Influence of Thermal Treatment of Ti–45Nb Alloy in Ultrafine-Grained State on Its Structural Parameters and Heat Capacity

2022 ◽  
Author(s):  
E. V. Legostaeva ◽  
M. A. Khimich ◽  
Yu. P. Sharkeev ◽  
A. Yu. Eroshenko ◽  
O. A. Belyavskaya ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Thermal Treatment ◽  
Structural Parameters ◽  
Ultrafine Grained

Influence of thermal treatment of Ti-45Nb alloy in ultrafine-grained states on its structural parameters and heat capacity

2021 ◽  
pp. 84-91
Author(s):  
E.V. Legostaeva ◽  
◽  
M.A. Khimich ◽  
Yu.P. Sharkeev ◽  
A.Yu. Eroshenko ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Heat Capacity ◽  
Phase Transitions ◽  
Structural Parameters ◽  
Structural Phase ◽  
Coherent Scattering ◽  
Normal Stresses ◽  
Two Phase ◽  
Ω Phase ◽  
Ultrafine Grained

The effect of heat treatment of the Ti-45Nb alloy in the UFG state on its structural parameters (lattice parameters, volumetric phase ratio, sizes of coherent scattering regions, residual normal stresses) and their relationship with heat capacity have been studied. It has been established that the different character of the temperature dependence of the heat capacity for the Ti-45Nb alloy in the UFG and CC states is associated with the structural-phase features of the alloy in the UFG state: the two-phase structure of a-grains and b-grains, dispersion-hardened by the ω-phase, and phase transitions in the temperature range 400-600 °С.

Structural and Texture Studies of PbS Thin Film

2010 ◽  
Vol 442 ◽  
pp. 123-129 ◽  
Author(s):  
S.K. Mehmood ◽  
S. Zaman ◽  
K. Ahmed ◽  
M.M. Asim
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Properties ◽  
Thermal Treatment ◽  
Hydrazine Hydrate ◽  
Structural Parameters ◽  
Glass Substrates ◽  
Deposition Parameters ◽  
Cubic Structure ◽  
Post Deposition

In this study, we report on the structural parameters and texture development which occurred during deposition and annealing of PbS films and their effect on optical properties. The films under study were deposited on glass substrates through chemical bath method. The reactive substances used to obtain the PbS layers were lead accetae trihydrated, thiourea and hydrazine hydrate. The films were prepared with one molar bath concentration and for various deposition times. The data showed that as-prepared and annealed thin films are polycrystalline with cubic structure and predominantly textured along 100. Results showed that thinner films are more prone to post deposition heat treatments as compared to thicker ones. Deposition parameters and thermal treatment strongly influence the optical properties of PbS films.

The Analysis of SPD Paradox by Computer Modeling Technique

2009 ◽  
Vol 633-634 ◽  
pp. 231-248
Author(s):  
Igor V. Alexandrov ◽  
Roza G. Chembarisova
Keyword(s):  
Plastic Deformation ◽  
Thermal Treatment ◽  
Deformation Behavior ◽  
High Strength ◽  
High Ductility ◽  
Angular Pressing ◽  
Deformation Twins ◽  
Ultrafine Grained ◽  
Favorable Conditions ◽  
Dislocation Density Increase

The paper has viewed the manifestation of the paradox of severe plastic deformation (SPD), caused by the occurrence of preexisting deformation twins in ultrafine-grained Cu, which has been obtained by the combination of the SPD method, accomplished by an equal-channel angular pressing with the conventional methods of deformation-thermal treatment. The high strength of the obtained samples has proved to be conditioned by the occurrence of the high density of the coherent twin boundaries, serving as effective obstacles on the way of slipping dislocations. Moreover, the occurrence of the twins creates favorable conditions for the dislocation density increase both in the grains with the twins and in the grains without them. As a result the sample hardens, contributing additionally into its strength. Simultaneously it manifests high ductility. By doing so the deformation behavior of the sample is mainly conditioned by the grain boundaries of grains free from the twins. The results were obtained on the basis of the dislocation-based model which develops models of Y. Estrin and L. Tóth, M. Zehetbauer, and L. Remy.

The crystallite-size dependence of structural parameters in pure ultrafine-grained copper

1997 ◽  
Vol 30 (21) ◽  
pp. 3008-3015 ◽  
Author(s):  
K Zhang ◽  
I V Alexandrov ◽  
A R Kilmametov ◽  
R Z Valiev ◽  
K Lu
Keyword(s):  
Crystallite Size ◽  
Size Dependence ◽  
Structural Parameters ◽  
Ultrafine Grained

On the relationship of thermodynamic parameters with the buried surface area in protein-ligand complex formation

1996 ◽  
Vol 16 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Netai C. Singha ◽  
Namita Surolia ◽  
A. Surolia
Keyword(s):  
Heat Capacity ◽  
High Resolution ◽  
Complex Formation ◽  
Thermodynamic Parameters ◽  
Hydrophobic Interactions ◽  
Structural Parameters ◽  
Structural Data ◽  
Rational Drug Design ◽  
Poor Correlation ◽  
Ligand Complex

Prediction of thermodynamic parameters of protein-protein and antigen-antibody complex formation from high resolution structural parameters has recently received much attention, since an understanding of the contributions of different fundamental processes like hydrophobic interactions, hydrogen bonding, salt bridge formation, solvent reorganization etc. to the overall thermodynamic parameters and their relations with the structural parameters would lead to rational drug design. Using the results of the dissolution of hydrocarbons and other model compounds the changes in heat capacity (ΔCp), enthalpy (ΔH) and entropy (ΔS) have been empirically correlated with the polar and apolar surface areas buried during the process of protein folding/unfolding and protein-ligand complex formation. In this regard, the polar and apolar surfaces removed from the solvent in a protein-ligand complex have been calculated from the experimentally observed values of changes in heat capacity (ΔCp) and enthalpy (ΔH) for protein-ligand complexes for which accurate thermodynamic and high resolution structural data are available, and the results have been compared with the x-ray crystallographic observations. Analyses of the available results show poor correlation between the thermodynamic and structural parameters. Probable reasons for this discrepancy are mostly related with the reorganization of water accompanying the reaction which is indeed proven by the analyses of the energetics of the binding of the wheat germ agglutinin to oligosaccharides.

Heat capacity and upper critical field of Nb-Ti alloys after helium ion implantation and thermal treatment

1981 ◽  
Vol 17 (6) ◽  
pp. 3437-3439
Author(s):  
I. Goncharov ◽  
R. Herzog ◽  
N. Osipova ◽  
L. Petrova ◽  
P. Vassilev
Keyword(s):  
Heat Capacity ◽  
Thermal Treatment ◽  
Ion Implantation ◽  
Critical Field ◽  
Upper Critical Field ◽  
Ti Alloys ◽  
Helium Ion
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