2023-03-14 ノースカロライナ州立大学(NCState)
研究者たちは、これらのテスト技術の基本的な能力を進め、極端に高温または低温で同様の情報を収集できるようにすることを目指しています。研究論文は、Scripta MaterialiaとSurfaces and Interfacesで発表され、研究はPacific Northwest National Laboratoryの支援を受けて行われました。
＜関連情報＞
- https://news.ncsu.edu/2023/03/new-insight-materials-stresses/
- https://www.sciencedirect.com/science/article/abs/pii/S1359646223001276?via%3Dihub
- https://www.sciencedirect.com/science/article/abs/pii/S2468023023000834?via%3Dihub
マイクロメカニカルテストによる純CuおよびCu/Nbナノラミネートのせん断変形 Shear deformation of pure-Cu and Cu/Nb nano-laminates using micromechanical testing
Tanvi Ajantiwalay, Xiaolong Ma, Anqi Yu, Mayur Pole, Joshua Silverstein, Suveen Mathaudhu, Arun Devaraj, Bharat Gwalani
Scripta Materialia Available online: 11 March 2023
DOI:https://doi.org/10.1016/j.scriptamat.2023.115403
Abstract
Solid phase processing by introducing shear deformation into materials can result in unique microstructure evolution and enhanced mechanical properties, especially for immiscible systems such as Cu/Nb. To better understand the correlation between microstructure and deformation behavior during shear, a dedicated testing design of stress localization at predicted sites is necessary. In this study, a specialized S-shaped specimen geometry is implemented to apply localized simple-shear loading in pure-Cu and Cu/Nb accumulative roll-bonded nanolaminates. The nanoscale microstructure and proximity of interfaces in Cu/Nb offer a ∼2.8-fold increase in shear stresses than pure-Cu. In pure-Cu, the plastic instability causes shear banding and an in-plane lattice rotation. In Cu/Nb, a partial bending of the interfaces occurred, resulting in a localized lattice rotation. The adapted geometry for micro-scale specimens thus successfully captures the shear deformation at predicted sites in two distinct material systems and could potentially be a powerful technique to study the deformation mechanisms.
Surfaces and Interfaces
