Toughness and subcritical crack growth in Nb/Nb{sub 3}Al layered materials
Book
·
OSTI ID:490780
- Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering
A brittle intermetallic, Nb{sub 3}Al, 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 Nb{sub 3}Al was found to increase from {approximately}1 MPa{radical}m to well over 20 MPa{radical}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 Nb{sub 3}Al and Nb-particulate reinforced Nb{sub 3}Al composites with crack arrester orientations in the laminate providing better fatigue resistance than either the matrix or pure Nb.
- Sponsoring Organization:
- Department of the Air Force, Washington, DC (United States)
- OSTI ID:
- 490780
- Report Number(s):
- CONF-960401--; ISBN 1-55899-337-1
- Country of Publication:
- United States
- Language:
- English
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