Broad-beam laser cladding of Al–Cu alloy coating on AZ91HP magnesium alloy

The resistance to wear and corrosion of AZ91HP Mg alloy was improved by laser cladding Al–Cu alloy. It was found that the clad layer was characterized by AlCu 4 and Mg 17Al 12 grains embedded in a AlMg matrix. The bonding zone exhibited a white-light planar crystal band with thickness of 10–13 μm. T...

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Veröffentlicht in:	Applied surface science 2007-03, Vol.253 (11), p.4917-4922
Hauptverfasser:	Gao, Yali, Wang, Cunshan, Pang, Hongjie, Liu, Hongbin, Yao, Man
Format:	Artikel
Sprache:	eng
Schlagworte:	Al–Cu alloy Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Exact sciences and technology Laser cladding Magnesium alloy Microstructure Physics Property
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Zusammenfassung:	The resistance to wear and corrosion of AZ91HP Mg alloy was improved by laser cladding Al–Cu alloy. It was found that the clad layer was characterized by AlCu 4 and Mg 17Al 12 grains embedded in a AlMg matrix. The bonding zone exhibited a white-light planar crystal band with thickness of 10–13 μm. The heat-affected zone formed a eutectic structure due to the Mg diffusion. The microhardness and wear resistance of the coating were improved due to the formation of the hard phases AlCu 4 and Mg 17Al 12. Owing to the formation of dense Al 2O 3 oxide film, the coating exhibited better corrosion resistance in 3.5 wt.% NaCl solution.
ISSN:	0169-4332 1873-5584
DOI:	10.1016/j.apsusc.2006.10.075