Phase field simulation on microstructure evolution in solidification and aging process of squeeze cast magnesium alloy

Pan, Haowei; Han, Guomin; Han, Zhuo Rachel; Liu, B C

doi:10.1088/1757-899x/84/1/012065

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…However, for the case of complex grain structures in polycrystalline solids that may undergo grain growth, we use the phase-field method to represent the microstructure. Specifically, the phase-field model of grain growth [51][52][53][54][55] is utilized to distinguish between grains and grain boundaries, and to track the microstructure evolution during grain growth. In that model, phasefield variables 𝜂 5 are assigned such that their values indicate the type of region (e.g., gains, or GBs).…”

Section: Calculating the Effective Thermal Conductivity Of Polycrysta...mentioning

confidence: 99%

A new model for the effective thermal conductivity of polycrystalline solids

Badry

Ahmed

2020

AIP Advances

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We introduce a novel model for the effective thermal conductivity of polycrystalline solids based on the thin-interface description of grain boundaries (GBs). In contrast to existing models, our new model treats a GB as an autonomous "phase" with its own thermal conductivity. The Kapitza resistance/conductance of a thin interface is then derived in terms of the interface thermal conductivity and width. In turn, the effective thermal conductivity of polycrystals is derived in terms of grain size, grain and GB conductivities, and GB width. This treatment allows the model to simulate the change of Kapitza resistance/conductance with segregation/doping, GB structure/phase transition, or GB decohesion. Moreover, since the model assumes a finite width for GBs, it is expected to give better predictions than its sharp-interface-based counterparts for nanoscale grains. The predictions of the new model deviate from the corresponding ones from existing models by 1-100% as the grain size approaches the GB width. High-fidelity finite-element simulations were conducted to validate the predictions of the new model. These simulations proved the higher accuracy of the new model. We also discuss how to generalize this treatment to other types of interfaces in heterogeneous materials. The advantages and limitations of the new model are summarized, and some future directions are highlighted.

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Section: Calculating the Effective Thermal Conductivity Of Polycrysta...mentioning

confidence: 99%

A new model for the effective thermal conductivity of polycrystalline solids

Badry

Ahmed

2020

AIP Advances

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“…It is worth noting that the dendrite shapes are not sensitive to the variation of the Al concentration in Mg-Al alloys. Pressure [45,46] is another factor that also influences the dendrite shape. When a 100 MPa pressure is applied during the squeeze casting of a Mg-9wt-%Al alloy, the primary arms of the dendrite are slimmer than those that form under the atmospheric pressure.…”

Section: Equiaxed Growth Of Dendrite Cross-sectionsmentioning

confidence: 99%

“…When a 100 MPa pressure is applied during the squeeze casting of a Mg-9wt-%Al alloy, the primary arms of the dendrite are slimmer than those that form under the atmospheric pressure. Furthermore, the 100 MPa pressure results in a higher dendritic growth rate [46].…”

Section: Equiaxed Growth Of Dendrite Cross-sectionsmentioning

confidence: 99%

Phase field simulation of microstructures of Mg and Al alloys

Hong

Nie

2017

Materials Science and Technology

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The phase field method has recently emerged as a powerful and versatile tool for mesoscale simulation of microstructure evolution in Mg and Al alloys. It permits the study of the evolution of arbitrary and complex microstructures without any presumption. This article provides a review of applications of the phase-field method in Mg and Al alloys. It covers the evolution of dendrites, the equilibrium shape of some key strengthening precipitates, the effect of pre-existing precipitates and dislocations on the distribution of precipitates, and strengthening effects caused by plate-shaped precipitates that are often encountered in Mg and Al alloys. To further improve the accuracy of the phase field simulation results and to further expand the phase field method to predict mechanical properties, the phase field method needs to be integrated with other methods to establish a multi-scale approach. This integration and its application on Mg and Al alloys are also reviewed. This paper is part of a thematic issue on Light Alloys.

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