Results 21 to 30 of about 1,319 (250)
Geometrically necessary dislocation density distributions in cyclically deformed Ti–6Al–4V
Acta Materialia, 2012 Abstract Cross-correlation-based electron backscattering diffraction analysis has been used to map lattice rotations in Ti–6Al–4V polycrystals deformed by load-controlled fatigue and dwell fatigue including a hold at maximum load. The lattice curvatures were used to form lower bound estimates of the geometrically necessary dislocation (GND) density ...
Littlewood, P, Wilkinson, A
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International Journal of Plasticity, 2018 66 pages, 15 figures, 7 ...
Suchandrima Das +2 more
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Geometrically necessary dislocation densities in olivine obtained using high-angular resolution electron backscatter diffraction [PDF]
Ultramicroscopy, 2016 Dislocations 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 length scales are limited.
Wallis, D +3 more
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Materials & DesignIn the net-zero era, the burgeoning demands within engineering applications require materials that are not only lighter and stronger but also ductile.
Yi-Hsuan Sun +6 more
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Nanomaterials, 2021 We report on cooperative grain rotation accompanied by a strong Bauschinger effect in nanocrystalline (nc) palladium thin film. A thin film of nc Pd was subjected to cyclic loading–unloading using in situ TEM nanomechanics, and the evolving ...
Ankush Kashiwar +2 more
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γʹ and γ″ co-precipitation phenomena in directly aged Alloy 718 with high δ-phase fractions
Materials & DesignCo-precipitation of γ′ and γ′′ is the main strengthening mechanism that provides superior high-temperature strength in directly aged Alloy 718 aerospace parts.
Vitor V. Rielli +6 more
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In-situ observation of dislocation dynamics near heterostructured interfaces
Materials Research Letters, 2019 There has been a long-standing controversy on how dislocations interact with interfaces. Here we report in-situ observations that in a Cu–brass heterostructured TEM film Frank–Read sources are the primary dislocation sources. They were dynamically formed
Hao Zhou +10 more
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Crystal Plasticity Modeling of Dislocation Density Evolution in Cellular Dislocation Structures
MetalsThe complex thermal cycles during the solidification process in metal additive manufacturing (AM) lead to the formation of high-density dislocation networks, organizing into submicron-scale cellular structures.
Md Mahabubur Rohoman, Caizhi Zhou
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Materials & Design, 2021 Relationships between microstructures and hardening nature of laser powder bed fused (L-PBF) 316 L stainless steel have been studied. Using integrated experimental efforts and calculations, the evolution of microstructure entities such as dislocation ...
Luqing Cui +5 more
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Materials Characterization, 2023 The strength of pearlitic wires can be increased by cold-drawing to a world record level for bulk ductile materials of 7 GPa. The underlying strengthening mechanisms are not fully understood, as the application of usual characterization is challenging because of the small grain sizes and the high degree of deformation.
Li, Y., Goto, S., Kostka, A., Herbig, M.
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