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

Journal Article · Sat Sep 01 04:00:00 EDT 1979 · Ultrason. Symp. Proc.; (United States)

OSTI ID:5660325

Fisher, E S ^[1]; Alberts, H L; Katahara, K

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1. Argonne National Lab., IL

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.

• OSTI ID: 5660325
• Journal Information: Ultrason. Symp. Proc.; (United States), Journal Name: Ultrason. Symp. Proc.; (United States); ISSN ULSPD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
BINARY MIXTURES
DATA
DISPERSIONS
ELASTICITY
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN
INFORMATION
MECHANICAL PROPERTIES
METALS
MIXTURES
NIOBIUM
NONMETALS
NUMERICAL DATA
PRESSURE DEPENDENCE
REFRACTORY METALS
SHEAR PROPERTIES
SOLID SOLUTIONS
SOLUBILITY
SOLUTIONS
TANTALUM
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TRANSITION ELEMENTS
VANADIUM