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High temperature creep transitions in single crystalline Ni3Al(Ta, B)

Published online by Cambridge University Press:  03 March 2011

J. Wolfenstine ,
H.K. Kim  and
J.C. Earthman
J. Wolfenstine
Affiliation:
Materials Section, Department of Mechanical and Aerospace Engineering, University of California, Irvine, California 92717
H.K. Kim
Affiliation:
Materials Section, Department of Mechanical and Aerospace Engineering, University of California, Irvine, California 92717
J.C. Earthman
Affiliation:
Materials Section, Department of Mechanical and Aerospace Engineering, University of California, Irvine, California 92717
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Abstract

The high temperature (T = 1083–1388 K, 0.65–0.84 Tm) creep behavior of single crystalline Ni3Al(Ta, B) was investigated. A change in the creep characteristics as a function of applied stress was observed at the uppermost testing temperatures of 1288 and 1388 K. At low applied stress levels the Norton law stress exponent is equal to 4.3; for higher stresses the stress exponent is equal to 3.2. Different creep curves were observed, depending on the value of the stress exponent. The change in stress exponent and nature of the creep curve correspond to a change in the controlling deformation mechanism from dislocation climb to viscous dislocation glide for Ni3Al(Ta, B). The experimentally observed transition stress values between climb and viscous glide are in good agreement with values predicted from theory, assuming that the major force retarding viscous dislocation glide in Ni3Al(Ta, B) is the antiphase boundary interaction.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 10 , October 1993 , pp. 2510 - 2514
Copyright
Copyright © Materials Research Society 1993

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References

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