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首页> 外文期刊>Journal of Materials Research >Plastic deformation and mechanical softening of Pd_(40)Cu_(30)Ni_(10)P_(20) bulk metallic glass during nanoindentation
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Plastic deformation and mechanical softening of Pd_(40)Cu_(30)Ni_(10)P_(20) bulk metallic glass during nanoindentation

机译:Pd_(40)Cu_(30)Ni_(10)P_(20)大块金属玻璃在纳米压痕过程中的塑性变形和机械软化

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摘要

Nanoindentation tests of Pd_(40)Cu_(30)Ni_(10)P_(20) bulk metallic glass were performed over a wide range of indentation rates (from 0.04 up to 6.4 mN s~(-1)) under the standard load control mode. New results using the feedback displacement control mode are also presented. The dependence of the pop-in formation on the loading rate is investigated. Variations in hardness and reduced elastic modulus as a function of the indentation rate are observed. A softening effect occurs when increasing the loading rate. This is explained by the differences in plastic deformation achieved at different indentation rates. The displacement control mode was used to avoid the shear localization of the free volume, leading to the almost complete absence of pop-ins along the loading curve. The obtained results suggest that plastic flow in bulk metallic glasses is governed by the rate of creation of free volume, which depends on the strain rate and its localization into shear bands.
机译:在标准负载控制下,在较大的压痕率范围(从0.04到6.4 mN s〜(-1))上进行了Pd_(40)Cu_(30)Ni_(10)P_(20)大块金属玻璃的纳米压痕测试。模式。还介绍了使用反馈位移控制模式的新结果。研究了弹入式结构对加载速率的依赖性。观察到硬度和降低的弹性模量随压痕率的变化。当增加加载速率时会出现软化效果。这可以通过在不同压痕率下获得的塑性变形差异来解释。位移控制模式用于避免自由体积的剪切局部化,从而导致沿加载曲线几乎完全没有弹出物。获得的结果表明,散装金属玻璃中的塑性流动受自由体积产生速率的控制,自由体积的生成速率取决于应变速率及其在剪切带中的定位。

著录项

  • 来源
    《Journal of Materials Research》 |2005年第10期|p.2719-2725|共7页
  • 作者单位

    Departament de Fisica, Facultat de Ciencies, Edifici Cc, Universitat Autonoma Barcelona, 08193 Bellaterra, Barcelona, Spain;

  • 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 工程材料学;
  • 关键词

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