Microplasticity and fatigue in a damage tolerant niobium aluminide intermetallic
Conference
·
OSTI ID:293104
- Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering
- Univ. of Akron, OH (United States). Dept. of Mechanical Engineering
- General Electric Aircraft Engines, Cincinnati, OH (United States)
In this paper, the micromechanisms of microplasticity and fatigue are elucidated for a damage tolerant niobium aluminide intermetallic deformed to failure under both monotonic and cyclic loading. Localized microplasticity is shown to occur by the formation of slip bands at stresses as low as 9% of the bulk yield stress. Formation and presence of slip bands is also observed upon application of the first cycle of fatigue load. The deformation and cracking phenomena are discussed in light of classical fatigue crack initiation and propagation models. The implications of microplasticity are elucidated for both fatigue crack initiation and crack growth.
- Sponsoring Organization:
- Office of Naval Research, Washington, DC (United States)
- OSTI ID:
- 293104
- Report Number(s):
- CONF-970980--; ISBN 0-87339-382-1
- Country of Publication:
- United States
- Language:
- English
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