Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31762
Title: Cavitation erosion and corrosion behaviour of laser surface alloyed MMC of SiC and Si3N4 on Al alloy AA6061
Authors: Man, HC 
Kwok, CT
Yue, TM 
Keywords: Aluminum alloy
Laser
Si3N4
SiC
Issue Date: 2000
Publisher: Elsevier
Source: Surface and coatings technology, 2000, v. 132, no. 1, p. 11-20 How to cite?
Journal: Surface and coatings technology 
Abstract: Laser surface alloying of SiC/Si3N4 on AA6061 aluminium alloy was carried out using a 2-kW CW Nd-YAG laser. Different ratios of SiC and Si3N4 powders were mixed and the layers were preplaced by pasting. Subsequent laser surface melting of the layers gave a surface metal matrix composite (MMC). The microstructure, chemical compositions and phase identification of the modified layers were examined using scanning electron microscopy (SEM), energy disperse X-ray spectroscopy (EDX) and X-ray diffractometry (XRD), respectively. The laser surface alloyed MMCs of AA6061-SiC and AA6061-Si3N4 consisted of small amounts of Al4C3/Al4SiC4 and A1N, respectively. For specimens alloyed with 100% Si3N4 (AA6061-Si3N4), the cavitation erosion resistance R(e) was improved by three times as compared to the AA6061 alloy whereas there was no significant improvement in R(e) of the specimen alloyed with 100% SiC (AA6061-SiC). The surface hardness of the specimens alloyed with SiC/Si3N4 was increased seven times. All the laser alloyed specimens with SiC/Si3N4 showed a decrease in pitting resistance and absence of passivity owing to the aluminium-ceramic interfaces, which favour pit initiation or hindered passivity.
URI: http://hdl.handle.net/10397/31762
ISSN: 0257-8972
EISSN: 1879-3347
DOI: 10.1016/S0257-8972(00)00729-5
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