Surface Stress Effects on the Elastic Behavior of Nanoporous Metals

2005 ◽  
Vol 900 ◽  
Author(s):  
Douglas A. Crowson ◽  
Diana Farkas ◽  
Sean G. Corcoran
Keyword(s):  
Computer Simulations ◽  
Surface Stress ◽  
Field Model ◽  
Phase Field Model ◽  
Atomic Scale ◽  
Elastic Behavior ◽  
Stress Effects ◽  
Macroscopic Deformation ◽  
Nanoporous Metals ◽  
Nanoporous Structures

ABSTRACTAtomic scale computer simulations were used to investigate the surface stress induced deformation in nanoporous metals. A phase field model was used to generate digital nanoporous structures that are quantitatively similar to those created experimentally via dealloying. We analyze the important effects of surface relaxations on the macroscopic deformation in these samples as well as in small spherical clusters.

Stress- and diffusion-induced interface motion: Modelling and numerical simulations

2007 ◽  
Vol 18 (6) ◽  
pp. 631-657 ◽  
Author(s):  
HARALD GARCKE ◽  
ROBERT NÜRNBERG ◽  
VANESSA STYLES
Keyword(s):  
Grain Boundary ◽  
Numerical Simulations ◽  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Boundary Motion ◽  
Interface Motion ◽  
Stress Effects ◽  
Grain Boundary Motion ◽  
And Diffusion

We propose a phase field model for stress and diffusion-induced interface motion. This model, in particular, can be used to describe diffusion-induced grain boundary motion and generalizes a model of Cahn, Fife and Penrose as it more accurately incorporates stress effects. In this paper we will demonstrate that the model can also be used to describe other stress-driven interface motion. As an example, interface motion resulting from interactions of interfaces with dislocations is studied.

Atomic-Scale Computer Simulation of Mixture Precipitation Mechanism for Ni75AlxV25-x Alloy

2005 ◽  
Vol 475-479 ◽  
pp. 3115-3118 ◽  
Author(s):  
Yu Hong Zhao ◽  
Dong Ying Ju ◽  
Hua Hou
Keyword(s):  
Computer Simulation ◽  
Spinodal Decomposition ◽  
Field Model ◽  
Phase Field Model ◽  
Nucleation And Growth ◽  
Atomic Scale ◽  
Precipitation Mechanism ◽  
Ordered Phases ◽  
Nucleation And Growth Mechanism ◽  
Microscopic Phase Field Model

With the microscopic phase-field model, the early precipitation mechanisms of the ternary Ni75AlxV25-x alloys with middle Al composition were explored by computer simulation in this paper. Through the simulated atomic pictures and composition order parameters of precipitates, we can explain the complex precipitation mechanisms of θ (Ni3V) and γ′ (Ni3Al) ordered phases. Simulated results also show that the precipitation characteristic of γ′ phase transforms from non-classical nucleation and growth to congruent ordering + Spinodal decomposition gradually, otherwise, the precipitation characteristic of θ phase transforms from congruent ordering + Spinodal decomposition to non-classical nucleation and growth mechanism gradually.

MARMOT Phase-Field Model for the U-Si System

2016 ◽  
Author(s):  
Larry Kenneth Aagesen ◽  
Daniel Schwen
Keyword(s):  
Phase Field ◽  
Field Model ◽  
Phase Field Model

scholarly journals Phase-field modeling of grain evolutions in additive manufacturing from nucleation, growth, to coarsening

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Min Yang ◽  
Lu Wang ◽  
Wentao Yan
Keyword(s):  
Additive Manufacturing ◽  
Phase Field ◽  
Field Model ◽  
Three Dimensional ◽  
Phase Field Model ◽  
Nucleation Theory ◽  
Experimental Result ◽  
Classical Nucleation Theory ◽  
Validation Experiment ◽  
Powder Particles

AbstractA three-dimensional phase-field model is developed to simulate grain evolutions during powder-bed-fusion (PBF) additive manufacturing, while the physically-informed temperature profile is implemented from a thermal-fluid flow model. The phase-field model incorporates a nucleation model based on classical nucleation theory, as well as the initial grain structures of powder particles and substrate. The grain evolutions during the three-layer three-track PBF process are comprehensively reproduced, including grain nucleation and growth in molten pools, epitaxial growth from powder particles, substrate and previous tracks, grain re-melting and re-growth in overlapping zones, and grain coarsening in heat-affected zones. A validation experiment has been carried out, showing that the simulation results are consistent with the experimental results in the molten pool and grain morphologies. Furthermore, the grain refinement by adding nanoparticles is preliminarily reproduced and compared against the experimental result in literature.

Coupling phase-field model and CFD for hot cracking predictions of Al-Li alloys

2021 ◽  
Vol 192 ◽  
pp. 110361
Author(s):  
Dongxu Chen ◽  
Junsheng Wang ◽  
Chi Zhang
Keyword(s):  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Hot Cracking ◽  
Coupling Phase
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