Amorphous structure and properties in laser-clad Ni-Cr-Al coating on Al-Si alloy

Gongying Liang; T. T. Wong; J. Y. Su; C. H. Woo

doi:10.1117/12.361092

8 September 1999 Amorphous structure and properties in laser-clad Ni-Cr-Al coating on Al-Si alloy

Gongying Liang, T. T. Wong, J. Y. Su, C. H. Woo

Proceedings Volume 3862, 1999 International Conference on Industrial Lasers; (1999) https://doi.org/10.1117/12.361092
Event: International Symposium on Industrial Lasers, 1999, Wuhan, China

Abstract

A Ni-Cr-Al coating was clad by a 5 kW CO₂ laser with different laser power on Al-Si alloy. Using transmission electron microscopy, a mixing microstructure containing Ni- based amorphous structures was observed in the laser clad zones. As the uniformity of chemical composition and temperature is poor in the laser cladding, the amorphous structure with some Ni₃Al crystals coexisted in the cladding. According to the morphologies of Ni-based amorphous structures, the amorphous structure existed not only in the net-like boundaries surrounding the granular structure but also in the granular structure. The microhardness of the mixture amorphous structure is between HV 600 - 800, which is lower than that of crystal phases in the coating. A differential thermal analysis showed that Ni- based amorphous structure exhibits a higher initial crystallizing temperature (about 588 degree(s)C), which is slightly higher than that of the eutectic temperature of Al- Si alloy. The wear experimental results showed that some amorphous structure exist in the laser cladding can reduce the peeling of the granular phases from matrix, and improve the its wear resistance.

Citation Download Citation

Gongying Liang, T. T. Wong, J. Y. Su, and C. H. Woo "Amorphous structure and properties in laser-clad Ni-Cr-Al coating on Al-Si alloy", Proc. SPIE 3862, 1999 International Conference on Industrial Lasers, (8 September 1999); https://doi.org/10.1117/12.361092

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