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首页> 外文期刊>Materials Science and Engineering >Electron localization governed plasticity in nanotwinned metals beyond the Hall-Petch type limit
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Electron localization governed plasticity in nanotwinned metals beyond the Hall-Petch type limit

机译：电子定位在大厅 - Petch类型限制之外的纳米线金属中的可塑性

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摘要

While nanotwinned metals have been widely reported to show a strengthening-softening transition as the twin spacing decreases below a critical size, which is similar to the Hall-Petch limit in nanocrystalline materials, a recent study has suggested that some nanotwinned high entropy alloys (HEAs) could show continuous strengthening as long as the twin spacing decreases. Here we investigate the physical origin of the contrasting plasticity in nanotwinned face-centered-cubic (FCC) metals beyond the Hall-Petch type limit by using atomistic simulations based on density functional theory. Our results indicate that the degree of electron localization among atoms at the FCC sites and the stacking faults, which have a hexagonal-closed-packed (HCP) structure, governs the plasticity in nanotwinned metals with extremely fine twin spacing. Specifically, metals whose electrons are more localized at FCC atoms than those at stacking faults, such as conventional FCC metals, are associated with positive stacking fault energy and accordingly detwinning and strengthening-to-softening transition beyond the Hall-Petch type limit. In contrast, metals in which electrons are more localized at stacking faults than at FCC sites as found in some HEAs exhibit negative stacking fault energy and continuous strengthening by the unconventional FCC-to-HCP martensite transformation when the Hall-Petch type limit is reached. This work provides a new microscopic aspect from the electron properties to understand the macroscopic mechanical behavior of nanotwinned FCC metals which can shed some light on designing novel complex alloys.
机译：虽然已被广泛报道纳米丝金属以显示出强化 - 软化转变，但随着临界尺寸的临界尺寸减小，其与纳米晶体材料中的霍尔 - Petch限制类似，最近的研究表明一些纳米型高熵合金（HEAS ）只要双间距降低，就可以显示连续加强。在这里，我们通过使用基于密度泛函理论的原子模拟来研究纳米翅片中心中心立方（FCC）金属中的对比度可塑性的物理来源。我们的结果表明，FCC位点的原子中的电子定位程度和具有六边形封闭式填充（HCP）结构的堆叠故障，管辖纳米丝金属的可塑性，具有极佳的双链间距。具体地，电子在FCC原子上更为局部地定位的金属，例如常规FCC金属，例如传统的FCC金属，与阳性堆叠故障能量相关联，并因此在霍尔竖起型极限范围内弯曲和强化到软化转变。相反，金属在堆叠故障时比在一些HEAS中发现的FCC位点在堆叠故障中更为局部地局部，当达到霍尔竖起型限制时，通过非传统的FCC-o-HCP马氏体转换表现出负堆叠故障能量和连续强化。这项工作提供了来自电子特性的新的微观方面，以了解纳米丝的FCC金属的宏观力学行为，其能够在设计新的复合物合金上揭示一些光。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140251.1-140251.9|共9页
  • 作者

    Jianwei Xiao; Nan Wu; Olanrewaju Ojo; Chuang Deng;

  • 作者单位

    Department of Mechanical Engineering University of Manitoba Winnipeg MB R3T 5V6 Canada;

    Department of Mechanical Engineering University of Manitoba Winnipeg MB R3T 5V6 Canada;

    Department of Mechanical Engineering University of Manitoba Winnipeg MB R3T 5V6 Canada;

    Department of Mechanical Engineering University of Manitoba Winnipeg MB R3T 5V6 Canada;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Nanotwin; Plasticity; Stacking fault energy; Electron density;

    机译：nanotwin;可塑性;堆叠故障能量;电子密度;

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