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Effects of Glass-Forming Metallic Film on the Fatigue Behavior of C-2000 Ni-Based Alloy

Published online by Cambridge University Press:  26 February 2011

F. X. Liu ,
C. L. Chiang ,
J. P. Chu ,
Y. F. Gao  and
P. K. Liaw
F. X. Liu
Affiliation:
[email protected], The University of Tennessee, Department of Materials Science and Engineering, 434 Dougherty Hall, Knoxville, Tennessee, 37996, United States
C. L. Chiang
Affiliation:
[email protected], National Taiwan Ocean University, Institute of Materials Engineering, Taiwan
J. P. Chu
Affiliation:
[email protected], National Taiwan Ocean University, Institute of Materials Engineering, Taiwan
Y. F. Gao
Affiliation:
[email protected], The University of Tennessee, Materials Science and Engineering
P. K. Liaw
Affiliation:
[email protected], The University of Tennessee, Materials Science and Engineering
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Abstract

Glass-forming Zr47Cu31Al13Ni9 (in atomic percent) films of various thicknesses were deposited on the C-2000 Ni-based alloy substrate by magnetron sputtering. Four-point-bending fatigue tests were conducted on the above system with the coated surface on the tensile side. It has been found that both fatigue life and fatigue-endurance limit can be considerably improved, while the degree of fatigue resistance enhancement depends on the maximum applied stress and the film thickness. Mechanisms of fatigue-resistance enhancements of the coated Ni-based alloy are discussed from the following aspects: reduction of surface roughness by the thin-film coating, good adhesion between thin film and substrate, development of residual compressive stress, and excellent ductility of glass-forming thin film (which would be otherwise brittle in bulk form). Of particular interest, we examine the interaction of substrate slip bands and the thin film ductile property, which would delay fatigue crack initiation process and thus extend the fatigue life.

Keywords

filmfatigueNi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 903: Symposium Z – Amorphous and Nanocrystalline Metals for Structural Applications , 2005 , 0903-Z14-13
Copyright
Copyright © Materials Research Society 2006

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