Abstract
AbstractThis 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 L21structure - and ordered fcc phases - Ni3Al with L12structure, Fe3AlC and Ni3AlC with E21structure and NbAl3with DO22structure - 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.
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