Accession Number : AD0763480
Title : Low Temperature Solubility of Hydrogen in Niobium.
Descriptive Note : Technical rept.,
Corporate Author : ILLINOIS UNIV URBANA DEPT OF METALLURGY AND MINING ENGINEERING
Personal Author(s) : Holmquist,Gary R. ; Birnbaum,Howard K.
Report Date : JUL 1973
Pagination or Media Count : 31
Abstract : The precipitation of hydrogen from solid solution to form a hydride was studied in the Nb-H and Nb-D systems at temperatures between 77K and 300K. A large amount of undercooling was observed during cooling; the extent of which decreased after thermally cycling. On heating a large thermal hysteresis was observed before resolution of the hydrides occurred. These results were interpreted in terms of a precipitation model which requires a large amount of plastic accommodation to occur during precipitation. The effects of N additions and cold working were studied and shown to be consistent with this model. (Author)
Descriptors : (*NIOBIUM, *HYDROGEN EMBRITTLEMENT), (*HYDROGEN, *SOLUBILITY), CHEMICAL PRECIPITATION, HYDRIDES, PHASE DIAGRAMS, ELECTRICAL RESISTANCE, LOW TEMPERATURE, DIFFUSION
Subject Categories : Metallurgy and Metallography
Distribution Statement : APPROVED FOR PUBLIC RELEASE