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Microstructure and mechanical properties of multiphase NiAl-based alloys

Published online by Cambridge University Press:  31 January 2011

D.R. Panka ,
M.V. Nathal  and
D.A. Koss
D.R. Panka
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
M.V. Nathal
Affiliation:
NASA Lewis Research Center, Cleveland, Ohio 44135
D.A. Koss
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
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Abstract

The effect of the γ′ phase on the deformation behavior fracture resistance of melt-spun ribbons and consolidated bulk specimens of a series of NiAl-based alloys with Co and Hf additions has been examined. The morphology, location, and volume fraction of the γ′ phase are significant factors in enhancing the fracture resistance of the normally brittle NiAl-based alloys. In particular, the results indicate that a continuous grain boundary film of γ′ can impart limited room temperature ductility regardless of whether B2 or L10 NiAl is present. Guidelines for microstructure control in multi-phase NiAl-based alloys are also presented.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 5 , May 1990 , pp. 942 - 949
Copyright
Copyright © Materials Research Society 1990

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