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Discontinuously reinforced intermetallic matrix composites via XD synthesisA review is given of recent results obtained for discontinuously reinforced intermetallic matrix composites produced using the XD process. Intermetallic matrices investigated include NiAl, multiphase NiAl + Ni2AlTi, CoAl, near-gamma titanium aluminides, and Ll2 trialuminides containing minor amounts of second phase. Such mechanical properties as low and high temperature strength, compressive and tensile creep, elastic modulus, ambient ductility, and fracture toughness are discussed as functions of reinforcement size, shape, and volume fraction. Microstructures before and after deformation are examined and correlated with measured properties. An observation of interest in many of the systems examined is 'dispersion weakening' at high temperatures and high strain rates. This behavior is not specific to the XD process; rather similar observations have been reported in other discontinuous composites. Proposed mechanisms for this behavior are presented.
Document ID
19920059243
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kumar, K. S.
(Martin Marietta Laboratories Baltimore, MD, United States)
Whittenberger, J. D.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1992
Publication Information
Publication: Materials Science and Technology
Volume: 8
Issue: 4 Ap
ISSN: 0267-0836
Subject Category
Composite Materials
Accession Number
92A41867
Funding Number(s)
CONTRACT_GRANT: N00014-86-C-2277
CONTRACT_GRANT: NAS3-25787
CONTRACT_GRANT: MDA972-88-C-0047
CONTRACT_GRANT: N00014-85-C-0639
Distribution Limits
Public
Copyright
Other

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