The structures of niobium-hydride alloys

Wainwright, C; Cook, A.J.; Hopkins, B. E.

doi:10.1016/0022-5088(64)90134-1

Cited by 33 publications

(5 citation statements)

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“…The a-b solvus line was determined by using resistivity, [21][22][23] internal friction 24 and DTA 25 methods. Since niobium itself has a cubic body-centered crystal structure, the formation of b-phase is accompanied by about 11.9% molar volume increase, [26][27][28] leading to a deformation of the a)…”

Section: Introductionmentioning

confidence: 99%

Precipitation of hydrides in high purity niobium after different treatments

Barkov

Romanenko

Trenikhina

et al. 2013

Journal of Applied Physics

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Precipitation of lossy non-superconducting niobium hydrides represents a known problem for high purity niobium in superconducting applications. Using cryogenic optical and laser confocal scanning microscopy, we have directly observed surface precipitation and evolution of niobium hydrides in samples after different treatments used for superconducting RF cavities for particle acceleration. Precipitation is shown to occur throughout the sample volume, and the growth of hydrides is well described by the fast diffusion-controlled process in which almost all hydrogen is precipitated at T = 140 K within ∼30 min. 120 °C baking and mechanical deformation are found to affect hydride precipitation through their influence on the number of nucleation and trapping centers.

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Section: Introductionmentioning

confidence: 99%

Precipitation of hydrides in high purity niobium after different treatments

Barkov

Romanenko

Trenikhina

et al. 2013

Journal of Applied Physics

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“…The character of the interaction of niobium with hydrogen is approximately similar to that of the vanadium-hydrogen system [279]. Intensive absorption occurs in the range 250-360°C, after which it falls off appreciably (explained in [257] by decomposition of the low-temperature hydride form), and at 560-900°C, niobium again absorbs hydrogen intensely (due to the formation of a more stable hydride).…”

Section: Interaction With Hydrogenmentioning

confidence: 72%

Physical Metallurgy of Refractory Metals and Alloys

Savitskii¹,

Burkhanov²

1995

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All rights reservedNo part of this publication may be reproduced in any form without written permission from the publisher PREFACE TO THE AMERICAN EDITIONThe principal reasons which induced the authors to write this book and the features of the book are set forth in the preface to the Russian edition.That section of the science of metals which in Russian is called "metallovedenie" or the "physical chemistry of metals" is generally referred to in scientific and technical literature published in the English language by the term "physical metallurgy." These concepts are much broader than the term" metallography," used in the scientific and technical literature of various countries, and applied solely to research on the interrelationships of the structure and properties of metals and alloys.Each science must have its own subject and its own method of research. Certainly, all specialists will agree that metals and alloys, including their solid solutions, mechanical mixtures, and metallic compounds, form the subject of "physical metallurgy" or "physical chemistry of metals." The aim of this science. is to produce a theory and to elucidate the experimental relationships which ought finally to make it possible to calculate quantitatively alloys Of given properties for any working conditions and parameters.With regard to the methods of research on metals and alloys, we assume that "physical metallurgy" may properly employ any theoretical and experimental methods which will help to solve its basic problems. The experience of the last few decades has shown that among the experimental methods a leading position is occupied by the physicochemical analysis of metal systems developed by N. S. Kurnakov, that is to say, the systematic investigation of the phYSical properties of alloys as a function of he variation of their chemical composition and phase composition. This method has also been employed for investigating the interrelationship of the structure and properties of alloys at different temperatures and pressures (see E. M. Savitsky, The Influence of Temperature on the Mechanical Properties of Metals and Alloys, Stanford University Press, 1961). The "physical chemistry of metals" makes extensive use of physicochemical analysis. The science of metals and alloys absorbs all the achievements of the exact fundamental sciences, primarily physics and chemistry. It may even be said more precisely:The "physical chemistry of metals" or "physical metallurgy" is the synthesis of the physics of metals and the chemistry of metal alloys. The distribution and energy of electrons is the basic factor determining the crystal structure and all the properties of metals and alloys. The main problems which have to be solved in the framework of these sciences are the following: the electronic structure and nature of the interatomic bond in metal crystals, solid solutions of metals and metallic compounds, the development of methods for the quantitative measurement of the value of the interatomic forces with variation in the fundamental parameters...

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“…a and a 0 phases are disordered solutions of low hydrogen content (0-24 at.% H) and high hydrogen content (24-47 at.% H) respectively in bcc A2 Nb [16], and exhibit a miscibility gap [5,9,17,18] below the critical temperature. b phase is an ordered interstitial solid solution with fc orthorhombic structure [5,[17][18][19][20]. The composition range of b phase was proposed about 41-50 at.% H by Schober [15].…”

Section: Description Of the System And Experimental Informationmentioning

confidence: 99%