RESEARCH DESIGN TO EVALUATE Zr-2.5Nb AND Zr-2.5Nb-0.5Cu ALLOYS FOR DELAYED FAILURE HYDROGEN EMBRITTLEMENT. Final Report, October 15, 1962-October 14, 1963

YIELD PHENOMENA AND FRACTURE OF HYDRIDED ZIRCONIUM. Quarterly Report, October 1-December 31, 1964

“…Finally, certain zirconium alloys have exhibited a high susceptibility to static, delayed failure due to the presence of absorbed hydrogen. (6)(7)(8)(9) Most of the data in the literature on mechanical properties of hydrided zirconium are empirical in nature. Such data can be of con- (11,12) suggested that a Cottrell pinning mechanism might be responsible (13) since, according to a prediction by Fisher, the product of absolute temperature and yield point remained constant at all temperatures (except -195°C).…”