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Creep in Ternary B2 Aluminides and Other Intermetallic Phases

Published online by Cambridge University Press:  28 February 2011

I. Jung ,
M. Rudy  and
G. Sauthoff
I. Jung
Affiliation:
Max-Planck-Institut für Eisenforschung GmbH., D-4000 Düsseldorf, Federal Republic of Germany
M. Rudy
Affiliation:
Max-Planck-Institut für Eisenforschung GmbH., D-4000 Düsseldorf, Federal Republic of Germany
G. Sauthoff
Affiliation:
Max-Planck-Institut für Eisenforschung GmbH., D-4000 Düsseldorf, Federal Republic of Germany
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Abstract

This paper examines the possibilities for obtaining a high creep resistance in intermetallic phases. In a first section, the creep mechanisms are discussed with respect to the effects of stress, temperature and composition in the light of recent experimental results on the creep behaviour of the B2 phase (Fe,Ni) Al between 650 °C and 1100 °C. The familiar models for describing the creep of conventional disordered alloys apply to intermetallic phases, too, and describe the observed behaviour in a quantitative way. In the second section the creep of various ordered bcc phases - (Fe,Ni)Al and (Co,Ni)Al with B2 structure and the Heusler-type Ni2AlTi with L21 structure - and ordered fcc phases - Ni3Al with L12 structure, Fe3AlC and Ni3AlC with E21 structure and NbAl3 with DO22 structure - are examined. Large increases in creep strength are possible by the transition to phases with more complex structures as well as by appropriate alloying. Much further work is necessary for making more reliable predictions on the obtainable creep strengths.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 81: Symposium H – High-Temperature Ordered Intermetallic Alloys II , 1986 , 263
Copyright
Copyright © Materials Research Society 1987

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References

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