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Twin Boundary Sliding in Single Crystalline Cu and Al Nanowires

31 Pages Posted: 10 Jan 2020 Publication Status: Accepted

See all articles by Sung-Hoon Kim

Sung-Hoon Kim

Korea University - Department of Materials Science and Engineering

Jun-Hyoung Park

Korea University - Department of Materials Science and Engineering

Hong-Kyu Kim

Korea Institute of Science and Technology (KIST) - Advanced Analysis Center

Jae-Pyoung Ahn

Korea Institute of Science and Technology (KIST) - Advanced Analysis Center

Dong-Mok Whang

Sungkyunkwan University - School of Advanced Materials Science & Engineering

Jae-Chul Lee

Korea University - Department of Materials Science and Engineering

Abstract

Twin boundary sliding (TBS) is a deformation mode that is typically observed in nanocrystalline metals and usually observed during the final deformation stage when deformation via twinning is limited. Unlike the well-established dislocation slip and necking deformation process that occurs in large crystals, recent theories that explain TBS are often controversial, and much remains unsettled. Herein, we develop a theory that enables the prediction of deformation pathways by quantitatively analyzing the relative tendency for the formation of partial dislocations based on the dislocation and fault energy theories. The developed theory considers the effects of static features, such as the stacking fault energy (SFE) as well as the crystal size and orientation, and dynamic structural states characterized by the various fault energies of a material. The theory is initially validated using a Cu crystal exhibiting low SFE for various orientations and sizes. In addition, micro-mechanical tensile tests and molecular dynamics simulations are conducted on Al nanowires to determine whether the proposed theory can be generically extended to crystals with high SFE. The developed theory produces self-consistent results even for metals exhibiting different SFE values. The observations can be used as a guideline to design nanoscale structures for load-carrying applications.

Keywords: Nanoscale crystals, Deformation twinning, Plastic deformation, Boundary sliding, face-centered cubic

Suggested Citation

Kim, Sung-Hoon and Park, Jun-Hyoung and Kim, Hong-Kyu and Ahn, Jae-Pyoung and Whang, Dong-Mok and Lee, Jae-Chul, Twin Boundary Sliding in Single Crystalline Cu and Al Nanowires. Available at SSRN: https://ssrn.com/abstract=3513123 or http://dx.doi.org/10.2139/ssrn.3513123

Sung-Hoon Kim (Contact Author)

Korea University - Department of Materials Science and Engineering

Seoul, 02841
Korea, Republic of (South Korea)

Jun-Hyoung Park

Korea University - Department of Materials Science and Engineering

Seoul, 02841
Korea, Republic of (South Korea)

Hong-Kyu Kim

Korea Institute of Science and Technology (KIST) - Advanced Analysis Center

Seoul, 02792
Korea, Republic of (South Korea)

Jae-Pyoung Ahn

Korea Institute of Science and Technology (KIST) - Advanced Analysis Center

Seoul, 02792
Korea, Republic of (South Korea)

Dong-Mok Whang

Sungkyunkwan University - School of Advanced Materials Science & Engineering

Korea, Republic of (South Korea)

Jae-Chul Lee

Korea University - Department of Materials Science and Engineering ( email )

Seoul, 02841
Korea, Republic of (South Korea)

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