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The Creep Behavior of Cr Modified Ni3 Al Single Crystals

Published online by Cambridge University Press:  26 February 2011

S. E. Hsu ,
C. H. Tong ,
T. S. Lee  and
T. S. Liu
S. E. Hsu
Affiliation:
Chung Shan Institute of Science and Technology P.O.BOX 90008-8, Lung-Tan, Taiwan 32526, R.O.C.
C. H. Tong
Affiliation:
Chung Shan Institute of Science and Technology P.O.BOX 90008-8, Lung-Tan, Taiwan 32526, R.O.C.
T. S. Lee
Affiliation:
Chung Shan Institute of Science and Technology P.O.BOX 90008-8, Lung-Tan, Taiwan 32526, R.O.C.
T. S. Liu
Affiliation:
Chung Shan Institute of Science and Technology P.O.BOX 90008-8, Lung-Tan, Taiwan 32526, R.O.C.
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Abstract

Ni-Al-Cr single crystals with 4 at% Cr and different levels of aluminum content are grown in a directional solidification facility. The crystals are creep tested at temperatures from 760°C to 860°C. Steady state, as well as transient, creep rates are measured. The results show that Cr modified Ni3 A1, when tested along the <100> direction, exhibit remarkably high values of activation energy for creep. Along with evidence from dislocation structures, it is likely that there is a change in the dislocation core structure upon Cr addition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 275
Copyright
Copyright © Materials Research Society 1989

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References

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