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Title: Microstructure and wear-resistance of in-situ synthetic intermetallic compound modification coating formed on Al alloy substrate by laser alloying
Authors: Zhang, S
Zhang, CH
Man, HC 
Liu, CS
Cai, QK
Keywords: Aluminium alloy
Intermetallic compounds
Laser surface alloying
Issue Date: 2005
Publisher: 中國學術期刊(光盤版)電子雜誌社
Source: 摩擦學學報 (Tribology), 2005, v. 25, no. 2, p. 97-101 How to cite?
Journal: 摩擦學學報 (Tribology) 
Abstract: The surface modification coating composed of Ti-Al and Ni-Al intermetallic compounds was fabricated on 6061 Al substrate using a high-power continuous wave Nd-YAG laser, by means of laser surface alloying of NiTi powders as the raw material. The microstructure, surface morphology, composition distribution, hardness profile, and wear-resistance of the surface alloying coating were analyzed using X-ray diffraction, scanning electron microscopy, microhardness measurement, and friction and wear test. It was found that the NiTi powders were successfully alloyed onto the aluminium alloy surface by way of overlapping single track at the optimal process parameters, and the resulting surface alloying coating had good metallurgical bonding with the Al alloy substrate. The surface alloy coating was compact and free of crack, and it was mainly composed of TiAl3 and Ni3Al intermetallic compounds dendrites. The hardness of the laser-alloyed surface was 3 to 5 times as much as that of the A16061 alloy substrate, while its wear-resistance was dramatically increased than the 6061A1 substrate.
ISSN: 1004-0595
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