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Slip Transfer From γ ' to β Phase in A Ni-Al-Ti Alloy

Published online by Cambridge University Press:  01 January 1992

Rui Yang ,
John A. Leake  and
Robert W. Cahn
Rui Yang
Affiliation:
Cambridge University, Materials Science Department, Cambridge CB2 3QZ, United Kingdom.
John A. Leake
Affiliation:
Cambridge University, Materials Science Department, Cambridge CB2 3QZ, United Kingdom.
Robert W. Cahn
Affiliation:
Cambridge University, Materials Science Department, Cambridge CB2 3QZ, United Kingdom.
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Abstract

Two-phase alloys comprising γ'-Ni3(Al,Ti) and β-Ni(Al,Ti) deform in a non-homogeneous manner at room temperature. Plastic deformation initiates in the softer γ' phase, resulting in internal stresses which build up at the γ'/β phase boundaries. These stresses can be relieved by a number of mechanisms including cracking, void formation, and slip propagating across the boundary into the harder β phase. We have investigated the interaction between mobile dislocations and the γ’/β interface by TEM. We found that compatible deformation occurs at boundaries where a favourable orientation relationship exists between the adjoining phases. In particular, the γ'[011](111) dislocations can be injected into the β phase to become β[100](011) dislocations, leaving residual dislocations at the interfaces. The effect of phase distribution on the operation of this mechanism is analysed, and discussed in relation to the enhancement of ductility of the βphase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 489
Copyright
Copyright © Materials Research Society 1995

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References

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