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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4823

Title: Laser alloying of Al with mixed Ni, Ti and SiC powders
Authors: Mabhali, L
Pityana, S
Sacks, N
Keywords: Laser alloying
Chemical engineering
Silicon carbide
Metal matrix composite
Intermetallic phases
Laser applications
Issue Date: Nov-2010
Publisher: Laser Institute of America
Citation: Mabhali, L, Pityana, S and Sacks, N. 2010. Laser alloying of Al with mixed Ni, Ti and SiC powders. Journal of Laser Applications, 22(4), pp 121-126.
Series/Report no.: Journal Article;
Abstract: Laser alloying of aluminium AA1200 was performed with a 4.4kW Rofin Sinar Nd:YAG laser to improve the surface hardness. Alloying was carried out by depositing Ni, Ti and SiC powders of different weight ratios on the aluminium substrate. The aim was to form surfaces on aluminium reinforced with metal matrix composites and intermetallic phases. The laser parameters used were 4kW power and 10mm/s laser scanning speed. The microstructures formed were examined using optical and scanning electron microscopes and the phases were identified with XRD and EDX analytical techniques. Preliminary results showed that the microstructure of the alloyed layer depends on the content of Ni, Ti and SiC in the deposited powder mixture. The distribution of the SiC particles was not homogeneous. Intermetallic phases were formed between Al-Ni-Ti-SiC during laser alloying. An increase in surface hardness was achieved after laser alloying. A surface hardness of approximately 356.8±43.4 HV0.1 was achieved after alloying with a powder containing 70wt%Ni, 20wt%Ti and 10wt%SiC. The increase in hardness was attributed to the formation of the intermetallic phases.
Description: Copyright: 2010 Laser Institute of America. This is the pre print version of the work. The definitive version is published in Laser alloying of Al with mixed Ni, Ti and SiC powders, Vol 22(4), pp 121-126
URI: http://hdl.handle.net/10204/4823
ISSN: 1042-346X
Appears in Collections:Laser materials processing
General science, engineering & technology

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