Hydrogen embrittlement of niobium. I. Macroscopic behavior at low temperatures. Technical report

Technical Report · Fri Aug 01 04:00:00 EDT 1975

OSTI ID:7340787

Gahr, S; Grossbeck, M L; Birnbaum, H K

The effect of hydrogen on the ductility of niobium was studied in the temperature range 77 to 300/sup 0/K. Tension testing and detailed fractographic studies were used to establish the roles of hydrogen concentration, temperature, yield stress and strain rate in the fracture process. It was shown that two ductility minima can be observed in the temperature range examined and that these are related to the precipitation of hydrides during the deformation process. The fracture mode is cleavage in the temperature range of both ductility minima. The solid solution of H in Nb was shown to be a highly ductile alloy; the ductility being terminated by the formation of a stress induced hydride which exhibits cleavage. (GRA)

• Research Organization: Illinois Univ., Urbana (USA). Dept. of Metallurgy and Mining Engineering
• OSTI ID: 7340787
• Report Number(s): AD-A-017035
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360105* -- Metals & Alloys-- Corrosion & Erosion
CRYOGENIC FLUIDS
DUCTILITY
ELEMENTS
EMBRITTLEMENT
FAILURES
FLUIDS
FRACTURES
HYDROGEN
LOW TEMPERATURE
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
METALLURGICAL EFFECTS
METALS
NIOBIUM
NONMETALS
REFRACTORY METALS
STRESSES
TENSILE PROPERTIES
TRANSITION ELEMENTS