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Antiphase Domains, Disordered Films and the Ductility of Ordered Alloys Based on Ni3Ai

Published online by Cambridge University Press:  28 February 2011

R. W. Cahn
R. W. Cahn*
Affiliation:
Cambridge University, Dept. of Materials Science & Metallurgy, Pembroke Street, Cambridge CB2 3QZ, England
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Abstract

In elements and intermetallic compounds alike, tensile ductility is favoured by a small spacing of obstacles to dislocation movement, whether these obstacles be grain boundaries or other structural features. The evidence for this generalisation is reviewed.

Antiphase domains (APD) form only when Tt is below the freezing temperature, Tf: this isa rule which has not hitherto been recognized. In Ni-Al, Tt < Tf when the Al content is less than ≈23.5at.%. APD's can serve as heterogeneous nuclei where films of disordered (γ) phase deposit. Domains, especially if decorated by γ films, are associated with enhanced ductility, and there is circumstantial evidence that the ductility is indeed caused by these microstructural features.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 81: Symposium H – High-Temperature Ordered Intermetallic Alloys II , 1986 , 27
Copyright
Copyright © Materials Research Society 1987

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References

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