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Effects of Rhenium Alloying on the Microstructures and Mechanical Properties of Directionally Solidified NiAl-Mo Eutectic Alloy

Published online by Cambridge University Press:  15 February 2011

A. Misra ,
Z. L. Wu  and
R. Gibala
A. Misra
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109–2136.
Z. L. Wu
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109–2136.
R. Gibala
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109–2136.
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Abstract

Low ductility of the reinforcing bcc metal phase at room temperature and weak interfaces can limit the intrinsic toughness and ductility of NiAl-bcc metal eutectic composites. The potential of rhenium (Re) addition, which is known to solid solution soften and lower the ductile-to-brittle transition temperature of various bcc metals, to enhance the ductility and toughness of a directionally solidified NiAl-9 at.% Mo eutectic alloy was investigated. Re partitioned to the bcc metal phase and formed a substitutional solid solution. The interface morphology was changed from a faceted to a non-faceted one. Re alloying caused softening of the Mo fibers, and as a result NiAl-Mo(Re) alloys were softer in compression and flexure and had ∼20% higher fracture toughness values as compared to the transverse orientation toughness of NiAl-9Mo alloy. The toughness of the NiAl-Mo(Re) alloys was lower man the longitudinal orientation toughness of the NiAl-9Mo alloy due to the poor alignment of the Mo(Re) phase with the growth direction. The toughening mechanisms have been evaluated and schemes for processing NiAl-Mo(Re) alloys for higher toughness in the longitudinal orientation are suggested. The role of the residual interstitial impurities and partitioning of Ni and Al to Mo fibers on the mechanical properties are highlighted.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 743
Copyright
Copyright © Materials Research Society 1997

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