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High temperature dispersion strengthening of NiAlA potential high temperature strengthening mechanism for alloys based on the intermetallic compound NiAl was investigated. This study forms part of an overall program at NASA Lewis Research Center for exploring the potential of alloys based on NiAl for high temperature applications. An alloy containing 2.26 at% Nb and produced by hot extrusion of blended powders was examined in detail using optical and electron microscopy. Interdiffusion between the blended Nb and NiAl powders results in the formation of intermediate phases. A fine dispersion of precipitates of a hexagonal, ordered NiAlNb phases in a matrix of NiAl can be produced and this results in strengthening of the alloy by interfering with dislocation motion at high temperature. These precipitates are, however, found to coarsen during the high temperature (1300 K) deformation at slow strain rates and this may impose some limitatioins on the use of this strengthening mechanism.
Document ID
19860013217
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Sherman, M.
(Case Western Reserve Univ. Cleveland, OH, United States)
Vedula, K.
(Case Western Reserve Univ. Cleveland, OH, United States)
Date Acquired
September 5, 2013
Publication Date
March 1, 1986
Subject Category
Metallic Materials
Report/Patent Number
NASA-CR-175073
NAS 1.26:175073
Accession Number
86N22688
Funding Number(s)
PROJECT: RTOP 505-63-01
CONTRACT_GRANT: NAG3-387
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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