Creep behaviour analysis of an oxide dispersion strengthened Ni3Al intermetallic material through the ñ model of dislocation-dispersoid interaction
Keywords:Creep, Ni3Al based alloys, Dispersion strengthened alloys
This research work presents an alternative description of the high temperature creep behaviour of an ordered oxide dispersion strengthened Ni3Al intermetallic material to that recently presented by Klotz et al following an Arzt and Gohring model. An apparent stress exponent, nap, of 7.8 and an apparent activation energy, Qap, of 697 kJ/mole was obtained for this material. These values are approximately double than those for the non reinforced material. The dislocation-dispersoid interaction model, termed "ñ model", considers that this interaction merely raises the stress exponent associated to the non reinforced matrix by a value of ñ. Consequently, the apparent activation energy value is simultaneously raised. The ñ model predicts accurately the experimental data and presents advantages for analysing the creep behaviour of the dispersion strengthened materials.
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How to Cite
Carreño, F., & Ruano, O. A. (1998). Creep behaviour analysis of an oxide dispersion strengthened Ni3Al intermetallic material through the ñ model of dislocation-dispersoid interaction. Revista De Metalurgia, 34(Extra), 206–210. https://doi.org/10.3989/revmetalm.1998.v34.iExtra.739
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