Diffusion in Nanocrystalline Metals and Alloys—A Status Report
Diffusion in Nanocrystalline Metals and Alloys—A Status Report
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DOI：
10.1002/adem.200310079
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发表时间：
2003-05
影响因子：
3.6
通讯作者：
R. Würschum;S. Herth;U. Brossmann
中科院分区：
文献类型：
--
作者：
R. Würschum;S. Herth;U. Brossmann
扩散是决定纳米晶材料在许多应用中的适用性的关键性质，并且对于评估纳米晶样品中的界面与常规晶界的不同程度至关重要。本文概述了纳米晶金属和合金中的扩散。重点放在影响纳米晶材料中扩散的界面特性上，如结构弛豫、晶粒生长、孔隙率和特定类型的界面。此外，还讨论了晶间非晶相和晶间熔化对扩散的影响，并简要总结了GB结构和扩散的原子模拟。在现有扩散数据的基础上，讨论了扩散介导的变形和感生磁各向异性过程。
Diffusion is a key property determining the suitability of nanocrystalline materials for use in numerous applications, and it is crucial to the assessment of the extent to which the interfaces in nanocrystalline samples differ from conventional grain boundaries. The present article offers an overview of diffusion in nanocrystalline metals and alloys. Emphasis is placed on the interfacial characteristics that affect diffusion in nanocrystalline materials, such as structural relaxation, grain growth, porosity, and the specific type of interface. In addition, the influence of intergranular amorphous phases and intergranular melting on diffusion is addressed, and the atomistic simulation of GB structures and diffusion is briefly summarized. On the basis of the available diffusion data, the diffusion‐mediated processes of deformation and induced magnetic anisotropy are discussed.