Results 11 to 20 of about 32,459 (292)
Measuring grain rotation at the nanoscale [PDF]
High Pressure Research, 2017 ABSTRACTIn this paper, we introduced a method to measure grain rotation of nanomaterials under external stress using a high pressure diamond anvil cell and the Laue microdiffraction technique at a synchrotron facility. We used tungsten carbide marker crystals to investigate grain rotation activities of 3 and 500 nm nickel media.
Zhou, Xiaoling +5 more
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An energy approach to predict electromigration induced grain rotation under high current density
Theoretical and Applied Mechanics Letters, 2019 An energy approach is proposed to describe the electromigration induced grain rotation under high current density. The driving force is assumed to arise from the grain-boundary energy reduction and increase of the inner energy from the joule heating ...
Yuexing Wang, Yao Yao
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Reversal in the Size Dependence of Grain Rotation [PDF]
Physical Review Letters, 2017 The conventional belief, based on the Read-Shockley model for the grain rotation mechanism, has been that smaller grains rotate more under stress due to the motion of grain boundary dislocations. However, in our high-pressure synchrotron Laue x-ray microdiffraction experiments, 70 nm nickel particles are found to rotate more than any other grain size ...
Zhou, Xiaoling +9 more
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Quality of winter soft wheat grain under the influence of repeated and intermediate sowing in cotton-grain rotation [PDF]
E3S Web of Conferences, 2023 Research work was carried out in 2017-2020 in a system of cotton-grain crop rotation on light gray soils of the Kashkadarya region of the Republic of Uzbekistan.
Bakhramova N.N. +4 more
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Numerical Investigation on Hybrid Rocket Motors with Star-Segmented Rotation Grain
Aerospace, 2022 A novel fuel grain configuration comprising two star-segmented grains is proposed. The effect of the rotation, mid-chamber length, and segmented position on the fuel regression rate and the combustion efficiency in hybrid rocket motors with star ...
Hui Tian +5 more
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Study on the Grain Rotation of High-Purity Tantalum during Compression Deformation
Crystals, 2022 A compression experiment with electron backscatter diffraction (EBSD) measurements was designed to characterize the effect of the microtexture on the grain rotation process.
Qianqian Zhu +6 more
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Grain Rotation as a Mechanism of Grain Growth in Nanocrystalline Materials [PDF]
, 2003 Grain-boundary (GB) properties in a polycrystalline system are generally anisotropic; in particular, both the GB energy and mobility depend on the GB misorientation. Moreover, in nanocrystalline materials, in which the grain size is less than 100 nm, grain rotations leading to the coalescence of neighboring grains via elimination of the common GB ...
Moldovan, D. +3 more
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ROTATION OF GRAINS OF METAL TIPS (ANNIHILATION OF GRAIN BOUNDARIES)
Le Journal de Physique Colloques, 1986 Experiments in a scanning electron microscope are described which enable in situ studies of the morphological evolution of metal tips (Au). The existence of a rotation of the grains of a polycrystalline tip, which leads to an annihilation of grain boundaries, is directly visualized, measured and interpreted.
Drechsler, M., Ramdani, S.
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Disorientation of Suprathermally Rotating Grains and the Grain Alignment Problem [PDF]
The Astrophysical Journal, 1997 We discuss the dynamics of dust grains subjected to uncompensated torques arising from H_2 formation. In particular, we discuss grain dynamics when a grain spins down and goes through a ``crossover''. As first pointed out by Spitzer & McGlynn (1979), the grain angular momentum before and after a crossover event are correlated, and the degree of ...
Lazarian, A., Draine, B. T.
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Microstructural evolution and oxidation in α/β titanium alloy under fretting fatigue loading
Friction, 2023 Coupling effects of fretting wear and cyclic stress could result in significant fatigue strength degradation, thus potentially causing unanticipated catastrophic fractures. The underlying mechanism of microstructural evolutions caused by fretting wear is
Hanqing Liu +7 more
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