Results 21 to 30 of about 52,903 (306)
Journal of Materials Research and Technology, 2023 High-density dislocations and nano-twinning are known to significantly influence the work hardening ability of materials, presenting a potent approach for enhancing their overall strength.
Fei Chen +4 more
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Geometrically necessary dislocation densities in olivine obtained using high-angular resolution electron backscatter diffraction [PDF]
, 2016 © 2016 The AuthorsDislocations in geological minerals are fundamental to the creep processes that control large-scale geodynamic phenomena. However, techniques to quantify their densities, distributions, and types over critical subgrain to polycrystal ...
Hansen, L, Wallis, D, Wilkinson, A
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Size-dependent geometrically necessary dislocation structures in single-crystalline tungsten
Journal of Materials Research, 2022 Abstract Wedge indentation experiments were conducted to study the depth dependence of geometrically necessary dislocation (GND) structures in single-crystalline tungsten. Single-crystalline tungsten exhibits a pronounced indentation size effect (ISE), which can be rationalized based on GNDs. The dislocation mechanisms,
Jin Wang +4 more
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Journal of Materials Research and Technology, 2023 It is urgent to explore an efficient treatment strategy to obtain characteristic microstructures for better mechanical properties of alloys in an era of energy shortage.
Yafei Wang +3 more
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The influence of indenter tip rounding on the indentation size effect [PDF]
, 2010 A model was developed to interpret the indentation size effect. The model considers the tip wear effect, causing a rounded tip, the plastic zone size and various strengthening contributions, including geometrically necessary dislocations, preexisting ...
Gao, Nong +2 more
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The role of geometrically necessary dislocations in giving material strengthening [PDF]
Scripta Materialia, 2003 The role of geometrically necessary dislocations in providing macroscopic strengthening is reviewed with particle reinforcement as an examp le. The general relation between the Nye tensor and slipalong a curvilinear slipline net is derived to emphasise the importance of curvature of slip lines upon the rate of dislocation storage.
N.A Fleck, M.F Ashby, J.W Hutchinson
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Advances in Materials, 2020 Crystallographic defects exist in many redox active energy materials, e.g., battery and catalyst materials, which significantly alter their chemical properties for energy storage and conversion. However, there is lack of quantitative understanding of the
Zhengrui Xu +6 more
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Nanoindentation and incipient plasticity [PDF]
, 1999 This paper presents a large-scale atomic resolution simulation of nanoindentation into a thin aluminum film using the recently introduced quasicontinuum method.
Miller, R. +3 more
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Model for the hardness-depth relationships of ion-irradiated nanocrystalline metals
Journal of Materials Research and Technology, 2023 In this work, a mechanistic model is proposed for ion-irradiated nanocrystalline (NC) metals to characterize the evolution of hardness as a function of the indentation depth at room temperature and under quasi-static loading condition. At the grain level,
Kai Liu +4 more
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Formation of grains and dislocation structure of geometrically necessary boundaries [PDF]
Materials Science and Engineering: A, 2015 A continuum dislocation model of formation of grains whose boundaries have a non-vanishing thickness is proposed. For a single crystal deforming in simple shear the lamellar structure of grains with thin layers containing dislocations as the geometrically necessary boundaries turns out to be energetically preferable.
Koster, Michael, Le, Khanh Chau
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