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Correlation between the atomic configurations and the amorphous- to-icosahedral phase transition in metallic glasses

机译：金属玻璃中原子构型与非晶-二十面体相变之间的相关性

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摘要

Positron annihilation spectroscopy and differential scanning calorimetry were used to evaluate the changes of the atomic configurations in Zr-based metallic glasses (MGs) due to alloying and plastic deformation. The correlation between the atomic configurations of MGs and the amorphous-to-icosahedral phase transition due to heating was investigated. The results indicate that the free volume frozen in the as-cast Zr60Al15Ni25, Zr65Al7.5Ni10Cu17.5, and Zr65Al7.5Ni10Cu17.5Ag5 MGs substantially decreases in sequence. More excess free volume is introduced in Zr65Al7.5Ni10Cu17.5Ag5 MG due to cold rolling and milling. The annihilation of free volume due to alloying considerably stabilizes the icosahedral structure of MGs, which enhances the nucleation and growth of quasicrystals upon heating. However, the nucleation and growth of quasicrystals are considerably suppressed in Zr65Al7.5Ni10Cu17.5Ag5 MG due to cold rolling and milling, during which the more introduced excess free volume results in substantial destruction of short-range order with 5-fold symmetry. The present work further provides direct evidence for the prevalence of icosahedral short-range order in MGs.
机译：正电子an没光谱和差示扫描量热法用于评估Zr基金属玻璃（MGs）的合金化和塑性变形引起的原子构型变化。研究了MGs的原子构型与由于加热导致的非晶-二十面体相变之间的相关性。结果表明，在铸态Zr60Al15Ni25，Zr65Al7.5Ni10Cu17.5和Zr65Al7.5Ni10Cu17.5Ag5 MG中冻结的自由体积依次减少。由于冷轧和铣削，Zr65Al7.5Ni10Cu17.5Ag5 MG中引入了更多的多余体积。由于合金化而造成的自由体积的ni灭极大地稳定了MG的二十面体结构，从而在加热时增强了准晶体的形核和生长。但是，由于冷轧和铣削，Zr65Al7.5Ni10Cu17.5Ag5 MG中的准晶体的形核和生长得到了显着抑制，在此期间，更多引入的过量自由体积导致具有5倍对称性的短程有序破坏显着。本工作进一步为MGs中二十面体短程秩序的流行提供了直接证据。

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  • 来源
    《Journal of Materials Research》 |2018年第18期|2775-2783|共9页
  • 作者

    Geng Guihong; Yan Zhijie; Hu Yong; Wang Zhi; Ketov Sergey V.; Eckert Juergen;

  • 作者单位

    North Minzu Univ, Sch Mat Sci & Engn, Yinchuan 750021, Peoples R China;

    North Minzu Univ, Sch Mat Sci & Engn, Yinchuan 750021, Peoples R China;

    Taiyuan Univ Sci & Technol, Sch Mat Sci & Engn, Taiyuan 030024, Shanxi, Peoples R China;

    South China Univ Technol, Sch Mech & Automot Engn, Guangzhou 510640, Guangdong, Peoples R China;

    Austrian Acad Sci, Erich Schmid Inst Mat Sci, A-8700 Leoben, Austria;

    Austrian Acad Sci, Erich Schmid Inst Mat Sci, A-8700 Leoben, Austria;

  • 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; phase transformation; quasicrystal;

    机译：非晶相变准晶体;

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