Microstructure and high-temperature oxidation resistance of Ti-Al-Nb coatings on a Ti-6Al-4V alloy fabricated by laser surface alloying

被引：69
作者：
Dai, Jingjie [1 ,2 ]
Li, Shouying [1 ,2 ]
Zhang, Hongxia [1 ,2 ]
Yu, Huijun [3 ]
Chen, Chuanzhong [4 ]
Li, Yang [5 ]
机构：
[1] Qingdao Binhai Univ, Univ Shandong, Key Lab New Metall Funct Mat & Adv Surface Engn, Qingdao 266555, Shandong, Peoples R China
[2] Qingdao Binhai Univ, Sch Mech & Elect Engn, Qingdao 266555, Shandong, Peoples R China
[3] Shandong Univ, Sch Mech Engn, Minist Educ, Key Lab High Efficiency & Clean Mech Manufacture, Jinan 250061, Shandong, Peoples R China
[4] Shandong Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Shandong, Peoples R China
[5] Jinan Worldwide Autoaccessory Ltd, Jinan 250300, Shandong, Peoples R China
来源：
SURFACE & COATINGS TECHNOLOGY | 2018年 / 344卷
关键词：
Titanium alloy; Laser surface alloying; Ti-Al-xNb coating; High-temperature oxidation resistance; TITANIUM ALUMINIDES; BEHAVIOR;
D O I：
10.1016/j.surfcoat.2018.03.060
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this study, Ti-Al-xNb coatings were deposited on a Ti-6Al-4V alloy by laser surface alloying in order to investigate their oxidation resistance. A Ti-Al coating was fabricated for comparison. It was found that the Ti-Al and Ti-Al-xNb coatings were composed of TiAl and Ti3Al phases. Nb addition reduced the cracking tendency of the Ti-Al-xNb coatings. The Ti-Al and Ti-Al-xNb coatings exhibited good high-temperature oxidation resistance at 800 degrees C. In comparison, Ti-Al-xNb (x = 10, 20, 30 and 40) coatings had better high-temperature oxidation resistance and Ti-Al-40Nb coating had the best high-temperature oxidation resistance. The mechanism of Nb that improves the high-temperature oxidation resistance of Ti-Al-xNb coatings includes preventing the internal diffusion of oxygen, inhibiting the formation of TiO2, promoting the formation of Al2O3 and increasing the adhesion of the oxide scales.
引用
收藏
页码：479 / 488
页数：10
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