4.7 Article

Pronounced fl-relaxation in plastic FeNi-based bulk metallic glasses and its structural origin

期刊

INTERMETALLICS
卷 136, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2021.107234

关键词

FeNi-Based BMG; fl-relaxation; Plasticity; Structural heterogeneity; Atomic-scale structure

资金

  1. Guangdong Major Project of Basic and Applied Basic Research, China [2019B030302010]
  2. National Natural Science Foundation of China [51631003, 51871054, U2032219]
  3. Department of Energy (DOE) Office of Science [DE-AC02-06CH11357]

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This study reveals a distinct fl-relaxation behavior and excellent plasticity in FeNi-based BMGs, which is attributed to the structural heterogeneity playing a key role in their dynamics, leading to a large amount of loosely packed regions. The pronounced fl-relaxation is also found to have a good correlation with the plasticity for the FeNi-based BMGs, providing potential guidance for the development of plastic BMGs from an atomic structural and glass dynamic perspective.
Fe-based bulk metallic glasses (BMGs) usually exhibit brittle behavior and unconspicuous fl-relaxation in their dynamic mechanical spectroscopy. We report a distinct fl-relaxation behavior in FeNi-based BMGs with excellent plasticity. The origin of pronounced fl-relaxation and plastic behaviors for the FeNi-based BMGs were investigated by synchrotron X-ray diffraction and nanoindentation tests in detail. It is found that the structural heterogeneity plays a key role in the dynamic of the FeNi-based BMGs, leading to large amount of loosely packed regions. The pronounced fl-relaxation is also found to have a good correlation with the plasticity for the FeNibased BMGs. This study might provide guidance for us to develop plastic BMGs from an atomic structural and glass dynamic perspective.

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