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An Assessment of the Mechanical Strengths of Aluminide-based Thin Coatings

Published online by Cambridge University Press:  17 March 2011

S.Y. Li ,
H.P. Ng  and
Alfonso H.W. Ngan
S.Y. Li
Affiliation:
The University of Hong Kong, Department of Mechanical Engineering, Pokfulam Road, Hong Kong, P.R. CHINA
H.P. Ng
Affiliation:
The University of Hong Kong, Department of Mechanical Engineering, Pokfulam Road, Hong Kong, P.R. CHINA
Alfonso H.W. Ngan
Affiliation:
The University of Hong Kong, Department of Mechanical Engineering, Pokfulam Road, Hong Kong, P.R. CHINA
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Abstract

Titanium aluminide and nickel aluminide-based thin coatings were synthesized by magnetron sputtering from intermetallic TiAl and Ni3Al alloy targets on nickel substrates. Both types of aluminide coatings exhibited high surface hardness values that varied with the degree of heat treatment. The hardness of the coatings was investigated using micro- and nano- indentation techniques. In order to estimate the intrinsic strength of the films, the indentation size effects of the apparent hardness were analyzed by the Jönsson-Hogmark model and a model recently proposed by the authors. The analysis indicated that the strengths of the aluminide coatings may considerably exceed their strengths in bulk.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 649: Symposium Q – Fundamentals of Nanoindentation & Nanotribology II , 2000 , Q8.11
Copyright
Copyright © Materials Research Society 2001

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References

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