On the shear-affected zone of shear bands in bulk metallic glasses

JOURNAL OF ALLOYS AND COMPOUNDS

卷:837

Article

Davani, Farnaz A.¹  Hilke, Sven¹  Roesner, Harald¹  Geissler, David²  Gebert, Annett²  Wilde, Gerhard¹ 

[1] Westfalische Wilhelms Univ Munster, Inst Mat Phys, Wilhelm Klemm Str 10, D-48149 Munster, Germany

[2] Leibniz IFW Dresden, Inst Complex Mat IKM, Helmholtzstr 20, D-01069 Dresden, Germany

关键词: Bulk metallic glass;    Medium-range order;    Deformation;    Shear band;    Fluctuation electron microscopy;   

DOI  :  10.1016/j.jallcom.2020.155494

来源: Elsevier

【 摘 要 】

Notched bars of bulk metallic glasses, Pd40Ni40P20 and Zr52.5Cu17.9Ni14.6Al10Ti5 (Vit105), were deformed under 3-point bending conditions, resulting in the formation of shear bands before failure. The immediate environment of shear bands was investigated in detail using fluctuation electron microscopy to extract information on the strain-induced modification of the medium-range order (MRO) and its lateral extension. Characteristic material-independent gradients were observed for the tensile and compressive sides of the samples indicating the impact of the local stress state on the MRO. Our results based on structural changes of the MRO suggest an upper limit of a few microns for the lateral extension of the shear-affected environments of shear bands. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

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