Phase Field Modeling of Microstructure Evolution During Solidification and Subsequent Solid-State Phase Transformation of Au-Pt Alloys

doi:10.11900/0412.1961.2024.00255

Acta Metall Sin

2025, Vol. 61

Issue (1): 109-116 DOI: 10.11900/0412.1961.2024.00255

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Phase Field Modeling of Microstructure Evolution During Solidification and Subsequent Solid-State Phase Transformation of Au-Pt Alloys

YU Dong¹, MA Weilong², WANG Yali¹, WANG Jincheng¹(

)

1 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
2 College of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

Cite this article:

YU Dong, MA Weilong, WANG Yali, WANG Jincheng. Phase Field Modeling of Microstructure Evolution During Solidification and Subsequent Solid-State Phase Transformation of Au-Pt Alloys. Acta Metall Sin, 2025, 61(1): 109-116.

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Abstract

The evolution of the microstructure during solidification and solid-state phase transformation is crucial for controlling the material microstructure and optimizing performance. Achieving an integrated numerical simulation of the microstructural evolution from solidification to solid-state phase transformation is a cutting-edge challenge in material-microstructure simulation. This study focuses on Au-Pt alloys, utilizing a multiphase field model combined with a microstructural information transfer algorithm to simulate and predict microstructural evolution during the solidification and solid-state phase transformation under different initial composition conditions. The study successfully realizes an integrated simulation prediction of the microstructural evolution across both processes, revealing the influence of microsegregation and grain boundaries during solidification on subsequent processes of decomposition and spinodal decomposition.

Key words: solidification solid-state phase transformation microstructure evolution phase field method integrated modeling

Received: 14 August 2024

ZTFLH:

TG111.4

Fund: National Key Research and Development Program of China(2021YFC2202301)

Corresponding Authors: WANG Jincheng, professor, Tel: (029)88460650, E-mail: jchwang@nwpu.edu.cn

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	YU Dong
	MA Weilong
	WANG Yali
	WANG Jincheng

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https://www.ams.org.cn/EN/10.11900/0412.1961.2024.00255 OR https://www.ams.org.cn/EN/Y2025/V61/I1/109

Fig.1 Schematics of interpolation between different scales (dx and dy are grid sizes for a large spatial scale used for modeling of solidification microstructure evolution, while $d ˜ x$ and $d ˜ y$ are grid sizes for a small spatial scale used for modeling of solid phase transformation; N is the number of fine grids in a certain dimension)
(a) coarse and fine grids at different scales (b) bilinear interpolation algorithm

Fig.2 Schematics of interpolation process of solute field
(a) simulated solidification microstructure with a domain of 15 μm × 15 μm and a coarse grid size (dx = dy = 10 nm; x_Pt—mole fraction of Pt)
(b) microstructure extracted from Fig.2a with a small domain (1 μm × 1 μm) and a coarse grid size (dx = dy = 10 nm)
(c) microstructure interpolated from Fig.2b with a much finer grid size (

d ˜ x

d ˜ y

= 1 nm)

Fig.3 Phase diagram of Au-Pt alloy (T—temperature)

Table1 Physical property parameters of Au-Pt alloy and related modeling parameters

Fig.4 Evolutions of the concentration field during solification at t = 2 × 10³Δt (a1, a2), 1 × 10⁴Δt (b1, b2), and 5 × 10⁴Δt (c1, c2); and the orientation fields at the late stage (d1, d2) of Au-Pt alloys with different initial compositions (Each color in Figs.4d1 and d2 represents grains with the same orientation; t—time, Δt—time step)
(a1-d1) x_Pt = 0.3 (a2-d2) x_Pt = 0.6

Fig.5 Microstructure evolutions during subsequnet solid-state phase transformation at t = 0 (a1, a2), 1.2 × 10³Δt (b1, b2), 8 × 10³Δt (c1, c2), and 4 × 10⁴Δt (d1, d2) when x_Pt = 0.3 with different initial microstructures as shown in the rectangle areas in Fig.4c1
(a1-d1) domain in grains (a2-d2) domain near grain boundaries

Fig.6 Microstructure evolutions during subsequnet solid state phase transformation at t = 0 (a1, a2), 1.2 × 10³Δt (b1, b2), 8 × 10³Δt (c1, c2), and 4 × 10⁴Δt (d1, d2) when x_Pt = 0.6 with different initial microstructures as shown in the rectangle areas in Fig.4c2
(a1-d1) domain in grains (a2-d2) domain near grain boundaries

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