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Plastic Deformation Modes of CuZr/Cu Multilayers.

ABSTRACT: 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.

SUBMITTER: Cui Y

PROVIDER: S-EPMC4794738 | biostudies-literature | 2016 Mar

REPOSITORIES: biostudies-literature

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Plastic Deformation Modes of CuZr/Cu Multilayers.

Cui Yan Y Abad Oscar Torrents OT Wang Fei F Huang Ping P Lu Tian-Jian TJ Xu Ke-Wei KW Wang Jian J

Scientific reports 20160317

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 ...[more]

PMID: 26984537

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