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Influence of processing on the microstructure and mechanical properties of a NbAl3-base alloy

Published online by Cambridge University Press:  31 January 2011

Mohan G. Hebsur ,
Ivan E. Locci ,
S.V. Raj  and
Michael V. Nathal
Mohan G. Hebsur
Affiliation:
Sverdrup Technology Inc., LeRC Group, Brook Park, Ohio 44142
Ivan E. Locci
Affiliation:
NASA-Lewis Research Center, 21000 Brookpark Road, Cleveland, Ohio 44135
S.V. Raj
Affiliation:
NASA-Lewis Research Center, 21000 Brookpark Road, Cleveland, Ohio 44135
Michael V. Nathal
Affiliation:
NASA-Lewis Research Center, 21000 Brookpark Road, Cleveland, Ohio 44135
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Abstract

A multiphase oxidation resistant composition (Nb–67Al–7Cr–0.5Y–0.25W) based on NbAl3 was prepared by both induction melting and rapid solidification processing (RSP), followed by grinding to 75 μm powder and consolidating by powder metallurgy techniques (hot pressing, hot isostatic pressing, and Ceracon pressing). Constant strain rate compression tests conducted on consolidated materials in the temperature range 300–1300 K indicated that the RSP material exhibited significantly higher strength and ductility than the induction melted alloy up to 1200 K. Bend strengths measured on induction melted material were significantly lower than the corresponding compressive strengths, suggesting the brittle, flaw-sensitive nature of this alloy. The NbAlCrYW alloy exhibits a brittle-to-ductile transition around 1000 K. The constant load creep tests conducted on the induction melted alloy in the 1200–1300 K temperature range indicated that this alloy shows a power law creep dependency with a stress exponent, n, of 3.2. It was found that the specific strength of this alloy is competitive with other aluminide intermetallics.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 7 , July 1992 , pp. 1696 - 1706
Copyright
Copyright © Materials Research Society 1992

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