scholarly journals Kinetics of Ordering in Cu3Au : An Atomistic Approach

1992 ◽  
Vol 291 ◽  
Author(s):  
Zhigang Xi ◽  
Bulbul Chakraborty
Keyword(s):  
Monte Carlo ◽  
Growth Kinetics ◽  
Structure Factor ◽  
Effective Medium Theory ◽  
Realistic Model ◽  
Medium Theory ◽  
Anisotropic Scaling ◽  
Model Hamiltonian ◽  
Universal Feature ◽  
Kinetics Of

ABSTRACTWe study the kinetics of ordering in Cu3Au using a model Hamiltonian derived from the effective medium theory of chemical bonding. Monte Carlo simulations are used to investigate universal and non-universal features of the growth kinetics. Anisotropic scaling of the structure factor is observed in late-stage growth of ordered domains. The anisotropy is a non-universal feature determined by the details of the microscopic model, and we find that the anisotropy observed in the simulations is in excellent agreement with experiments on Cu3Au. The simulations are discussed in the context of theories of unstable growth. To our knowledge, this is the first study of kinetics in a realistic model Hamiltonian describing the material-specific properties of Cu3Au.

Growth Kinetics of Molecular Beam Epitaxy on Non-Singular Surfaces

1992 ◽  
Vol 280 ◽  
Author(s):  
J. F. Egler ◽  
N. Otsuka ◽  
K. Mahalingam
Keyword(s):  
Surface Roughness ◽  
Monte Carlo ◽  
Growth Kinetics ◽  
Molecular Beam ◽  
Singular Surface ◽  
Sticking Coefficient ◽  
Singular Surfaces ◽  
Vicinal Surfaces ◽  
Kinetics Of ◽  
Multiple Configurations

ABSTRACTGrowth kinetics on non-singular surfaces were studied by Monte Carlo simulations. In contrast to the growth on singular and vicinal surfaces, the sticking coefficient on the non-singular surfaces was found to decrease with increase of the surface roughness. Simulations of annealing processes showed that surface diffusion of atoms leads to a stationary surface roughness, which is explained by multiple configurations having the lowest energy in the non-singular surface.

Athermal Martensites, Temperature-Time-Transformation Diagrams and Thermal Hysteresis: Monte Carlo Simulations of Strain Pseudospins

2012 ◽  
Vol 185 ◽  
pp. 31-33 ◽  
Author(s):  
N Shankaraiah ◽  
K.P.N. Murthy ◽  
Turab Lookman ◽  
S.R. Shenoy
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Domain Walls ◽  
Thermal Hysteresis ◽  
Temperature Cycling ◽  
Hysteretic Behavior ◽  
Model Hamiltonian ◽  
Long Range Interactions ◽  
Transformation Diagrams ◽  
Kinetics Of

We explore the kinetics of a three-state strain pseudospin model for a square/rectangle ferroelastic transition, described by a temperature dependent hamiltonian without quenched disorder, using temperature quench Monte Carlo simulations. The model hamiltonian includes power law anisotropic long range interactions, which lock the domain walls in a symmetry breaking diagonal direction. In athermal parameter regime, there are fast conversions at the athermal transition temperature, but with delay tails above it, as in experiment. The conversion delay tails have a Vogel-Fulcher divergence at transition to austenite. The incubation delays and their insensitivity to elastic energy scales are attributed to entropy barriers. Temperature cycling shows hysteretic behavior in physical quantities.

An on-lattice agent-based Monte Carlo model simulating the growth kinetics of multicellular tumor spheroids

2020 ◽  
Vol 77 ◽  
pp. 194-203
Author(s):  
S. Ruiz-Arrebola ◽  
A.M. Tornero-López ◽  
D. Guirado ◽  
M. Villalobos ◽  
A.M. Lallena
Keyword(s):  
Monte Carlo ◽  
Growth Kinetics ◽  
Monte Carlo Model ◽  
Multicellular Tumor Spheroids ◽  
Tumor Spheroids ◽  
Agent Based ◽  
Kinetics Of

The Ordered Phase Formation in Ti-Al-Ga Alloys

1970 ◽  
Vol 28 ◽  
pp. 440-441
Author(s):  
Shiro Fujishiro ◽  
Harold L. Gegel
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Titanium Alloys ◽  
Growth Kinetics ◽  
Stoichiometric Composition ◽  
Good Potential ◽  
Alpha Titanium ◽  
Cold Rolled ◽  
Kinetics Of ◽  
Thermal Stability Of

Ordered-alpha titanium alloys having a DO19 type structure have good potential for high temperature (600°C) applications, due to the thermal stability of the ordered phase and the inherent resistance to recrystallization of these alloys. Five different Ti-Al-Ga alloys consisting of equal atomic percents of aluminum and gallium solute additions up to the stoichiometric composition, Ti3(Al, Ga), were used to study the growth kinetics of the ordered phase and the nature of its interface.The alloys were homogenized in the beta region in a vacuum of about 5×10-7 torr, furnace cooled; reheated in air to 50°C below the alpha transus for hot working. The alloys were subsequently acid cleaned, annealed in vacuo, and cold rolled to about. 050 inch prior to additional homogenization

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