Microstructure and tribological properties of laser in-situ synthesized Ti3Al composite coating on Ti-6Al-4V

SURFACE & COATINGS TECHNOLOGY

卷:395

Article

Zhang, Wenbin¹  Li, Wensheng¹  Zhai, Haimin¹  Wu, Yanrong²  Wang, Shuncai³  Liang, Gang²  Wood, Robert J. K.³ 

[1] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China

[2] Dongfang Elect Corp Dongfang Turbine Co Ltd, Deyang 618000, Peoples R China

[3] Univ Southampton, Fac Engn & Environm, Natl Ctr Adv Tribol, Southampton SO17 1BJ, Hants, England

关键词: Ti3Al composite coating;    Laser cladding;    Microstructure;    Friction and Wear;   

DOI  :  10.1016/j.surfcoat.2020.125944

来源: Elsevier

【 摘 要 】

Titanium intermetallics are highly significant to protect surfaces of lightweight structures against corrosion and wear. In this study, Ti and Al powders were uniformly mixed with an atomic ratio 65:35 and in-situ synthesized on Ti-6Al-4V substrate by laser cladding with Ar cooling. The microstructure and high temperature tribological behavior were studied. The results show that Ti3Al (alpha(2)) phase was first precipitated in the form of coarse primary dendrites during cladding solidification, and subsequently alpha-Ti (alpha) phase of needle-shaped martensite was formed by fast cooling. The 6:4 ratio of phase alpha(2) to alpha of the composite coating provides optimal toughness and high hardness (680 HV). Under the testing up to 500 degrees C, the average friction coefficient of the composite coating is 0.22 +/- 0.011 and a 35% lower wear rate than that of Ti-6Al-4V substrate.

【 授权许可】

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