Results 21 to 30 of about 304 (202)

Influence of misorientation angle and local dislocation density on β-phase distribution in Al 5xxx alloys

Scientific Reports, 2022
Al–Mg alloys undergo sensitization when exposed to elevated temperatures, making them susceptible to intergranular corrosion and stress corrosion cracking. Most of the existing research on microstructure effects on sensitization is centered on the effect
Jahnavi Desai Choundraj, Josh Kacher
doaj   +1 more source

Plasticity of crystals and interfaces: From discrete dislocations to size-dependent continuum theory [PDF]

Theoretical and Applied Mechanics, 2010
In this communication, we summarize the current advances in size-dependent continuum plasticity of crystals, specifically, the rate-independent (quasistatic) formulation, on the basis of dislocation mechanics.
Mesarovic Sinisa Đ.
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Consistent determination of geometrically necessary dislocation density from simulations and experiments

International Journal of Plasticity, 2018
66 pages, 15 figures, 7 ...
Suchandrima Das, Felix Hofmann, Edmund Tarleton   +2 more
openaire   +2 more sources

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, Hansen, L, Britton, T, Wilkinson, A   +3 more
openaire   +4 more sources

Local measurement of geometrically necessary dislocation densities and their strengthening effect in ultra-high deformed pearlite

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.
openaire   +2 more sources

Strain-hardening resilience via the cooperation of geometrically necessary dislocations and deformation twins in a strong and ductile lightweight high-entropy steel

Materials & Design
In 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, Shi-Wei Chen, Zen-Hao Lai, Shao-Lun Lu, Yi-Ting Lin, Jui-Fan Tu, Hung-Wei Yen   +6 more
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γʹ and γ″ co-precipitation phenomena in directly aged Alloy 718 with high δ-phase fractions

Materials & Design
Co-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, Ehsan Farabi, Flora Godor, Christian Gruber, Aleksandar Stanojevic, Bernd Oberwinkler, Sophie Primig   +6 more
doaj   +1 more source

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, Chongxiang Huang, Xuechao Sha, Lirong Xiao, Xiaolong Ma, Heinz Werner Höppel, Mathias Göken, Xiaolei Wu, Kei Ameyama, Xiaodong Han, Yuntian Zhu   +10 more
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In Situ TEM Observation of Cooperative Grain Rotations and the Bauschinger Effect in Nanocrystalline Palladium

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, Horst Hahn, Christian Kübel   +2 more
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Crystal Plasticity Modeling of Dislocation Density Evolution in Cellular Dislocation Structures

Metals
The 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
doaj   +1 more source