Two-dimensional discrete dislocation models of deformation in polycrystalline thin metal films on substrates

Alexander Hartmaier; Markus J. Buehler; Huajian Gao

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Two-dimensional discrete dislocation models of deformation in polycrystalline thin metal films on substrates

机译：基板上多晶金属薄膜的二维离散位错变形模型

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The time-dependent irreversible deformation of polycrystalline thin metal films on substrates is investigated using two-dimensional discrete dislocation dynamics models incorporating essential parameters determined from atomistic studies. The work is focused on the mechanical properties of uncapped films, where diffusive processes play an important role. The simulations incorporate dislocation climb along the grain boundary as well as conservative glide. Despite of severe limitations of the two-dimensional dislocation models, the simulation results are found to largely corroborate experimental findings on different dominant deformation mechanisms at different film thicknesses.

机译：使用二维离散位错动力学模型研究了衬底上多晶金属薄膜随时间的不可逆变形，该模型包含了从原子研究确定的基本参数。这项工作的重点是未覆盖膜的机械性能，其中扩散过程起着重要作用。模拟包括沿晶界的位错爬升以及保守的滑行。尽管二维位错模型存在严重局限性，但仿真结果在很大程度上证实了在不同膜厚下不同主变形机制的实验结果。

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《Materials Science and Engineering. A, Structural Materials》 |2005年第7期|p.260-263|共4页
作者
Alexander Hartmaier; Markus J. Buehler; Huajian Gao;
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作者单位

Max Planck Institute for Metals Research, Heisenbergstr. 3, 70569 Stuttgart, Germany;

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原文格式 PDF
正文语种 eng
中图分类工程材料学;
关键词
thin films; polycrystals; plasticity; dislocation dynamics; diffusion;

机译：薄膜;多晶体;可塑性;位错动力学;扩散;

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2. A Discrete Dislocation Plasticity Model of Creep in Polycrystalline Thin Films [J] . A. Hartmaier, M. J. Buehler, H. Gao Diffusion and Defect Data. Solid State Data, Part A. Defect and Diffusion Forum . 2004,第0期

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3. A Quasi Two-Dimensional Conduction Model for Polycrystalline Silicon Thin-Film Transistor Based on Discrete Grains [J] . Wong M., Chow T., Wong C. C., IEEE Transactions on Electron Devices . 2008,第8期

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4. STRENGTH AND DEFORMATION OF A THIN POLYCRYSTALLINE FILM ON A SUBSTRATE: DISLOCATION DENSITY ANALYSIS [C] . Leon Mishnaevsky, Dietmar Gross European Conference of Fracture . 2004

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5. A finite difference method for studying thermal deformation in two-dimensional micro scale metal thin films exposed to ultrashort pulsed lasers. [D] . Wang, Haojie. 2007

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7. Size effects in polycrystalline thin films analyzed by discrete dislocation plasticity [O] . Nicola L, Van der Giessen E, Needleman A 2005

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8. Thin Films of Silicon on Metallurgical Silicon Substrates-Phase II. Topical Report No. 3. Stability of Thin Film Polycrystalline Silicon Solar Cells [R] . Chu, T. L. 1978

机译：冶金硅衬底上的硅薄膜 - 阶段II。专题报告第3号。薄膜多晶硅太阳能电池的稳定性

Two-dimensional discrete dislocation models of deformation in polycrystalline thin metal films on substrates

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