纳米晶体材料热稳定性的研究进展

Research progress on thermal stabilization of nanocrystalline materials

摘要:

纳米晶体材料独特的结构特征使其具有不同于传统多晶材料的优异性能,如何提高纳米晶体材料的热稳定性,避免其过度粗化,是近年来材料领域研究的热点课题。本文综述了国内外对纳米晶体材料热稳定性的研究进展,简要介绍了纳米晶体材料的微观结构特点,着重分析了溶质原子、第二相颗粒和微观应力等因素对纳米晶体材料晶粒长大的影响规律,介绍了纳米晶体材料的热力学和动力学稳定机制。

Abstract:

The nanocrystalline materials exhibit the microstructure with an average grain size smaller than 100nm, which is responsible for their unique properties. A high thermal stability is the key for the application of nanocrystalline materials. Hence, the grain growth of nanocrystalline materials has been the focus of intense research efforts in recent years. This article reviews the current status of research in this field. The microstructural characteristics of nanocrystalline materials have been introduced. The effects of solute atom, the second particle and internal strain on the thermal stability of nanocrystalline materials are discussed. The basic theoretical models in thermodynamics stabilization and kinetics stabilization are summarized.