Thermodynamic and Kinetic Modelling Hydrogenation of Titanium Particles and Sheets

2011 ◽  
Vol 264-265 ◽  
pp. 1764-1769
Author(s):  
Wei Qi Li ◽  
Jin Zhou ◽  
Wei Min Gao
Keyword(s):  
Phase Transformation ◽  
Diffusion Process ◽  
Hydrogen Diffusion ◽  
Kinetic Modelling ◽  
Alloying Element ◽  
Manufacturing Costs ◽  
Ti Alloys ◽  
Simulation Based ◽  
Fundamental Understanding ◽  
Insight Into

Use of hydrogen as a temporary alloying element in Ti alloys is an attractive approach to improve the mechanical properties of the materials, enhance processability and thereby reduce manufacturing costs. In this paper, the hydrogen diffusion process and the phase transformation both between Ti particles and in Ti sheets were simulated to analyze the mechanism of hydrogen diffusion in different phases (α-Ti, β-Ti and TiHx). With the simulation based on the kinetics and thermodynamics, quantitative behaviors of the hydrogen diffusion and the phase transformation were analyzed. The simulation results provide an insight into the diffusion process and improve the fundamental understanding of the mechanism of diffusion and phase transformation.

scholarly journals Influence of β-Stabilizers on the α-Ti→ω-Ti Transformation in Ti-Based Alloys

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1135
Author(s):  
Askar Kilmametov ◽  
Alena Gornakova ◽  
Mikhail Karpov ◽  
Natalia Afonikova ◽  
Anna Korneva ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Room Temperature ◽  
Volume Fraction ◽  
High Pressure Torsion ◽  
Bulk Diffusion ◽  
Eutectoid Decomposition ◽  
Next Generation ◽  
Alloying Element ◽  
Ti Alloys ◽  
Ω Phase

The development of next generation Ti-based alloys demand completely new processes and approaches. In particular, the Ti-alloys of next generation will contain not only α-Ti and β-Ti phases, but also small amounts of ω-phase and intermetallic compounds. The β→ω phase transformation induced by high-pressure torsion (HPT) has been studied in detail recently. In this work, we investigated the HPT-induced α→ω phase transformation. For this purpose, we added various β-stabilizers into α-Ti matrix of studied Ti-alloys. Ti-alloys with 4% Fe, 2% Cr, 3% Ni, and 4% Co (wt. %) have been annealed at the temperatures below their point of eutectoid decomposition, from β-Ti to α-Ti, and respective intermetallics (TiFe, Ti2Co, Ti2Ni, TiCr2). Volume fraction of HPT-driven ω-phase (from ≤5 up to ~80%) depended on the amount of alloying element dissolved in the α-matrix. Evaluation of lattice parameters revealed accelerated mass transfer during HPT at room temperature corresponding to bulk diffusion in α-Ti at ~600 °С.

Exploring vowel formant estimation through simulation-based techniques

2020 ◽  
Vol 6 (s1) ◽  
Author(s):  
Tyler Kendall ◽  
Charlotte Vaughn
Keyword(s):  
Predictive Coding ◽  
Linear Predictive Coding ◽  
Fine Grained ◽  
Vowel Formant ◽  
Simulation Based ◽  
Insight Into

AbstractThis paper contributes insight into the sources of variability in vowel formant estimation, a major analytic activity in sociophonetics, by reviewing the outcomes of two simulations that manipulated the settings used for linear predictive coding (LPC)-based vowel formant estimation. Simulation 1 explores the range of frequency differences obtained when minor adjustments are made to LPC settings, and measurement timepoints around the settings used by trained analysts, in order to determine the range of variability that should be expected in sociophonetic vowel studies. Simulation 2 examines the variability that emerges when LPC settings are varied combinatorially around constant default settings, rather than settings set by trained analysts. The impacts of different LPC settings are discussed as a way of demonstrating the inherent properties of LPC-based formant estimation. This work suggests that differences more fine-grained than about 10 Hz in F1 and 15–20 Hz in F2 are within the range of LPC-based formant estimation variability.

scholarly journals Hydrogen diffusion process in the oxides formed on zirconium alloys during corrosion in pressurized water reactor conditions

2017 ◽  
Vol 116 ◽  
pp. 1-13 ◽  
Author(s):  
Marc Tupin ◽  
Frantz Martin ◽  
Caroline Bisor ◽  
Romain Verlet ◽  
Philippe Bossis ◽  
...  
Keyword(s):  
Diffusion Process ◽  
Hydrogen Diffusion ◽  
Zirconium Alloys ◽  
Pressurized Water Reactor ◽  
Pressurized Water ◽  
Water Reactor

Insight into microstructural and phase transformations in electrochemical sodiation–desodiation of a bismuth particulate anode

2017 ◽  
Vol 5 (40) ◽  
pp. 21536-21541 ◽  
Author(s):  
Chek-Hai Lim ◽  
Baskar Selvaraj ◽  
Yen-Fang Song ◽  
Chun-Chieh Wang ◽  
Jian-Ting Jin ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Phase Transformations ◽  
X Ray ◽  
In Operando ◽  
Delayed Phase ◽  
Insight Into

In operando synchrotron X-ray analyses reveal unique delayed phase transformation and particle fracturing processes of a Bi anode for Na-ion batteries.

Preparation of gamma-PVDF with controlled orientation and insight into phase transformation

Polymer ◽  
2017 ◽  
Vol 123 ◽  
pp. 282-289 ◽  
Author(s):  
Haijun Wang ◽  
Xi Yang ◽  
Yanqun Zhao ◽  
Chao Yan ◽  
Shuaiyi Wang ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Insight Into

Molecular interactions shaping the tetraspanin web

2017 ◽  
Vol 45 (3) ◽  
pp. 741-750 ◽  
Author(s):  
Sjoerd J. van Deventer ◽  
Vera-Marie E. Dunlock ◽  
Annemiek B. van Spriel
Keyword(s):  
Molecular Interactions ◽  
Intracellular Signaling ◽  
Spatial Organization ◽  
Complex Mixture ◽  
Point Of View ◽  
Intramolecular Interactions ◽  
Fundamental Understanding ◽  
High Degree ◽  
Partner Proteins ◽  
Insight Into

To facilitate the myriad of different (signaling) processes that take place at the plasma membrane, cells depend on a high degree of membrane protein organization. Important mediators of this organization are tetraspanin proteins. Tetraspanins interact laterally among themselves and with partner proteins to control the spatial organization of membrane proteins in large networks called the tetraspanin web. The molecular interactions underlying the formation of the tetraspanin web were hitherto mainly described based on their resistance to different detergents, a classification which does not necessarily correlate with functionality in the living cell. To look at these interactions from a more physiological point of view, this review discusses tetraspanin interactions based on their function in the tetraspanin web: (1) intramolecular interactions supporting tetraspanin structure, (2) tetraspanin–tetraspanin interactions supporting web formation, (3) tetraspanin–partner interactions adding functional partners to the web and (4) cytosolic tetraspanin interactions regulating intracellular signaling. The recent publication of the first full-length tetraspanin crystal structure sheds new light on both the intra- and intermolecular tetraspanin interactions that shape the tetraspanin web. Furthermore, recent molecular dynamic modeling studies indicate that the binding strength between tetraspanins and between tetraspanins and their partners is the complex sum of both promiscuous and specific interactions. A deeper insight into this complex mixture of interactions is essential to our fundamental understanding of the tetraspanin web and its dynamics which constitute a basic building block of the cell surface.

Improved insight into catalytic reactions by kinetic modelling and LIF detection of intermediate radical species

1989 ◽  
pp. 424-425
Author(s):  
E. Fridell ◽  
B. Hellsing ◽  
S. Ljungström ◽  
T. Wahnström ◽  
A. Rosé ◽  
...  
Keyword(s):  
Kinetic Modelling ◽  
Catalytic Reactions ◽  
Radical Species ◽  
Intermediate Radical ◽  
Insight Into

scholarly journals Modeling and Experimental Validation of the VARTM Process for Thin-Walled Preforms

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2003
Author(s):  
Da Wu ◽  
Ragnar Larsson ◽  
Mohammad S. Rouhi
Keyword(s):  
Shell Model ◽  
Computational Efficiency ◽  
Large Scale ◽  
Strongly Coupled ◽  
Thin Walled Structures ◽  
Simulation Based ◽  
Thin Walled ◽  
High Computational Efficiency ◽  
Insight Into ◽  
Vartm Process

In this paper, recent shell model is advanced towards the calibration and validation of the Vacuum-assisted Resin Transfer Molding (VARTM) process in a novel way. The model solves the nonlinear and strongly coupled resin flow and preform deformation when the 3-D flow and stress problem is simplified to a corresponding 2-D problem. In this way, the computational efficiency is enhanced dramatically, which allows for simulations of the VARTM process of large scale thin-walled structures. The main novelty is that the assumptions of the neglected through-thickness flow and the restricted preform deformation along the normal of preform surface suffice well for the thin-walled VARTM process. The model shows excellent agreement with the VARTM process experiment. With good accuracy and high computational efficiency, the shell model provides an insight into the simulation-based optimization of the VARTM process. It can be applied to either determine locations of the gate and vents or optimize process parameters to reduce the deformation.

Phase transformation in dilute U-TI alloys

1984 ◽  
Vol 14 (4) ◽  
pp. 378
Author(s):  
G. Kimmel ◽  
A. Landau ◽  
J. Sariel ◽  
U. Admon
Keyword(s):  
Phase Transformation ◽  
Ti Alloys
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