Based on microstructural evidence, the joggedscrew model would appear to be particularly appropriate todescribe the creep deformation of both #gamma#-TiAl and#alpha#-Ti alloys, which are the majority constituent phases intwo important classes of titanium alloys. The jogged-screwmodel in its conventional form is unable to reproduce the stressdependence for the minimum creep rates observed in thesematerials. The creep rates also appear to be too large using theconventional model. A modification of the model is proposedwhich incorporates a stress-dependent jog height. It isdemonstrated that this modified model may provide animproved description of creep in these materials based on themagnitude and stress dependence of the minimum creep rates.
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