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Creep and toughness of cryomilled NiAl containing Cr

Published online by Cambridge University Press:  31 January 2011

J. Daniel Whittenberger ,
Beverly Aikin  and
Jon Salem
J. Daniel Whittenberger
Affiliation:
NASA-Glenn Research Center, Cleveland, Ohio 44135
Beverly Aikin
Affiliation:
Case Western Reserve University at NASA-Glenn Research Center, Cleveland, Ohio 44135
Jon Salem
Affiliation:
NASA-Glenn Research Center, Cleveland, Ohio 44135
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Abstract

NiAl–AlN + Cr composites were produced by blending cryomilled NiAl powder with approximately 10 vol% Cr flakes. In comparison to the as-consolidated matrices, hot isostatically pressed Cr-modified materials did not demonstrate any significant improvement in toughness. Hot extruded NiAl–AlN + 10.5Cr, however, possessed a toughness twice that determined for the base NiAl–AlN alloy. Measurement of the 1200 to 1400 K plastic flow properties revealed that the strength of the composites was completely controlled by the properties of the NiAl–AlN matrices. This behavior could be successfully modeled by the Rule-of-Mixtures, where load is shed from the weak Cr to the strong matrix.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 5 , May 2001 , pp. 1333 - 1344
Copyright
Copyright © Materials Research Society 2001

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