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强磁场定向凝固金属材料界面稳定性研究进展
Research status on interfacial stability of metal materials directionally solidified in high magnetic field
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- DOI:
- 作者:
- 袁言鼎
YUAN Yanding
- 作者单位:
- 东北大学 材料电磁过程研究教育部重点实验室
Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University
- 关键词:
- 定向凝固;强磁场; 固-液界面稳定性; 金属
directional solidification; strong magnetic field; solid-liquid interface stability; metal
- 摘要:
- 强磁场定向凝固技术是一种新型的凝固手段,对材料的加工与改性有着得天独厚的优势。本文主要涉及金属材料在强磁场定向凝固过程中固-液界面稳定性的问题,总结了当前这一方向的研究进展。洛伦兹力、热电磁对流以及磁化力能够影响熔体流动,改变界面处的溶质分布,引起成分过冷,从而影响界面稳定性。固相处的热电磁力以及磁偶极子相互作用则可通过改变界面能来影响界面稳定性。重点介绍了磁场对界面前沿溶质梯度和界面能的影响,概括了洛伦兹力、磁化力和磁偶极子相互作用等磁场机制。指出了目前主要存在的两个问题:实验定量化和多种效应耦合化,并对未来研究提出了展望。
High magnetic field directional solidification technology is a new solidification method, which has unique advantages in the processing and modification of materials. This paper mainly deals with the stability of solid-liquid interface during directional solidification of metal materials in high magnetic field, and summarizes the current research status in this direction. The effects of magnetic field on the solute gradient and interface energy at the interface front are emphatically introduced, and the magnetic field mechanisms such as Lorentz force, magnetization force and magnetic dipole interaction are summarized. Lorentz force, thermo-electromagnetic convection and magnetization force can affect the melt flow, change the solute distribution at the interface, and cause constitutional supercooling, thus affecting the interface stability. The interfacial stability can be affected by changing the interfacial energy by the thermoelectric magnetic force and magnetic dipole interaction. At present, two main problems are pointed out: quantitative experiment and coupling of multiple effects, and the prospect of future research is put forward.