Effects of hydrostatic pressure on the changes in elastic constants caused by hydrogen in vanadium and Nb/sub 53/Ta/sub 47/

Conference · Mon Jan 01 04:00:00 EST 1979

OSTI ID:5677832

Fisher, E S; Alberts, H L; Katahara, K

Hydrogen dissolved in V, Nb or Ta or their solid solutions causes the C' shear modulus to decrease, whereas C/sub 44/ increases. These appear to be entirely different effects, with ..delta..C' being a result of interstitial relaxation and ..delta..C/sub 44/ arising from the electronic contribution. The apparent inverse dependence of ..delta..C', i.e., relaxation strength, on atomic volume of the alloys implies that the positive hydrostatic pressure derivative of C' should decrease with addition of H. This prediction has been tested with duplicate measurements at ANL and at HIG on two different vanadium samples with measurements of C', C/sub 44/ and K (bulk modulus) to 3kb. The results show dC'/dP decreasing significantly by 8% and 6.5%, respectively at HIG and ANL, with no significant changes in dC/sub 44//dP or dK/dP. A second experiment on the alloy Nb/sub 53/Ta/sub 47/ showed dC'/dP decreasing by 10% with addition of 4.4 at. % H, with no changes in dC/sub 44//dP or dK/dP.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5677832
• Report Number(s): CONF-7909109-1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CRYOGENIC FLUIDS
ELASTICITY
ELEMENTS
FLUIDS
HYDROGEN
MECHANICAL PROPERTIES
NIOBIUM ALLOYS
NONMETALS
PRESSURE DEPENDENCE
STORAGE
TANTALUM ALLOYS
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
VANADIUM ALLOYS