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Quasicrystalline Coatings Through Laser Processing: A Study on Process Optimisation and Microstructure Evolution

Published online by Cambridge University Press:  17 March 2011

K. Chattopadhyay ,
K. Biswas ,
S. Bysakh ,
G. Phanikumar ,
A. Weisheit ,
R. Galun  and
B. Mordike
K. Chattopadhyay
Affiliation:
Department of Metallurgy Indian Institute of Science Bangalore 560012, India
K. Biswas
Affiliation:
Department of Metallurgy Indian Institute of Science Bangalore 560012, India
S. Bysakh
Affiliation:
Department of Metallurgy Indian Institute of Science Bangalore 560012, India
G. Phanikumar
Affiliation:
Department of Metallurgy Indian Institute of Science Bangalore 560012, India
A. Weisheit
Affiliation:
IWW, Technical University of Clausthal Clausthal-Zellerfeld, Germany
R. Galun
Affiliation:
IWW, Technical University of Clausthal Clausthal-Zellerfeld, Germany
B. Mordike
Affiliation:
IWW, Technical University of Clausthal Clausthal-Zellerfeld, Germany
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Abstract

Composite coatings containing quasicrystalline (QC) phases in Al-Cu-Fe alloys were prepared by laser cladding using a mixture of the elemental powders. Two substrates, namely pure aluminum and an Al-Si alloy were used. The clad layers were remelted at different scanning velocities to alter the growth conditions of different phases. The process parameters were optimized to produce quasicrystalline phases. The evolution of the microstructure in the coating layer was characterized by detailed microstructural investigation. The results indicate presence of quasicrystals in the aluminum substrate. However, only approximant phase could be observed in the substrate of Al-Si alloys. It is shown that there is a significant transport of Si atoms from the substrate to the clad layer during the cladding and remelting process. The hardness profiles of coatings on aluminum substrate indicate a very high hardness. The coating on Al-Si alloy, on the other hand, is ductile and soft. The fracture toughness of the hard coating on aluminum was obtained by nano-indentation technique. The K1C value was found to be 1.33 MPa m1/2 which is typical of brittle materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 643: Symposium K – Quasicrystals-Preparation, Properties, and Applications , 2000 , K15.3
Copyright
Copyright © Materials Research Society 2001

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