J. Mater. Sci. Technol. ›› 2021, Vol. 65: 54-60.DOI: 10.1016/j.jmst.2020.04.081

• Research Article • Previous Articles     Next Articles

Correlation between deformation behavior and atomic-scale heterogeneity in Fe-based bulk metallic glasses

Jing Zhoua, Siyi Dia, Baoan Sunb, Qiaoshi Zenga, Baolong Shena,c,*()   

  1. aSchool of Materials Science and Engineering, Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing 211189, China
    bInstitutes of Physics, Chinese Academy of Sciences, Beijing 100190, China
    cInstitute of Massive Amorphous Metal Science, China University of Mining and Technology, Xuzhou 221116, China
  • Received:2020-02-27 Revised:2020-04-09 Accepted:2020-04-10 Published:2021-02-28 Online:2021-03-15
  • Contact: Baolong Shen
  • About author:* School of Materials Science and Engineering, JiangsuKey Laboratory for Advanced Metallic Materials, Southeast University, Nanjing211189, China.E-mail address: blshen@seu.edu.cn (B. Shen).

Abstract:

The correlation betweent deformation behavior and atomic-scale heterogeneity of bulk metallic glasses (BMGs) is critical to understand the BMGs’ deformation mechanism. In this work, three typical [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4, Fe39Ni39B14.2Si2.75P2.75Nb2.3, and Fe50Ni30P13C7 BMGs exhibiting different plasticity were selected, and the correlation between deformation behavior and atomic-scale heterogeneity of Fe-based BMGs was studied. It is found that the serrated flow dynamics of Fe-based BMGs transform from chaotic state to self-organized critical state with increasing plasticity. This transformation is attributed to the increasing atomic-scale heterogeneity caused by the increasing free volume and short-to-medium range order, which facilitates a higher frequency of interaction and multiplication of shear bands, thereby results in a brittle to ductile transition in Fe-based BMGs. This work provides new evidence on heterogeneity in plastic Fe-based BMGs from the aspects of atomic-scale structure, and provides new insight into the plastic deformation of Fe-based BMGs.

Key words: Fe-based BMG, Plasticity, Serrated flow behavior, Atomic-scale, Heterogeneity