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Phase-Field Simulation of Grain Boundary Evolution In Microstructures Containing Second-Phase Particles with

T F Flint¹, Y L Sun², Q Xiong²

¹Dalton Nuclear Institute, The University of Manchester, Manchester, M13 9PL, UK. Thomas.Flint@manchester.ac.uk.

Scientific Reports

|December 6, 2019

Summary

This study models grain growth in Ti6Al4V alloys, showing how particles with lower thermal conductivity significantly alter coarsening behavior. Thermal shielding and gradient forces around particles are key factors influencing microstructural evolution.

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Area of Science:

Metallurgy and Materials Science
Computational Materials Science

Background:

Meso-scale thermal field interactions are vital for predicting microstructural evolution in thermomechanical processing.
Crystal grain growth is a fundamental metallurgical phenomenon influenced by thermodynamic forces at grain boundaries.
Second-phase particles impede grain boundary movement, altering coarsening behavior, especially when possessing different thermal properties.

Purpose of the Study:

To predict grain growth in a Ti6Al4V alloy with second-phase particles using a multi-phase field model.
To investigate the influence of thermal gradients and particle thermal properties on grain coarsening.
To couple a multi-phase field framework with the heat equation for accurate thermal-mechanical simulations.

Main Methods:

Utilized a multi-phase field model incorporating thermal gradient and curvature driving forces.
Fully coupled the multi-phase field framework with the heat equation.
Simulated grain growth in a Ti6Al4V alloy system with oxide and carbide precipitate inclusions.

Main Results:

The model successfully predicted grain boundary behavior around pinning particles under thermal gradients.
Particles with lower thermal conductivity significantly influenced grain coarsening dynamics.
Observed effects include thermal shielding and the generation of thermal gradient driving forces.

Conclusions:

The thermal gradient driving force is crucial for predicting detailed grain boundary behavior around particles.
Second-phase particle thermal conductivity is a critical parameter affecting alloy microstructural evolution.
This modeling approach provides insights into thermomechanical processing of metallic alloys.