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research article

Deformation microstructures in Ni-3(Al, Hf)

Kruml, T.
•
Martin, J. L.
•
Viguier, B.
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1997
Materials Science and Engineering A -Structural Materials Properties Microstructure and Processing

The dislocation structures resulting from compression tests on Ni-3 (Al, I-If) single crystals are studied as a function of the deformation temperature between 77 and 900 K. Mechanical parameters are also reported, such as the 0.2% offset stress, the work-hardening coefficient, the microscopic activation volume and the dislocation exhaustion rate. The two latter parameters are measured using repeated load relaxation experiments. It is shown that the microstructural features are qualitatively similar to those reported for other Ni3Al compounds: Kear Wilsdorf locks are observed in the temperature domain which corresponds to the strength anomaly, the peak temperature seems to be associated with the occurrence of cube slip. Therefore, the spectacular strengthening due to I-If additions is discussed in terms of other parameters of the dislocation structure such as the complex stacking fault energy. (C) 1997 Elsevier Science S.A.

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Type
research article
DOI
10.1016/S0921-5093(97)00578-9
Web of Science ID

WOS:000071868000024

Author(s)
Kruml, T.
Martin, J. L.
Viguier, B.
Bonneville, J.
Spätig, P.
Date Issued

1997

Published in
Materials Science and Engineering A -Structural Materials Properties Microstructure and Processing
Volume

240

Start page

174

End page

179

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

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Available on Infoscience
April 16, 2008
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/21445
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