Effect of alloyed Ti on the microstructure and corrosion characteristics of a U-Ti alloy in a hydrogen environment

摘要

The influence of alloyed titanium element on the microstructure and the hydrogen corrosion properties of 500 degrees C/2 h aged U-0.79 wt.% Ti alloys was investigated. The results demonstrated that 500 degrees C/2 h aging treatment markedly decreased the hydriding corrosion resistance of U-Ti alloys. The microstructure and chemical compositions of U-0.79Ti alloys exerted a significant influence on the initial hydride nucleation sites and pitting corrosion behavior. A model was proposed to elucidate the formation mechanism of the preferential hydriding on the so-called "alpha-U2Ti" mixed phase area. (C) 2015 Elsevier Ltd. All rights reserved.