Bending behavior and fracture surface characters for FeSiB amorphous ribbons in different free volume state
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Bending behavior and fracture surface characters for FeSiB amorphous ribbons in different free volume state Weiwei Dong1,3 · Bin Han1 · Jiaqi Hui1 · Mi Yan2,3 Received: 30 April 2020 / Accepted: 23 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The FeSiB amorphous ribbons with monolithic amorphous structure in different free volume state were prepared by annealing the as-cast ribbons at different temperature. The results show that a fairly large amount of free volume for S25 sample, the medium amount of free volume for S250 sample, and the free volume were almost annealed out in S380 sample, and the free volume has great influence on bending behavior and the resultant fracture surface. With the decrease of free volume, the amount of shear bands on the bent crease, bending strain decrease from 1 to 0, critical shear displacement on fracture surface decrease form 3.32 mm decline to ~ 203 nm. Meanwhile, the size of micro-scale vein pattern decreases, the size of nano-scale periodic corrugations increases. The bending strain, shear band density and fracture surface characteristics were discussed via free volume content and shear transform zone size. Keywords Amorphous materials · Deformation and fracture · Fracture surface · Shear band · Free volume
1 Introduction Fe-based amorphous ribbons with excellent soft magnetic properties such as high permeability, low coercivity and low core losses have been wildly applied in transformers, motors, anti-theft labels and inductors field. Stress relief annealing below the crystallization temperature is an effective method to further improve the soft magnetic properties of Fe-based amorphous alloys [1]. However, the decreased plastic deformation, i.e. embrittlement due to annealing for FeSiB amorphous alloy ribbons increases the difficulties in processing and assembling in the industry, which has attracted more and more attention from both industry and academia [2, 3].Free * Weiwei Dong [email protected] * Mi Yan [email protected] 1
College of Mechanical and Engineering, Donghua University, Shanghai 210620, China
2
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
3
Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
volume model [4], a shear transformation zone (SZT) [5], flow unit model, and the tension transformation zone (TTZ) model [6] have been proposed to describe plastic deformation in the past years. Zheng found that the shear bands is related with shear transformation zone volume in Fe-based amorphous alloy. The STZ volume, which decreases apparently after annealing, would increase after CTC treatment [7]. Huang demonstrated that increased annealing time leads to the transition from ductile to more brittle behavior for ZrCuNiAl bulk metallic glass during bending tests [8].Hu revealed that both free volume and structural disorder degree inf
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