Materials Transactions Online

Materials Transactions, Vol.47 No.01 (2006) pp.106-111
© 2006 The Japan Institute of Metals

Microstructure and Characteristic of Laser Surface Alloyed Ni and Ni--Cr--B--Si on Al--Mg--Si Alloy

Yao-Chih Chuang1,, Shih-Chin Lee1 and Hsin-Chih Lin2

1Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan, R. O. China
2Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan, R. O. China

A 5 KW CO2 laser has been used to modify the surface microstructure of Al--Mg--Si aluminum alloy with pure Ni and Ni--Cr--B--Si powders. The experimental results indicate that a porosity-free zone can be generated after laser surface alloying (LSA). The Al3Ni particles were only observed in the LSA Ni sample. In the LSA Ni--Cr--B--Si sample, there are three regions indicated as surface region in the melt zone (region A), bottom region in the melt zone (region B), and amorphous phase in bottom region (region C) from the top to the bottom. In the region A, the Al3Ni particles are present and the Al3Ni2 particles distributed in the region B. The partial Al--Ni--Cr amorphous structures are dispersed in the region C. And, the AlNi and Al8Cr5 structures were observed in the interface of region B and C. The hardness of the LSA Ni--Cr--B--Si sample is sharply increased than Al-matrix and Ni specimen, specifically the amorphous structure in region C is about 18 times higher than the Al-matrix.

(Received 2005/9/22; Accepted 2005/11/10; Published 2006/1/15)

Keywords: laser surface alloying (LSA), nickel--chromium--boron--silicon powders, amorphous structure

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