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The Role of Interfaces in the Room Temperature Mechanical Behavior of Directionally Solidified β+ γ- Ni70Al30 and β+ (γ+γ)- Ni50Fe30Al20 Alloys

Published online by Cambridge University Press:  01 January 1992

A. Misra ,
R.D. Noebe  and
R. Gibala
A. Misra
Affiliation:
Department of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109-2136
R.D. Noebe
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135.
R. Gibala
Affiliation:
Department of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109-2136
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Abstract

We have shown previously that directionally solidified β+γ-Ni70Al30 and β+(γ+γ)-Ni50Fe30Al20 alloys with quasi-lamellar microstructures exhibit up to 10% tensile ductility at 300 K. The ductility enhancement was partly attributed to a slip transfer mechanism which is favored by the Kurdjumov-Sachs orientation relationship and strong interphase interface that shows no debonding. The slip systems in the β phase were of the type {110}<001> even though the loading axis was parallel to the <001> growth direction in β. In the present investigation, an electron microscopy study of the β / γ and β / (γ + γ) interfaces has been conducted to understand the interfacial structure and its relation to room temperature mechanical properties. Furthermore, the stress concentration at the interface is treated analytically to understand how {110}<001> slip occurs in the β phase, even though the loading axis is along <001>.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 483
Copyright
Copyright © Materials Research Society 1995

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References

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