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Interface structure and radiation damage resistance in Cu-Nb multilayer nanocomposites
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In this paper, the authors use atomistic simulations to show that misfit dislocations in Cu-Nb interfaces shift between two adjacent planes, forming pairs of extended jogs.Abstract:
We use atomistic simulations to show that upon removal or insertion of atoms, misfit dislocations in Cu-Nb interfaces shift between two adjacent planes, forming pairs of extended jogs. Different jog combinations give rise to interface structures with unlike densities but nearly degenerate energies, making Cu-Nb interfaces virtually inexhaustible sinks for radiation-induced point defects and catalysts for efficient Frenkel pair recombination.read more
Citations
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Efficient annealing of radiation damage near grain boundaries via interstitial emission.
TL;DR: Simulations show that grain boundaries in copper can act as sinks for radiation-induced defects, and find thatgrain boundaries have a surprising “loading-unloading” effect.
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Defect-interface interactions
TL;DR: In this paper, the authors review the present understanding of defect-interface interactions in single-phase and two-phase metal and oxide nanocomposites, emphasizing how interface structure affects interactions with point, line, and planar defects.
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An overview of interface-dominated deformation mechanisms in metallic multilayers
Jian Wang,Amit Misra +1 more
TL;DR: In this paper, the authors show that the atomic structure of the interface leads to low interface shear strength in non-coherent fcc-bcc nanolayered composites such as Cu-Nb.
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Structural phase transformations in metallic grain boundaries
TL;DR: A novel mechanism of radiation damage healing in metals is proposed, which may guide further improvements in radiation resistance of metallic materials through grain boundary engineering.
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High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces
Shijian Zheng,Irene J. Beyerlein,John S. Carpenter,Keonwook Kang,Keonwook Kang,Jian Wang,Weizhong Han,Nathan A. Mara +7 more
TL;DR: This discovery proves that interfaces can be designed within bulk nanostructured composites to radically outperform previously prepared bulk nanocrystalline materials, with respect to both mechanical and thermal stability.
References
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Embedded-atom method: Derivation and application to impurities, surfaces, and other defects in metals
Murray S. Daw,Michael I. Baskes +1 more
TL;DR: In this paper, the authors derived an expression for the total energy of a metal using the embedding energy from which they obtained several ground-state properties, such as the lattice constant, elastic constants, sublimation energy, and vacancy-formation energy.
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Stacking fault energies and slip in nanocrystalline metals
TL;DR: It is shown, using molecular dynamics simulations, that the nature of slip in nanocrystalline metals cannot be described in terms of the absolute value of the stacking fault energy—a correct interpretation requires the generalized stacking faultEnergy curve, involving both stable and unstable stacking fault energies.
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The radiation damage tolerance of ultra-high strength nanolayered composites
TL;DR: In this article, the experimental and atomistic modeling results from a Cu-Nb nanolayered composite are presented to highlight the roles of nanostructuring length scales and the response of interfaces to ion collision cascades in designing composite materials with high radiation damage tolerance.
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An examination of the constitutive equation for elevated temperature plasticity
TL;DR: The constitutive relation that links the stress-strain rate-grain size-temperature relation (Mukherjee-Bird-Dorn, MBD correlation) was presented in 1968/1969 to describe the elevated temperature crystalline plasticity has held up well during the intervening quarter of a century.
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Extended jogs in dislocations in face-centred cubic metals
TL;DR: In this paper, the authors studied the minimum energy configuration of elementary jogs in dislocations in face-centred cubic metals and concluded that long jogs of various types are partially dissociated into intrinsic stacking-fault ribbons on close-packed planes.