Kim, Sung-Hoon Kim, Hong-Kyu Seo, Jong-Hyun Whang, Dong-Mok Ahn, Jae-Pyoung Lee, Jae-Chul 2024-01-19T21:31:47Z 2024-01-19T21:31:47Z 2021-09-05 2018-11 1359-6454 https://pubs.kist.re.kr/handle/201004/120729 Recent studies have demonstrated that many metal nanowires (NWs) with low stacking-fault energies display ultrahigh strength and can accommodate large plastic strains by spreading mechanical twins throughout the entire volume of the NWs. This previous observation on the plasticity, however, is largely different from that exhibited by Al NWs. In situ tensile tests performed on the < 110 > Al NW revealed that the NW exhibited ultrahigh strength (similar to 2.7 GPa) and superelasticity (similar to 4.8%), while contrary to expectations, it failed quickly once plastic flow initiates and displayed a limited plasticity (similar to 1.2%). This low plasticity was attributed to the formation of thin-layered twins with a zigzag configuration. Upon further deformation, these twins self-locked with each other, which prevented the NWs from carrying further plastic strains. Here, by employing the in situ micro-mechanical test and the atomic simulations, we performed quantitative and comprehensive analyses to explore why Al NWs display ultrahigh strength and how twins with a zigzag configuration are formed in the Al NWs. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. English Elsevier BV Deformation twinning of ultrahigh strength aluminum nanowire Article 10.1016/j.actamat.2018.08.047 1 Acta Materialia, v.160, pp.14 - 21 Acta Materialia 160 14 21 N scie scopus 000447576600002 2-s2.0-85052880560 Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science Metallurgy & Metallurgical Engineering Article MOLECULAR-DYNAMICS SIMULATION CENTERED-CUBIC METALS FREE AU NANOWIRES DISLOCATION NUCLEATION NANOCRYSTALLINE ALUMINUM MECHANICAL-PROPERTIES FCC METALS ENERGY AL SURFACE In situ tension test Aluminum Nanowire Deformation twinning MD simulation