EFFECT OF HYDROGEN ON DISLOCATION LOCKING IN NIOBIUM

Journal Article · Fri Apr 01 04:00:00 EST 1960 · J. Less-Common Metals

DOI:https://doi.org/10.1016/0022-5088(60)90022-9· OSTI ID:4134885

Wilcox, B A; Huggins, R A

The strain-aging tendencies of as-received commercial purity arc-melted niobium and hydrogenated niobium from the same heat were investigated using yield point return and dynamic modulus measurements to study the aging process. Comparison of activation energies for strain aging with those for interstitial diffusion revealed that hydrogen could be responsible for dislocation locking in niobium. In order to obtain a measure of the degree of dislocation locking as a function of hydrogen content. the lower yield stress of electron-beam melted niobium (both as-received and hydrogen-charged) was measured as a function of grain diameter, using a constant strain rate and test temperature. In the equation sigma /sub y/ = sigma /sub 1/ + k d/sup -1/2/, t he parameter sigma / sub 1/ was found to be relatively insensitive to hydrogen content. and the parameter k/sub y/, a measure of the locking strength. was found to increase with increasing hydrogen content. (auth)

• Research Organization: Wright-Patterson Air Force Base, Ohio
• NSA Number: NSA-14-025986
• OSTI ID: 4134885
• Journal Information: J. Less-Common Metals, Journal Name: J. Less-Common Metals Vol. Vol: 2
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AGING
DEFECTS
DEFORMATION
DIFFUSION
ELECTRON BEAMS
EQUATIONS
GRAIN SIZE
HYDROGEN
INTERSTITIAL ATOMS
LATTICES
MELTING
METALS, CERAMICS, AND OTHER MATERIALS
NIOBIUM
STRESSES
TEMPERATURE
TENSILE PROPERTIES