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Toughness and Subcritical Crack Growth in Nb/Nb3Al Layered Materials

Published online by Cambridge University Press:  10 February 2011

D. R. Bloyer ,
K. T. Venkateswara Rao  and
R. O. Ritchie
D. R. Bloyer
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720-1760
K. T. Venkateswara Rao
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720-1760
R. O. Ritchie
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720-1760
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Abstract

A brittle intermetallic, Nb3Al, reinforced with a ductile metal, Nb, has been used to investigate the resistance curve and cyclic fatigue behavior of a relatively coarse laminated composite. With this system, the toughness of Nb3Al was found to increase from ∼1 MPa√m to well over 20 MPa√m after several millimeters of stable crack growth; this was attributed to extensive crack bridging and plastic deformation within the Nb layers in the crack wake. Cyclic fatigue-crack growth resistance was also improved in the laminate microstructures compared to pure Nb3Al and Nb-particulate reinforced Nb3Al composites with crack arrester orientations in the laminate providing better fatigue resistance than either the matrix or pure Nb.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 434: Symposium U – Layered Materials for Structural Applications , 1996 , 243
Copyright
Copyright © Materials Research Society 1996

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