Thermal fatigue of NiAl single crystals
Single crystals of [001]-oriented NiAl single crystals were subjected to thermal fatigue by a method which employs induction heating of disk-shaped specimens heated in an argon atmosphere. Several time-temperature heating and cooling profiles were used to produce different thermal strain histories in specimens cycled between 973 K and 1,473 K. After thermal cycling, pronounced shape changes in the form of diametrical elongations along {l{underscore}angle}100{r{underscore}angle} directions with accompanying increases in thickness at and near the {l{underscore}angle}100{r{underscore}angle} specimen axes were observed. The deformations were analyzed in terms of operative slip systems in tension and compression, ratchetting (cyclic strain accumulation), and the elastic properties of NiAl. The experimental results correlate best with thermal stresses associated with the large elastic anisotropy of NiAl.
- Research Organization:
- Univ. of Michigan, Ann Arbor, MI (US)
- OSTI ID:
- 20001638
- Report Number(s):
- CONF-981104-; ISBN 1-55899-458-0; ISSN 1067-9995; TRN: IM0001%%75
- Resource Relation:
- Conference: High-Temperature Ordered Intermetallic Alloys VIII, Materials Research Society Symposium Proceedings, Boston, MA (US), 11/30/1998--12/03/1998; Other Information: PBD: 1999; Related Information: In: High-temperature ordered intermetallic alloys VIII. Materials Research Society symposium proceedings: Volume 552, by George, E.P.; Mills, M.J.; Yamaguchi, Masaharu [eds.], [600] pages.
- Country of Publication:
- United States
- Language:
- English
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