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Plastic deformation modes of CuZr/Cu multilayers

  • We synthesized CuZr/Cu multilayers and performed nanoindentation testing to explore the dependence of plastic deformation modes on the thickness of CuZr layers. The Cu layers were 18 nm thick and the CuZr layers varied in thickness from 4 nm to 100 nm. We observed continuous plastic co-deformation in the 4 nm and 10 nm CuZr − 18 nm Cu multilayers and plastic-induced shear instability in thick CuZr layers (>20 nm). The plastic co-deformation is ascribed to the nucleation and interaction of shear transformation zones in CuZr layers at the adjacent interfaces, while the shear instability is associated with the nucleation and propagation of shear bands in CuZr layers. Shear bands are initialized in the CuZr layers due to the accumulated glide dislocations along CuZr-Cu interfaces, and propagate into adjacent Cu layers via slips on {111} plane non-parallel to the interface. Due to crystallographic constraint of the Cu layers, shear bands are approximately parallel to {111} plane in the Cu layer.

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Document Type:Article
Author:Yan Cui, Oscar Torrents AbadORCiD, Fei Wang, Ping Huang, Tian-Jian Lu, Ke-Wei Xu, Jian Wang
Parent Title (English):Scientific Reports
Year of first Publication:2016
Date of final exam:2016/03/17
Release Date:2022/11/18
Tag:behavior; bulk metallic glasses; interfaces; mechanisms; micropillars; nanolayered composites; shear bands; strength; transition
Impact:04.259 (2016)
Funding Information:This work was supported by the National Natural Science Foundation of China (51171141, 51271141 and 51471131) and Program for New Century Excellent Talents in University (NCET-11-0431). JW acknowledges the support provided by University of Nebraska-Lincoln.
Groups:Funktionelle Mikrostrukturen
Open Access:Open Access
Signature:INM 2016/30
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International