The High Temperature Creep Behavior of Dispersion Strengthened Pt5Rh Composite

Abstract:

Adopting a large plastic deformation process, the dispersion strengthened Pt5Rh composite was prepared. The microstructure of the composite was analyzed by SEM, and the high temperature creep tests were carried out by a self-made high temperature creep test facility. The experiment results show that at high temperature and under low load the stress exponent of the dispersion strengthened Pt5Rh alloy does not change obviously with increasing of the temperature, and its apparent activation energy is much higher than those of pure platinum and Pt10Rh alloy. The high temperature creep properties of the dispersion strengthened Pt5Rh are better than those of conventional alloys. The creep mechanism of the dispersion strengthened Pt5Rh belongs to the proliferation creep mechanism; the creep fracture at high temperatures presents the brittle fracture