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Accumulative Rolling Bonding (ARB) Cu/Nb Nanolaminates have been widely observed to exhibit unique and sheer amount of interface-based plasticity mechanisms, and these have been associated with the many extraordinary properties of the material system, especially resistances in extreme engineering environments (mechanical/pressure, thermal, irradiation, etc.) and self-healing ability from defects (microstructural, as well as radiation-induced). Recently, anisotropy in the interface shearing mechanisms in the material system have been observed and much discussed. The Cu/Nb nanolaminates appear to shear on the interface planes to a much larger extent in the Transverse Direction (TD), compared to the Rolling Direction (RD) of the ARB process. Related to that, in this present study we observe interface rotation in Cu/Nb ARB nanolaminates under constrained and unconstrained loading conditions. Both have nominally primary driving forces for interface shearing only in one particular direction, ie. RD, but additional shearing in TD was evident. This is significant as it represents an interface rotation, while there was no external rotational driving force. First, we observed interface rotation in in situ rectangular micropillar compression experiments, where the interface is simply sheared in one particular direction only, ie. in RD.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: multilayers, nanolaminates, interface-based plasticity mechanism, nanoplasticity

Date published: 2025-10-07

Publisher: MDPI AG

Journal:

• Nanomaterials (ISSN: 20794991) vol. 15 issue. 19

Funding:

• Oregon Renewable Energy Center OREC2024/060/HPPT
• e-ASIA Joint Research Program JSPS KAKENHI Grant No. 23H04464
• e-ASIA Joint Research Program JST SICORP Grant No. JPMJSC21E1
• A*STAR A18B1b0061
• the Agence Nationale de la Recherche (ANR) of the French government ANR18-09CE-003801
• the National Research Foundation (NRF) of the Singaporean government NRF2018-NRF-ANR042
• Oregon Renewable Energy Center OREC2023/060/WIND

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.3390/nano15191528

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Updated at: 2025-10-28 12:30:21 +0900

Published on MDR: 2025-10-28 12:16:21 +0900