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Journal of the Southern African Institute of Mining and Metallurgy

On-line version ISSN 2411-9717
Print version ISSN 0038-223X

J. S. Afr. Inst. Min. Metall. vol.111 n.5 Johannesburg May. 2011




Quantitative study of the hardness property of laser surface alloyed aluminium AA1200



A.P.I. PopoolaI; S.L. PityanaI, II; T. FedotovaI; O.M. PopoolaI

ITshwane University of Technology, Pretoria, South Africa
IICenter for Scientific and Industrial Research-National Laser Centre, Pretoria, South Africa




Aluminium AA1200 was laser alloyed with a combination of nickel and titanium diboride using different weight ratios. Chemical reactions took place with the formation of different phases. The characterization of the alloyed surfaces was carried out by x-ray diffraction (XRD), optical and scanning electron microscopes. The alloyed surfaces are composed of the initial phase of Al-Ni dendrites and eutectics of TiB2/Al and TiB2/Ni distributed on the initial phase. Experimental results obtained showed that Al-Ni intermetallics brought about a significant increase in the hardness property of Al; however, these intermetallics are highly brittle and prone to fail by brittle fracture or stress corrosion cracking when put in service. The addition of TiB2 brought about a reduction in the formation of these intermetallic phases. A microhardness increase of over 10 times the hardness of the substrate was achieved.

Keywords: Dendrites, intermetallics, metal composite, Nd: YAG laser



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