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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4077

Title: Laser alloying of AI with mixed Ni, Ti and SiC powders
Authors: Mabhali, L
Pityana, S
Sacks, N
Keywords: Laser alloying
Surface hardeness
Powders
Aluminium
Optics
4th PICALO 2010
Issue Date: Mar-2010
Publisher: PICALO 2010
Citation: Mabhali, L, Pityana, S and Sacks, N. 2010. Laser alloying of AI with mixed Ni, Ti and SiC powders. 4th Pacific International Conference on Applications of Lasers and Optics (PICALO), Shangri-La Hotel (Wuhan, Peoples Republic of China), 23-25 March 2010, pp 6
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 aluminum 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: 4th Pacific International Conference on Applications of Lasers and Optics (PICALO), Shangri-La Hotel (Wuhan, Peoples Republic of China), 23-25 March 2010
URI: http://hdl.handle.net/10204/4077
Appears in Collections:Laser materials processing
Metal and metal processes
Manufacturing science and technology
General science, engineering & technology

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