Tilting Dynamics and Parameter Dependence of the Dendrite Array Under a Transverse Magnetic Field: A Unified Magnetic Field-Based Phase-Field Study

被引：0

作者：

Zhang, Congjiang ^{[1
]}

Yu, Hongbin ^{[1
]}

Ren, Weili ^{[1
]}

Yuan, Xiaotan ^{[1
]}

Ding, Biao ^{[1
]}

Zheng, Tianxiang ^{[1
]}

Lei, Zuosheng ^{[1
]}

Zhong, Yunbo ^{[1
]}

Zhang, Ang ^{[2
]}

机构：

[1] Shanghai Univ, Coll Mat Sci & Engn, State Key Lab Adv Special Steel, Shanghai 200444, Peoples R China

[2] Chongqing Univ, Coll Mat Sci & Engn, Natl Engn Res Ctr Magnesium Alloys, Nat Key Lab Adv Casting Technol, Chongqing 400044, Peoples R China

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2024年 / 55卷 / 02期

基金：

中国国家自然科学基金;

关键词：

DIRECTIONAL SOLIDIFICATION; MELT FLOW; GROWTH; CONVECTION; MACROSEGREGATION; ALLOYS; MAGNETOHYDRODYNAMICS; MICROSTRUCTURE; SIMULATIONS; GRAINS;

D O I：

10.1007/s11661-023-07261-z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Convection-driven solute transport has an important effect on the evolution of dendrites during solidification. A unified magnetic field-phase field-lattice Boltzmann model is developed to investigate dendrite growth under a transverse magnetic field (TMF). The accuracy of the numerical model is validated by thermoelectric current calculation and experimental dendritic morphology. Results show that the TMF application changes the dendrite morphology from symmetry to tilt, and makes the flat solidification front become steep. The dendrite tilt is due to the different solute distributions on both sides of the tip. The solute distribution difference is caused by the existence of ring-like flow driven by thermoelectric magnetic convection (TEMC) around the dendrite tip. With the increase of magnetic field intensity, the tilt angle of the dendrite array varies nonmonotonically. As a comparison, with the increase of temperature gradient, the tilt angle increases monotonically. The variation difference of the tilt angle is the result of the competition between TEMC and magnetic damping convection, which are induced by Lorentz forces from different sources.

引用

页码：500 / 512

页数：13