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An overview of using small punch testing for mechanical characterization of MCrAlY bond coats

Chen, Hao; Jackson, G.A.; Sun, Wei

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Hao Chen

G.A. Jackson

Wei Sun


Considerable work has been carried out on overlay bond coats in the past several decades because of its excellent oxidation resistance and good adhesion between the top coat and superalloy substrate in the thermal barrier coating systems. Previous studies mainly focus on oxidation and diffusion behavior of these coatings. However, the mechanical behavior and the dominant fracture and deformation mechanisms of the overlay bond coats at different temperatures are still under investigation. Direct comparison between individual studies has not yet been achieved due to the fragmentary data on deposition processes, microstructure and, more apparently, the difficulty in accurately measuring the mechanical properties of thin coatings. One of the miniaturized specimen testing methods, small punch testing, appears to have the potential to provide such mechanical property measurements for thin coatings. The purpose of this paper is to give an overview of using small punch testing to evaluate material properties and to summarize the available mechanical properties that include the ductile-to-brittle transition and creep of MCrAlY bond coat alloys, in an attempt to understand the mechanical behavior of MCrAlY coatings over a broad temperature range.

Journal Article Type Article
Acceptance Date Jun 26, 2017
Online Publication Date Jul 5, 2017
Publication Date Aug 1, 2017
Deposit Date Jul 21, 2017
Publicly Available Date Jul 21, 2017
Journal Journal of Thermal Spray Technology
Print ISSN 1059-9630
Electronic ISSN 1544-1016
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 26
Issue 6
Pages 1222-1238
Keywords creep; ductile-to-brittle transition; mechanical testing; MCrAlY bond coat; small punch
Public URL
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Additional Information The final publication is available at Springer via


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