MECHANICAL PROPERTIES AND HIGH TEMPERATURE OXIDATION BEHAVIOR OF Ti–Al COATING REINFORCED BY NITRIDES ON Ti–6Al–4V ALLOY

Jingjie Dai, Huijun Yu, Jiyun Zhu, Fei Weng and Chuanzhong Chen
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Jingjie Dai: Suzhou Institute, Shandong University Suzhou, Jiangsu 215123, P. R. China†Key Laboratory of High-efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Ji’nan, Shandong 250061, P. R. China§School of Mechanical and Electronic Engineering, Qingdao Binhai University, Qingdao, Shandong 266555, P. R. China
Huijun Yu: Suzhou Institute, Shandong University Suzhou, Jiangsu 215123, P. R. China†Key Laboratory of High-efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Ji’nan, Shandong 250061, P. R. China
Jiyun Zhu: #xA7;School of Mechanical and Electronic Engineering, Qingdao Binhai University, Qingdao, Shandong 266555, P. R. China
Fei Weng: #x2021;Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji’nan, Shandong 250061, P. R. China
Chuanzhong Chen: #x2021;Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Ji’nan, Shandong 250061, P. R. China

Surface Review and Letters (SRL), 2016, vol. 23, issue 05, 1-9

Abstract: Ti–Al alloyed coating reinforced by nitrides was fabricated by laser surface alloying technique to improve mechanical properties and high temperature oxidation resistance of Ti–6Al–4V titanium alloy. Microstructures, mechanical properties and high temperature oxidation behavior of the alloyed coating were analyzed. The results show that the alloyed coating consisted of Ti3Al, TiAl2, TiN and Ti2AlN phases. Nitrides with different morphologies were dispersed in the alloyed coating. The maximum microhardness of the alloyed coating was 906HV. The friction coefficients of the alloyed coating at room temperature and high temperature were both one-fourth of the substrate. Mass gain of the alloyed coating oxidized at 800∘C for 1000h in static air was 5.16×10−3mg/mm2, which was 1/35th of the substrate. No obvious spallation was observed for the alloyed coating after oxidation. The alloyed coating exhibited excellent mechanical properties and long-term high temperature oxidation resistance, which improved surface properties of Ti–6Al–4V titanium alloy significantly.

Keywords: Titanium; Ti–Al alloyed coating; nitride; mechanical properties; high temperature oxidation resistance (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1142/S0218625X16500311

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