Unusual size effects from tilted twin boundaries in nano-twinned metals
نویسندگان
چکیده
منابع مشابه
Defective twin boundaries in nanotwinned metals.
Coherent twin boundaries (CTBs) are widely described, both theoretically and experimentally, as perfect interfaces that play a significant role in a variety of materials. Although the ability of CTBs in strengthening, maintaining the ductility and minimizing the electron scattering is well documented, most of our understanding of the origin of these properties relies on perfect-interface assump...
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Synthesis of nano-twinned pure Cu by Lu et al. [L. Lu, R. Schwaiger, Z. W. Shan, M. Dao, K. Lu, S. Suresh, Nano-sized twins induce high rate sensitivity of flow stress in pure copper, Acta Mater. 53 (2005) 2169–2179] has produced materials with extremely attractive properties of combined high strength, strain rate sensitivity, and ductility adequate for applications. This note explores the unde...
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Nano-twinned copper exhibits an unusual combination of ultrahigh strength and high ductility, along with increased strain-rate sensitivity. We develop a mechanistic framework for predicting the rate sensitivity and elucidating the origin of ductility in terms of the interactions of dislocations with interfaces. Using atomistic reaction pathway calculations, we show that slip transfer reactions ...
متن کاملUniaxial Compression Behavior of Bulk Nano-twinned Gold from Molecular Dynamics Simulation
Parallel molecular dynamics simulations were used to study the influence of pre-existing growth twin boundaries on the slip activity of bulk gold under uniaxial compression. The simulations were performed on a 3D, fully periodic simulation box at 300 K with a constant strain rate of 4×10 s. Different twin boundary interspacings from 2 nm to 16 nm were investigated. The strength of bulk nano-twi...
متن کاملTwin Boundaries merely as Intrinsically Kinematic Barriers for Screw Dislocation Motion in FCC Metals
Metals with nanoscale twins have shown ultrahigh strength and excellent ductility, attributed to the role of twin boundaries (TBs) as strong barriers for the motion of lattice dislocations. Though observed in both experiments and simulations, the barrier effect of TBs is rarely studied quantitatively. Here, with atomistic simulations and continuum based anisotropic bicrystal models, we find tha...
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ژورنال
عنوان ژورنال: Extreme Mechanics Letters
سال: 2019
ISSN: 2352-4316
DOI: 10.1016/j.eml.2019.100571