强磁场下第二相颗粒Ostwald熟化行为

Ostwald Ripening Behavior of Second-Phase Particles under High Magnetic Field

Ostwald熟化是粉末冶金、半固态加工、液相烧结、夹杂物控制等过程的核心问题,其本质是界面能的降低与溶质原子的长程扩散过程。Ostwald熟化过程受体积分数、合金元素、弹性应变、原始组织、外场等因素影响。近年来研究表明,外加强磁场对熟化过程影响显著,但作用机制还需深入研究。本文以磁场对熟化的影响方式为分类依据,具体分析了强磁场对相变、扩散、界面能的作用效果,并综述了强磁场下Ostwald熟化行为的研究进展。

The essence of Ostwald ripening is the reduction of interfacial energy and the long-range diffusion of solute atoms, which is the core problem of powder metallurgy, semi-solid processing, liquid phase sintering and inclusion control.The Ostwald ripening process is affected by many factors, such as volume fraction, alloy elements, elastic strain, original microstructure and external field, etc. In recent years, the application of high magnetic field has an important impact on the ripening process, but the mechanism needs to be further studied. In this paper, the effects of magnetic field on ripening are classified, the effects of phase transformation, diffusion and interface energy under high magnetic field are analyzed in detail, and the research progress of Ostwald ripening experiment under high magnetic field is also summarized.