Atomic-scale heterogeneity in large-plasticity Cu-doped metallic glasses

JOURNAL OF ALLOYS AND COMPOUNDS

卷:798

Article

Yuan, C. C.^1,2  Lv, Z. W.¹  Pang, C. M.¹  Wu, X. L.²  Lan, S.^2,3  Lu, C. Y.²  Wang, L. G.²  Yu, H. B.⁴  Luan, J. H.⁵  Zhu, W. W.¹  Zhang, G. L.¹  Liu, Q.²  Wang, Xun-Li²  Shen, B. L.¹ 

[1] Southeast Univ, Sch Mat Sci & Engn, Jiangsu Key Lab Adv Metall Mat, Nanjing 211189, Jiangsu, Peoples R China

[2] City Univ Hong Kong, Dept Phys, Kowloon, 83 Tat Chee Ave, Hong Kong, Peoples R China

[3] Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, Nanjing 210094, Jiangsu, Peoples R China

[4] Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Wuhan 430074, Hubei, Peoples R China

[5] City Univ Hong Kong, Ctr Adv Struct Mat, Dept Mat Sci & Engn, Hong Kong, Peoples R China

关键词: Disordered structures;    X-ray scattering;    Elastic moduli;    Deformation and plasticity;    Metallic glasses;   

DOI  :  10.1016/j.jallcom.2019.05.282

来源: Elsevier

【 摘 要 】

By using nanoindentation techniques combined with transmission electron microscope, wide-/small-angle X-ray scattering, and three-dimensional atom probe tomography, the sub-nanometer- to nanometer-length-scale structural heterogeneity due to the precipitation of Co(Fe)-rich clusters was observed in [(Co0.7Fe0.3)(0.68)B0.219Si0.051Nb0.05](100-x)Cu-x (x = 0.5) metallic glasses. Such short-range ordered structure promotes energy dissipation during deformation via regulating intrinsic elastic constants and hardness at the mesoscale, which contributes to the improved compressive plasticity of Cu-doped (Fe, Co)-based metallic glasses. Our work provides new evidence on atomic-scale heterogeneity in Cu-doped metallic glasses from the aspects of topological orders and microscopic mechanical responses. (C) 2019 Elsevier B.V. All rights reserved.

【 授权许可】

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