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This research work presents an alternative description of the high temperature creep behaviour of an ordered oxide dispersion strengthened Ni 3 Al intermetallic material to that recently presented by Klotz et al following an Arzt and Gohring model. An apparent stress exponent, n ap , of 7.8 and an apparent activation energy, Q ap , 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 " n model", considers that this interaction merely raises the stress exponent associated to the non reinforced matrix by a value of n . Consequently, the apparent activation energy value is simultaneously raised. The n model predicts accurately the experimental data and presents advantages for analysing the creep behaviour of the dispersion strengthened materials.

revista de metalurgia

Análisis del comportamiento en fluencia de un material intermetálico de base Ni&lt;sub&gt;3&lt;/sub&gt;Al reforzado por dispersión de óxidos, mediante el modelo &lt;i&gt;ñ&lt;/i&gt; de interacción dislocación dispersoide