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首页> 外文期刊>Journal of Materials Research >Interfacial plasticity governs strain delocalization in metallic nanoglasses
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Interfacial plasticity governs strain delocalization in metallic nanoglasses

机译:界面塑性治理金属纳米液体中的应变临床化

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摘要

Intrinsic size effects in nanoglass plasticity have been connected to the structural length scales imposed by the interfacial network, and control over this behavior is critical to designing amorphous alloys with improved mechanical response. In this paper, atomistic simulations are employed to probe strain delocalization in nanoglasses with explicit correlation to the interfacial characteristics and length scales of the amorphous grain structure. We show that strength is independent of grain size under certain conditions, but scales with the excess free volume and degree of short-range ordering in the interfaces. Structural homogenization upon annealing of the nanoglasses increases their strength toward the value of the bulk metallic glass; however, continued partitioning of strain to the interfacial regions inhibits the formation of a primary shear band. Intrinsic size effects in nanoglass plasticity thus originate from biased plastic strain accumulation within the interfacial regions, which will ultimately govern strain delocalization and homogenous flow in nanoglasses.
机译:纳米玻璃塑性中的固有尺寸效应已经连接到由界面网络施加的结构长度,并且对这种行为的控制对于设计具有改进的机械反应的非晶合金至关重要。在本文中,采用原子模拟在纳米粒子中探测纳米型中的临床分层化,与无定形晶粒结构的界面特征和长度尺度显式相关性。我们表明,在某些条件下,强度与粒度无关,但在接口中具有过多的自由体积和短距离排序程度。在退火时的结构均匀化增加它们对散装金属玻璃的价值的强度;然而,继续划分对界面区域的应变抑制初级剪切带的形成。因此,纳米玻璃塑性中的固有尺寸效应来自界面区域内的偏置塑性应变积累,最终将在纳米柱中定治应变临床化和均匀流动。

著录项

  • 来源
    《Journal of Materials Research》 |2019年第13期|2325-2336|共12页
  • 作者

    Cheng Bin; Trelewicz Jason R.;

  • 作者单位

    SUNY Stony Brook Dept Mat Sci & Chem Engn Stony Brook NY 11794 USA;

    SUNY Stony Brook Dept Mat Sci & Chem Engn Stony Brook NY 11794 USA|SUNY Stony Brook Inst Adv Computat Sci Stony Brook NY 11794 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    amorphous; nanostructure; simulation;

    机译:非晶;纳米结构;模拟;

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