Výsledky vyhledávání

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Effect of particle size on the phase transformation behavior and equation of state of Si under hydrostatic loading

Autor: Yesudhas, Sorb, Levitas, Valery I., Lin, Feng, Pandey, K. K., Somayazulu, Maddury

High-pressure synchrotron X-ray diffraction (XRD) studies have been conducted on three types of Si particles (micron, 100 nm, and 30 nm). The pressure for initiation of Si-I->Si-II phase transformation (PT) essentially increases with a reduction in p

Externí odkaz: http://arxiv.org/abs/2402.15092

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Plastic strain-induced olivine-ringwoodite phase transformation at room temperature: main rules and the mechanism of the deep-focus earthquake

Autor: Lin, Feng, Levitas, Valery, Yesudhas, Sorb, Smith, Jesse

Deep-focus earthquakes that occur at 350-660 km are theorized to be caused by strain-induced olivine-spinel phase transformation (PT). We introduce and apply dynamic rotational diamond anvil cell with rough diamond anvils to deform San Carlos olivine

Externí odkaz: http://arxiv.org/abs/2307.11215

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Rules of plastic strain-induced phase transformations and nanostructure evolution under high-pressure and severe plastic flow

Autor: Lin, Feng, Levitas, Valery, Pandey, Krishan, Yesudhas, Sorb, Park, Changyong

Rough diamond anvils (rough-DA) are introduced to intensify all occurring processes during an in-situ study of heterogeneous compression of strongly pre-deformed Zr in diamond anvil cell (DAC). Crystallite size and dislocation density of Zr are getti

Externí odkaz: http://arxiv.org/abs/2305.15737

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Akademický článek

Unusual plastic strain-induced phase transformation phenomena in silicon

Autor: Sorb Yesudhas, Valery I. Levitas, Feng Lin, K. K. Pandey, Jesse S. Smith

Publikováno v: Nature Communications, Vol 15, Iss 1, Pp 1-13 (2024)

Abstract Pressure-induced phase transformations (PTs) in Si, the most important electronic material, have been broadly studied, whereas strain-induced PTs have never been studied in situ. Here, we reveal in situ various important plastic strain-induc

Externí odkaz: https://doaj.org/article/214d1db02477473c9ba7107f4c15fea7

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In-situ study of rules of nanostructure evolution, severe plastic deformations, and friction under high pressure

Autor: Lin, Feng, Levitas, Valery I., Pandey, Krishan K., Yesudhas, Sorb, Park, Changyong

Severe plastic deformations under high pressure are used to produce nanostructured materials but were studied ex-situ. We introduce rough diamond anvils to reach maximum friction equal to yield strength in shear and perform the first in-situ study of

Externí odkaz: http://arxiv.org/abs/2303.13007

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Plastic strain-induced phase transformations in silicon: drastic reduction of transformation pressures, change in transformation sequence, and particle size effect

Autor: Yesudhas, Sorb, Levitas, Valery I., Lin, Feng, Pandey, K. K., Smith, Jesse

Pressure-induced phase transformations (PTs) between numerous phases of Si, the most important electronic material, have been studied for decades. This is not the case for plastic strain-induced PTs. Here, we revealed in-situ various unexpected plast

Externí odkaz: http://arxiv.org/abs/2303.04407

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Rough diamond anvils: Steady microstructure, yield surface, and transformation kinetics in Zr

Autor: Lin, Feng, Levitas, Valery, Pandey, Krishan, Yesudhas, Sorb, Park, Changyong

Study of the plastic flow and strain-induced phase transformations (PTs) under high pressure with diamond anvils is important for material and geophysics. We introduce rough diamond anvils and apply them to Zr, which drastically change the plastic fl

Externí odkaz: http://arxiv.org/abs/2208.08022

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