Seo, Jong-Hyun Park, Harold S. Yoo, Youngdong Seong, Tae-Yeon Li, Ju Ahn, Jae-Pyoung Kim, Bongsoo Choi, In-Suk 2024-01-20T11:04:29Z 2024-01-20T11:04:29Z 2021-09-04 2013-11 1530-6984 https://pubs.kist.re.kr/handle/201004/127506 Researchers have recently discovered ultrastrong and ductile behavior of Au nanowires (NVVs) through long-ranged coherent-twin-propagation. An elusive but fundamentally important question arises whether the size and surface effects impact the twin propagation behavior with a decreasing diameter. In this work, we demonstrate size-dependent strength behavior of ultrastrong and ductile metallic NWs. For Au, Pd, and AuPd NWs, high ductility of about 50% is observed through coherent twin propagation, which occurs by a concurrent reorientation of the bounding surfaces from {111} to {100}. Importantly, the ductility is not reduced with an increase in strength, while the twin propagation stress dramatically increases with decreasing NW diameter from 250 to 40 nm. Furthermore, we find that the power-law exponent describing the twin propagation stress is fundamentally different from the exponent describing the size-dependence of the yield strength. Specifically, the inverse diameter-dependence of the twin propagation stress is directly attributed to surface reorientation, which can be captured by a surface energy differential model. Our work further highlights the fundamental role that surface reorientations play in enhancing the size-dependent mechanical behavior and properties of metal NWs that imply the feasibility of high efficiency mechanical energy storage devices suggested before. English AMER CHEMICAL SOC SHAPE-MEMORY ALLOYS GOLD NANOWIRES AU ASYMMETRY STRESS NITI PD NANOWHISKERS COMPRESSION PLASTICITY Origin of Size Dependency in Coherent-Twin-Propagation-Mediated Tensile Deformation of Noble Metal Nanowires Article 10.1021/nl402282n 1 NANO LETTERS, v.13, no.11, pp.5112 - 5116 NANO LETTERS 13 11 5112 5116 scie scopus 000327111700019 2-s2.0-84887836421 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article SHAPE-MEMORY ALLOYS GOLD NANOWIRES AU ASYMMETRY STRESS NITI PD NANOWHISKERS COMPRESSION PLASTICITY Nanowires ultrastrong and ductile twin propagation size effect surface energy