;Tu, S. T.

机构：[1]E China Univ Sci & Technol, Key Lab Pressurized Syst & Safety, MOE Sch Mech Engn, Minist Educ, Shanghai 200237, Peoples R China

年份：2012

卷号：37

起止页码：268

外文期刊名：MATERIALS & DESIGN

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000301591700035)】；

基金：The authors are grateful for the support by National Natural Science Foundations of China (50805047, 51175177) and National High-tech R&D Program of China (863 Program, 2009AA044803). The author X.C. Zhang is also grateful for the support by Ph.D. Programs Foundation of Ministry of Education of China (20090101120021).

语种：英文

外文关键词：A. Intermetallics; F. Microstructure; A. Composite coating

摘要：The aim of this paper was to develop an in situ method to synthesize the TiN reinforced Ti3Al intermetallic matrix composite (IMC) coatings on Ti6Al4V alloy. The method was divided into two steps, namely depositing pure Al coating on Ti6Al4V substrate by using plasma spraying, and laser nitriding of Al coating in nitrogen atmosphere. The microstructure and mechanical properties of TiN/Ti3Al IMC coatings synthesized at different laser scanning speeds (LSSs) in laser nitriding were investigated. Results showed that the crack-and pore-free IMC coatings can be made through the proposed method. However, the morphologies of TiN dendrites and mechanical properties of coatings were strongly dependent on LSS used in nitriding. With decreasing the LSS, the amount and density of TiN phase in the coating increased, leading to the increment of microhardness and elastic modulus and the decrement of fracture toughness of coating. When the LSS was extremely high (i.e., 600 mm/min), only a thin TiN/Ti3Al layer with thickness around of 100 mu m was formed near the coating surface. (C) 2011 Elsevier Ltd. All rights reserved.