Correlation between the minimum grain size obtainable by ball milling and lattice strain

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:752

Article

Mohamed, Farghalli A.¹ 

[1] Univ Calif Irvine, Dept Mat Sci & Engn, Irvine, CA 92697 USA

关键词: Ball milling;    Dislocation density;    Energy;    Lattice strain;    Minimum grain size;    Stress;   

DOI  :  10.1016/j.msea.2019.02.049

来源: Elsevier

【 摘 要 】

Primary among the top-down processing techniques that can be used to synthesize nanocrystalline materials is ball milling. During milling, the gain size decreases with milling time, reaching a minimum grain size, d(min). Minimum grain size attainable is a characteristic of each material. Ball milling introduces considerable amount of lattice strain, epsilon. Such a strain increases rapidly with time, reaching a maximum value that coincides with d(min). By applying a recently developed dislocation model, which relates, d(min), to several physical parameters (such as the stacking fault energy and hardness), and by adopting several fundamental concepts, which are related to deformation behavior in materials, it is shown that d(min)/b depends on (1/epsilon)(0.94), wherebis the Burgers vectorThe validity of this functional dependence is examined by analyzing experimental data on several nanocrystalline materials.

【 授权许可】

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