Grain boundaries and crystalline plasticity
WebIn grain-boundary strengthening, ... Impeding this dislocation movement will hinder the onset of plasticity and hence increase the yield strength of the material. Under an applied stress, existing dislocations and dislocations generated by Frank–Read sources will move through a crystalline lattice until encountering a grain boundary, where ... WebApr 3, 2024 · This study investigated the relationship between the Σ3 boundaries, dislocation slip, and plasticity in pure nickel wires after grain boundary (GB) …
Grain boundaries and crystalline plasticity
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WebGrain boundaries and crystalline plasticity / edited by Louisette Priester. p. cm. Includes bibliographical references and index. ISBN 978-1-84821-327-2 1. Grain boundaries--Mathematical models. 2. Crystalline interfaces. 3. Dislocations in crystals. I. Priester, Louisette. QC173.458.C78G77 2011 660'.284298--dc23 2011034862 WebAug 1, 2016 · A three-dimensional grain-boundary formulation for small strains crystal plasticity is presented for the first time. The method is developed and implemented for …
WebFeb 1, 2024 · Non-equilibrium molecular dynamics simulations have been used to investigate strain-rate dependence of plasticity and phase transition in [001]-oriented single-crystal iron under ramp compression. Here, plasticity is governed by deformation twinning, in which kinetics is tightly correlated with the loading rate. Over the investigated … WebSep 18, 2024 · CSNs with Al substrate (5 nm and 10 nm core radii) obtained 100% recovery from plasticity and retained its crystal structure after unloading when the core is single crystal or contains a symmetric tilt grain boundary. Moreover, a single-crystal core can withstand nanoindentation to 100% of the shell thickness, whereas a symmetric tilt grain ...
WebMay 1, 2016 · Abstract and Figures. A three-dimensional grain-boundary formulation for small strains crystal plasticity is presented for the first time. The method is developed … WebAug 1, 2014 · Comparison of crystal plasticity finite element simulations of quasi-3D (columnar grain model) and true 3D microstructures with experimental characterization reveal the need to have a good representation of the 3D microstructure in order to analyze the local deformation behavior involved in strain transfer at grain boundaries.
WebThe effect of grain size on the flow strength of FCC polycrystals was analyzed by means of computational homogenization. The mechanical behavior of each grain was dictated by a dislocation-based crystal plasticity model in the context of finite strain plasticity and takes into the account the formation of pile-ups at grain boundaries.
WebApr 7, 2024 · When the dislocations move to the grain boundaries, they pile up and resist the movement of other dislocations. According to the Hall-Petch relationship, the required stress (τ) for dislocation movement across grain boundaries can be expressed as: (9) τ HP α = K d D − 1 2 where K d is the grain boundary strengthening factor and D is the ... phillip scheffskyWebIt starts with the atomic description of a grain boundary, moves on to the elemental interaction processes between dislocations and grain boundaries, and finally shows how the microscopic phenomena … phillips charter school paterson njWebIn nanocrystalline solids, grain boundaries become a significant volume fraction of the material, with profound effects on such properties as diffusion and plasticity. In the limit of small crystallites, as the volume fraction of grain boundaries approaches 100%, the material ceases to have any crystalline character, and thus becomes an ... try to imageWebDescription. This book explores the fundamental role of grain boundaries in the plasticity of crystalline materials, providing a multi-scale approach to plasticity to facilitate … try to idiomWebNov 30, 2024 · In practice, most components often receive impact loads during service. In order to ensure the service safety of components, impact toughness evaluation is essential. To the best of our knowledge, the previous studies were mainly focused on the quasi-static tensile deformation, and the impact toughness of bimodal grain structured metals have … try to impress by associationWebSep 16, 2024 · For this purpose, we have developed a three-level statistical crystal plasticity constitutive model of polycrystalline metals and alloys, which takes into … try to imagine what will happenWebNov 30, 2011 · This book explores the fundamental role of grain boundaries in the plasticity of crystalline materials, providing a multi-scale approach to plasticity to … phillips chamber