Steady state creep behavior of zirconia dispersion strengthened platinum alloys in medium stress regime

Microstructure and creep behavior of a commercial ZrO2 dispersion-strengthened Pt alloy were investigated. Emphasis was placed on examining the correlation between the minimum creep rates and the applied stress in the temperature range of 1273–1773 K. The ODS Pt alloy exhibited a highly elongated grain structure that had developed by a thermo-mechanical processing. The interfaces between ZrO2 particles and the Pt matrix were found to be incoherent. An attractive interaction appeared to be present between dislocations and ZrO2 particles. The detachment controlled dislocation creep model was used to explain the steady state creep behavior. The presence of ZrO2 inclusions was also beneficial for maintaining the grain structure and the subgrains, which then provides increased resistance to high temperature creep deformation.