Effect of boundary heat flux on columnar formation in binary alloys: A phase-field study

Author:

Du Lifei1,Zhang Peng1,Yang Shaomei1,Chen Jie1,Du Huiling1

Affiliation:

1. College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

Abstract

A non-isothermal phase-field model was employed to simulate the columnar formation during rapid solidification in binary Ni–Cu alloy. Heat flux at different boundaries was applied to investigate the temperature gradient effect on the morphology, concentration and temperature distributions during directional solidifications. With the heat flux input/extraction from boundaries, coupling with latent heat release and initial temperature gradient, temperature distributions are significantly changed, leading to solute diffusion changes during the phase-transition. Thus, irregular columnar structures are formed during the directional solidification, and the concentration distribution in solid columnar arms could also be changed due to the different growing speeds and temperature distributions at the solid–liquid interfaces. Therefore, applying specific heat conditions at the solidifying boundaries could be an efficient way to control the microstructure during solidifications.

Funder

National Natural Science Foundation of China

Cultivating Research Program of Xi’an University of Science and Technology

Key Innovation Team of Shaanxi Province

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

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