Role of Hf and Zr in the hydrogen embrittlement of Ta and Nb alloys

Technical Report · Mon Jan 01 04:00:00 EST 1973

OSTI ID:4364262

Stephens, J R

The hydrogen embrittlement of aged T-111 and similar Ta and Nb alloys is characterized and the mechanisms believed responsible for the increased sensitivity of T-111 to low-temperature hydrogen embrittlement after aging for 1000 hours or longer near 1040 deg C are described. A total of eight Ta-base alloys and two Nb-base alloys were investigated. The effects of pre-age annealing temperature, aging time, temperature and environment, and alloy composition on the susceptibility to hydrogen embrittlement were investigated. The primary method of determining the effects of these variables on the ductility of T-111 was by bend testing at 25 and -- 196 deg C. Fractured specimens were examined by the scanning electron microscope, electron microprobe, metallography, and x-ray diffraction. (auth)

• Research Organization: National Aeronautics and Space Administration, Cleveland, Ohio (USA). Lewis Research Center
• NSA Number: NSA-29-018846
• OSTI ID: 4364262
• Report Number(s): N--73-29525; NASA-TM-X--68293
• Country of Publication: United States
• Language: English

Related Subjects

*NIOBIUM BASE ALLOYS-- EMBRITTLEMENT
*TANTALUM ALLOY-T111-- EMBRITTLEMENT
ABSORPTION
AGING
ANNEALING
BENDING
ELECTRON MICROSCOPY
FRACTURES
HAFNIUM ADDITIONS
HYDROGEN
LOW TEMPERATURE
MEDIUM TEMPERATURE
N50210* --Metals
Ceramics
& Other Materials--Metals & Alloys--Corrosion & Erosion & Surface Phenomena
TIME DEPENDENCE
VERY HIGH TEMPERATURE
ZIRCONIUM ADDITIONS