Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"BCC metals"”.
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First Principles-Based Interatomic Potentials for Modeling the Body-Centered Cubic Metals V, Nb, Ta, Mo, and W
… potentials for the body-centered cubic (bcc) metals V, Nb, Ta, Mo, and W from data generated by first-principles density-functional theory (DFT) calculations. Comparisons of a wide range of computed materials properties to DFT calculations and experimental data test the quality of the …
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Crystallographic, Morphological and Kinetic Studies of the Alpha-Beta Transformation in the Niobium-Hydrogen System
The group VB bcc metal-hydrogen systems have been extensively studied in the last few years. These studies are relevant to nuclear-reactor technology, superconductivity, and energy storage devices. The elements nitrogen and hydrogen form interstitial solid solutions with the group VB bcc metals and …
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Isotope effect for diffusion of tin in beta-titanium
… Ti has been measured at five temperatures in the bcc G-phase. Separation of the Sn isotopes was effected by 3-spectroscopy on electroplated sources. The effect is small and highly temperature-dependent, varying from 0.18 ± 0.03 at 9720 C to 0.37 ± 0.03 at 15250 C. When corrected for the mass …
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The effect of high pressure on self-diffusion in beta-titanium
… diffusion in the anomalous body-centered cubic metals. The magnitude of ~V appears to be too large to be consistent with the ""extrinsic"" vacancy mechanism of Kidson, but smaller than would normally be expected for simple vacancy diffusion in bcc metals; It is concluded that diffusion in …
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An ultrasonic study of trapped hydrogen in niobium
… at interstitial oxygen or nitrogen impurities in BCC metals. Such a model would 'be important for an understanding of the physical properties of such systems, particularly of the quantum diffusion effects which occur. A review of all the available data (specific heat, internal friction, neutron …
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Modeling of twinning as a deformation mechanism in iron (bcc) crystals and iron-based alloys
… expression for twin nucleation stress in bcc metals considering GPFE (generalized planar fault energy) and the dislocations bounding the twin nucleus. We minimize the total energy to predict the twinning stress relying only on parameters that are obtained through atomistic calculations, …
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Photoemission study of some novel materials: rare earth/transition metal interface, Ba06K04BiO3 and AlPdMn
… that the Eu(110) surface exhibits an fcc-bcc-like phase transition. The Eu(110) surface top layer is reconstructed to hexagonal-close-packed plane. This surface phase transition might be similar to the bulk martensitic phase transitions of bcc metals;Combining both photoemission and LEED …
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Development of cost effective materials for use as hydrogen purification membranes
… potential of the group-V body centered cubic (BCC) metals for use as hydrogen permeable membranes. V, Nb, and Ta all have significantly higher hydrogen permeability than Pd, but negligible ability to dissociate H2 into atomic hydrogen, and therefore require the application of a H2 dissociation …