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Micro- and mesomechanical aspects of deformation-induced surface roughening in polycrystalline titanium

机译：多晶钛中变形引起的表面粗糙化的微观和细观力学方面

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摘要

This article addresses the problem of multiscale surface roughening in commercial purity titanium subjected to uniaxial tension. In situ investigations of the evolution of grain- and mesoscale roughness in selected regions of titanium specimens were performed. Based on the experimental data obtained, 3D polycrystalline models with explicit consideration of grain structure were generated and implemented in finite-element calculations. Constitutive models of grains were constructed, using crystal plasticity theory to take into account the elastic-plastic anisotropy on the grain scale. The experimental and numerical results obtained have shown that a series of multiscale surface undulations are formed on the free surface of the specimen subjected to tension. The smallest out-of-plane surface displacements are attributed to intragrain dislocation glide. Larger displacements are associated with relative grain motion. The latter give rise to the formation of an orange peel pattern. The displacements of the two types are a microscale phenomenon. The largest surface displacements formed by the grain groups involved in out-of-plane and in-plane cooperative motion are referred to as the mesoscale roughness. The latter is found to correlate well with local strains of the specimen regions under examination. The main conclusion drawn from the experimental and numerical results is that it is the mesoscale that will furnish a clue to prediction of plastic strain localization and fracture of materials far in advance of the macroscale manifestation of these processes.
机译：本文解决了承受单轴张力的工业纯钛中多尺度表面粗糙化的问题。在钛标本的选定区域中，对晶粒度和中尺度粗糙度的演变进行了原位研究。根据获得的实验数据，生成了明确考虑晶粒结构的3D多晶模型，并将其用于有限元计算。利用晶体可塑性理论，建立了晶粒本构模型，并考虑了晶粒尺度上的弹塑性各向异性。获得的实验和数值结果表明，在受到拉力的试样的自由表面上形成了一系列多尺度的表面起伏。最小的平面外表面位移归因于晶粒内位错滑移。较大的位移与相对的谷物运动有关。后者引起桔皮图案的形成。两种类型的位移都是微观现象。由参与平面外和平面内合作运动的晶粒群形成的最大表面位移称为中尺度粗糙度。发现后者与所检查的样本区域的局部应变良好相关。从实验和数值结果得出的主要结论是，中尺度将为这些过程的宏观表现之前的塑性应变局部化和材料断裂的预测提供线索。

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  • 来源
    《Materials Science and Engineering》 |2017年第14期|248-258|共11页
  • 作者

    V. Romanova; R. Balokhonov; A. Panin; M. Kazachenok; A. Kozelskaya;

  • 作者单位

    Institute of Strength Physics and Materials Science of the Russian Academy of Sciences, pr. Academicheskii 2/4, 634055 Tomsk, Russia;

    Institute of Strength Physics and Materials Science of the Russian Academy of Sciences, pr. Academicheskii 2/4, 634055 Tomsk, Russia;

    Institute of Strength Physics and Materials Science of the Russian Academy of Sciences, pr. Academicheskii 2/4, 634055 Tomsk, Russia,National Research Tomsk Polytechnic University, pr. Lenina 30, 634050 Tomsk, Russia;

    Institute of Strength Physics and Materials Science of the Russian Academy of Sciences, pr. Academicheskii 2/4, 634055 Tomsk, Russia;

    Institute of Strength Physics and Materials Science of the Russian Academy of Sciences, pr. Academicheskii 2/4, 634055 Tomsk, Russia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Titanium alloys; Deformation-induced surface roughening; Micromechanics; Finite-element method; Crystal plasticity; Mesoscale;

    机译：钛合金;变形引起的表面粗糙;微力学;有限元法晶体可塑性;中尺度;

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