Grain size effects on slip band development

IF 3.8 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures Pub Date : 2025-08-08 DOI:10.1016/j.ijsolstr.2025.113589

Rembert D. White , Behnam Ahmadikia , Irene J. Beyerlein

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引用次数: 0

Abstract

Crystallographic slip localizations, called slip bands, concentrate stress in polycrystals, often leading to the nucleation of damage. Slip band development has been experimentally shown to be sensitive to grain size, tending to develop more frequently and with a greater intensity in large grains. In this work, we investigate the influence of grain size on the propensity for crystallographic slip band development. To this end, we employ the slip band-fast Fourier transform method (SB-FFT). SB-FFT is a 3D, full-field crystal plasticity model that permits the incremental development of discrete crystallographic slip bands according to microstructure and material properties. We present a model Inconel 718 tricrystal to isolate the effect of grain size. Our findings show that slip bands in large grains develop at lower applied strain levels and at a faster rate than slip bands in small grains. The grain size effect is due to a backstress produced primarily by the interaction of the slip band and its neighboring grain. The backstress is most intense at small grain sizes, impeding slip activity within a developing slip band and immediately surrounding the slip band.

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晶粒尺寸对滑移带发展的影响

晶体滑移局部化，称为滑移带，在多晶中集中应力，常常导致损伤成核。实验表明，滑移带的发展对晶粒尺寸很敏感，在大晶粒中，滑移带的发展更频繁，强度更大。在这项工作中，我们研究了晶粒尺寸对晶体滑移带发展倾向的影响。为此，我们采用了滑移带快速傅里叶变换方法（SB-FFT）。SB-FFT是一种三维、全场晶体塑性模型，允许根据微观结构和材料性能逐步发展离散晶体滑移带。我们提出了一个模型Inconel 718三晶，以隔离晶粒尺寸的影响。我们的研究结果表明，大晶粒中的滑移带比小晶粒中的滑移带在较低的施加应变水平下以更快的速度发展。晶粒尺寸效应主要是由滑移带及其邻近晶粒相互作用产生的背应力引起的。在小晶粒尺寸处，背应力最为强烈，这阻碍了正在发育的滑移带内的滑移活动，并直接包围了滑移带。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Solids and Structures 物理-力学

CiteScore

6.70

自引率

8.30%

发文量

405

审稿时长

70 days

期刊介绍： The International Journal of Solids and Structures has as its objective the publication and dissemination of original research in Mechanics of Solids and Structures as a field of Applied Science and Engineering. It fosters thus the exchange of ideas among workers in different parts of the world and also among workers who emphasize different aspects of the foundations and applications of the field. Standing as it does at the cross-roads of Materials Science, Life Sciences, Mathematics, Physics and Engineering Design, the Mechanics of Solids and Structures is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from the more classical problems of structural analysis to mechanics of solids continually interacting with other media and including fracture, flow, wave propagation, heat transfer, thermal effects in solids, optimum design methods, model analysis, structural topology and numerical techniques. Interest extends to both inorganic and organic solids and structures.