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Thermal Fatigue of NiAl Single Crystals

Published online by Cambridge University Press:  10 February 2011

M. T. Kush ,
J. W. Holmes  and
R. Gibala
M. T. Kush
Affiliation:
Present address: Rolls-Royce, P.O. Box 420, Speed Code 0–2, Indianapolis, IN 46206–0420
J. W. Holmes
Affiliation:
The University of Michigan, Department of Mechanical Engineering and Applied Mechanics, Ann Arbor, MI 48109–2125
R. Gibala
Affiliation:
The University of Michigan, Department of Materials Science and Engineering, Ann Arbor, MI 481092136
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Abstract

Single crystals of [001]-oriented NiAI 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 1473 K. After thermal cycling, pronounced shape changes in the form of diametrical elongations along <100> directions with accompanying increases in thickness at and near the <100> 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK8.4.1
Copyright
Copyright © Materials Research Society 1999

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References

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