Excellent work-hardening in ZrCu/NiNb amorphous/amorphous nanolaminates

Work-hardening behavior could be rarely observed in amorphous alloys during plastic deformation because the dilation and softening effect often occur in shear bands. Here, we proposed a novel mechanism to realize an excellent work-hardening rate (R=dσdε) in ZrCu/NiNb amorphous/amorphous nanolaminate...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2022-01, Vol.831, p.142277, Article 142277
Main Authors: Huang, L., Huang, P., Wang, F.
Format: Article
Language:English
Subjects:
Amorphous alloy
Amorphous alloys
Compression tests
Deformation effects
Edge dislocations
Hardening rate
Heterogeneity
Interfaces
Laminates
Metallic glasses
Percolation
Plastic deformation
Shear bands
Shear transformation zones
Thickness
Work-hardening
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Summary:Work-hardening behavior could be rarely observed in amorphous alloys during plastic deformation because the dilation and softening effect often occur in shear bands. Here, we proposed a novel mechanism to realize an excellent work-hardening rate (R=dσdε) in ZrCu/NiNb amorphous/amorphous nanolaminates (A/ANLs), which is investigated by in-situ uniaxial micro-pillar compression tests. The work-hardening rate value (25.24 GPa) obtained in ZrCu/NiNb A/ANLs with single layer thickness (h) 5 nm and volume ration 1:1, is relatively high, when comparing with the values in other results that considered the effect of crystalline phases and structural heterogeneity on work-hardening rate in composites. Such a high work-hardening effect is attributed to serious suppression of shear transformation zones (STZs) percolation by amorphous/amorphous interfaces. This work-hardening effect increased sharply as h decreases to 5 nm.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2021.142277