Coherent twin boundaries (CTBs) are internal interfaces that can play a key role in markedly enhancing the strength of metallic materials while preserving their ductility. They are known to accommodate plastic deformation primarily through their migration, while experimental evidence documenting large-scale sliding of CTBs to facilitate deformation has thus far not been reported. We show here that CTB sliding is possible whenever the loading orientation enables the Schmid factors of leading and trailing partial dislocations to be comparable to each other. This theoretical prediction is confirmed by real-time transmission electron microscope experimental observations during uniaxial deformation of copper pillars with different orientations and is further validated at the atomic scale by recourse to molecular dynamics simulations. Our findings provide mechanistic insights into the evolution of plasticity in heavily twinned face-centered cubic metals, with the potential for optimizing mechanical properties with nanoscale CTBs in material design.
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http://dx.doi.org/10.1038/s41467-017-01234-8 | DOI Listing |
RSC Adv
November 2024
State Key Laboratory of Advanced Metal Materials, University of Science & Technology Beijing Beijing 102206 China.
Fe-Ni nanowires (NWs) containing coherent twin boundaries (CTBs) have received widespread attention in recent years owing to their unique chemical properties. It is important to understand the influence of CTBs on the deformation mechanism of Fe-Ni alloy NWs to develop functional materials based on Fe-Ni alloy NWs. The deformation process of BCC Fe-Ni NWs containing several CTBs under uniaxial stretching was simulated using the molecular dynamics method.
View Article and Find Full Text PDFSmall
January 2025
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
BiTe-based alloys have historically dominated the commercial sector of near-ambient-temperature thermoelectric technology. However, the massive intrinsic defects form the "donor-like" effect and affect the transport properties of BiSbTe significantly. Here, it is demonstrated that the over-stoichiometric Sb fills Te vacancies and weakens the defect scattering, resulting in a desirable carrier mobility.
View Article and Find Full Text PDFOphthalmic Genet
November 2024
Aier Eye Hospital, Jinan University, Guangzhou, China.
Eur Heart J Case Rep
November 2024
Department of Cardiology, CHU Clermont-Ferrand, CNRS, Université Clermont Auvergne, 58 rue Montalembert, 63000 Clermont-Ferrand, France.
Background: Spontaneous coronary artery dissection (SCAD) remains a rare form of acute coronary syndrome (ACS) in young women. It is not always easy to diagnose and its management can be complex, particularly in the case of severe forms.
Case Summary: A 29-year-old Mahorese woman presented with non-ST-elevation acute coronary syndrome 72 h after vaginal delivery of an uncomplicated twin pregnancy.
Front Hum Neurosci
October 2024
Neurosignal Laboratory, Department of Health Informatics, Graduate School of Informatics, Middle East Technical University, Ankara, Türkiye.
This brief report revisits the earliest known hyperscanning study published in 1965, which examined simultaneous EEG recordings of identical twins separated by six meters. The original study's findings suggested that eye closure in one twin elicited alpha activity in the other, despite physical separation. Leveraging contemporary signal processing techniques, we reanalyzed the digitized data to validate their findings.
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