Effect of hydrogen on the temperature dependence of the elastic constants of vanadium single crystals

Journal Article · Fri Feb 01 04:00:00 EST 1980 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.327729· OSTI ID:5563375

Ko, C R; Salama, K; Roberts, J M

The changes in the absolute values of the elastic constants C', C/sub L/ and C/sub 44/ by the ultrasonic technique over the temperature range 144--320 K with varying amounts of hydrogen in Vanadium up to 1.5 at.% have been determined. In the ..cap alpha.. phase, the changes in the absolute values of C' and C/sub L/ were found to be linear with negative slopes of 2.0% and 0.5%/at.% H, respectively. The changes in C/sub 44/ in the ..cap alpha.. phase varied between 0 and 0.5 or 0.9% H. The bulk modulus and Voight-Reuss average Young's modulus in that phase were found to decrease 0.70% and 0.65%/at.% H, respectively. The elastic constants in the temperature range of the ..cap alpha.. phase exhibited no change in their temperature dependences by the addition of hydrogen. The present results are compared to the results of other published investigations. The anharmonic effects are discussed in the light of the volume expansion due to H in V upon the elastic constants, the possible electronic effect by suggesting the addition of H to V is analogously similar electronically to adding Cr to V and finally the Snoek relaxation effect. It is concluded that the Snoek relaxation best describes the ..delta..C' effect observed when hydrogen is present in the ..cap alpha.. phase. This effect yields an asymmetric distortion energy parameter (3(A-B)/(A+2B)) of the order of 0.47.

• Research Organization: Department of Mechanical Engineering, University of Houston, Houston, Texas 77004
• OSTI ID: 5563375
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 51:2; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
COMPARATIVE EVALUATIONS
CRYOGENIC FLUIDS
CRYSTALS
DATA
ELASTICITY
ELEMENTS
EQUATIONS
FLUIDS
HYDROGEN
INFORMATION
LOW TEMPERATURE
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
METALS
MONOCRYSTALS
NONMETALS
QUANTITY RATIO
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TRANSITION ELEMENTS
VANADIUM