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首页> 美国政府科技报告 >Effects of Hydrostatic Pressure on the Changes in Elastic Constants Caused by Hydrogen in Vanadium and Nb sub 53 Ta sub 47
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Effects of Hydrostatic Pressure on the Changes in Elastic Constants Caused by Hydrogen in Vanadium and Nb sub 53 Ta sub 47

机译：静水压对钒和铌亚53 Ta 47中氢致弹性常数变化的影响

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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. (ERA citation 05:012181)

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