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Damage accumulation and cyclic fatigue in Mg-PSZ at Hertzian contacts

Published online by Cambridge University Press:  03 March 2011

Antonia Pajares ,
Lanhua Wei ,
Brian R. Lawn  and
David B. Marshall
Antonia Pajares*
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg. Maryland 20899
Lanhua Wei*
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg. Maryland 20899
Brian R. Lawn
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg. Maryland 20899
David B. Marshall
Affiliation:
Rockwell International Science Center, 1049 Camino Dos Rios, Thousand Oaks, California 91360
*
a)Guest Scientist, from Departamento de Física, Universidad de Extremadura. 06071-Badajoz, Spain.
b)Guest Scientist, from Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201.
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Abstract

Hertzian contact damage in as-fired, peak-aged, and over-aged Mg-PSZ is studied, in single-cycle and multiple-cycle loading. Indentation stress-strain curves reveal a monotonically increasing quasi-plasticity component in the contact deformation with increasing aging time. A bonded-interface technique is used to obtain surface and subsurface views of the damage zones beneath the spherical indenter. Analytical techniques, including optical and scanning electron microscopy, acoustic emission, Raman spectroscopy, and thermal wave imaging, are used to characterize the damage. The damage patterns are fundamentally different in the three aging states: microfracture dominated in as-fired; tetragonal-monoclinic phase-transformation-dominated in peak-aged; monoclinic-phase twinning-dominated in over-aged. The damage accumulates with increasing number of cycles, most strongly in the as-fired state. It also increases with increasing test duration in the as-fired and over-aged states, but not perceptibly in the peak-aged. The results imply predominantly mechanical fatigue effects, augmented by a chemical component in the as-fired and over-aged states. Broader implications in relation to the susceptibilities of zirconia ceramics to fatigue degradation in concentrated stress configurations, with special relevance to the evolution of flaws at the microstructural level, are considered.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 10 , October 1995 , pp. 2613 - 2625
Copyright
Copyright © Materials Research Society 1995

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