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Improving the plasticity of bulk metallic glasses via pre-compression below the yield stress

机译：通过屈服应力以下的预压缩来提高大块金属玻璃的可塑性

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摘要

The poor plasticity of bulk metallic glasses (BMGs) has severely limited their potential structural applications. In this paper, we reported that uniaxial pre-compression below the yield stress can be used to significantly improve the plasticity of BMGs. An as-cast Cu_(36)Zr_(48)Al_8Ag_8 BMG was pre-compressed under various pressures (400, 800 and 1600 MPa) and durations (30, 60 and 120 min). The pre-compression processes led to structural change that increases the free volume and produces nanocrystals in the BMG matrix, which subsequently improved the plasticity of the BMG. Detailed data analysis showed that increasing the applied pressure speeds up the structural relaxation process and nanocrystallization occurs only at high enough pressure. This investigation indicated that appropriate selection of the pressure and duration of a pre-compression process is critical for the improved plasticity of BMGs.
机译：大块金属玻璃（BMG）的可塑性差，严重限制了其潜在的结构应用。在本文中，我们报道了低于屈服应力的单轴预压缩可用于显着提高BMG的可塑性。铸态Cu_（36）Zr_（48）Al_8Ag_8 BMG在各种压力（400、800和1600 MPa）和持续时间（30、60和120分钟）下进行预压缩。预压缩过程导致结构变化，从而增加了自由体积并在BMG基质中产生了纳米晶体，从而提高了BMG的可塑性。详细的数据分析表明，增加施加的压力会加快结构弛豫过程，并且只有在足够高的压力下才会发生纳米晶化。该研究表明，适当选择预压缩过程的压力和持续时间对于提高BMG的可塑性至关重要。

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  • 来源
    《Materials Science and Engineering》 |2014年第25期|68-76|共9页
  • 作者

    Ji Gu; Min Song; Song Ni; Xiaozhou Liao; Shengfeng Guo;

  • 作者单位

    State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;

    State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;

    State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;

    School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia;

    Faculty of Materials and Energy, Southwest University, Chongqing 400715, China;

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

    Bulk metallic glasses; Pre-compression; Plasticity; Free volume; Nanocrystallite;

    机译：大块金属玻璃;预压缩可塑性;自由体积;纳米微晶;

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