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Ductility Enhancement from Interface Dislocation Sources in a Directionally Solidified β (γ + γ′) Ni-Fe-Al Composite Alloy.

Published online by Cambridge University Press:  21 February 2011

M. Larsen ,
A. Misra ,
S. Hartfield-Wunsch ,
R. Noebe  and
R. Gibala
M. Larsen
Affiliation:
Dept. of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109.
A. Misra
Affiliation:
Dept. of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109.
S. Hartfield-Wunsch
Affiliation:
Dept. of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109.
R. Noebe
Affiliation:
Dept. of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109.
R. Gibala
Affiliation:
Dept. of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109.
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Abstract

A directionally solidified β + (γ + γ′) Ni-Fe-AI in-situ composite alloy of composition Ni50Fe30Al20 (at.%) has been used to investigate the effect of a plastically soft second phase on the mechanical behavior of a B2 ordered intermetallic alloy. This material exhibits extensive plasticity during compressive deformation at room temperature and fails in shear with extensive γ + γ′ lamellar or rod pull-out. The material also exhibits ∼10% tensile elongation to fracture at room temperature, with final fracture that includes substantial necking of the γ + γ′ lamellae or rods. Observation of slip lines and dislocation substructures discloses that the normally brittle β matrix undergoes extensive plasticity in order to deform compatibly with the more ductile γ phase. The plasticity of the β matrix is accomplished by the generation of glissile dislocations into the β matrix from the β/γ interface region and is enhanced because of a favorable β - γ orientation relationship for slip transfer. Ductility enhancement from interface-generated mobile dislocations generated from β-γ interfaces is compared to that observed in film-coated β-NiAl single crystals and FeAl polycrystals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990 , 191
Copyright
Copyright © Materials Research Society 1990

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