Zobrazeno 1 - 10
of 504
pro vyhledávání: '"Levitas, Valery I."'
Autor:
Levitas, Valery I., Pratoori, Raghunandan, Popov, Dmitry, Park, Changyong, Velisavljevic, Nenad
Significant grain growth is observed during the high-pressure phase transformations (PTs) at room temperature within an hour for various materials. However, no existing theory explains this phenomenon since nanocrystals do not grow at room temperatur
Externí odkaz:
http://arxiv.org/abs/2406.09461
Autor:
Dhar, Achyut, Levitas, Valery I., Pandey, K. K., Park, Changyong, Somayazulu, Maddury, Velisavljevic, Nenad
Plastic strain-induced phase transformations (PTs) and chemical reactions under high pressure are broadly spread in modern technologies, friction and wear, geophysics, and astrogeology. However, because of very heterogeneous fields of plastic strain
Externí odkaz:
http://arxiv.org/abs/2405.14807
Autor:
Chen, Hao, Levitas, Valery I.
Virtual melting (VM) as alternative deformation and stress relaxation mechanisms under extreme load is directly validated by molecular dynamics (MD) simulations of the simple shear of single crystal Si I at a temperature 1,383 K below the melting tem
Externí odkaz:
http://arxiv.org/abs/2405.09105
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
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
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
Scale-free phase-field approach (PFA) at large strains and corresponding finite element method (FEM) simulations for multivariant martensitic phase transformation (PT) from cubic Si I to tetragonal Si II in a polycrystalline aggregate are presented.
Externí odkaz:
http://arxiv.org/abs/2302.05952
The first study of the effect of the initial microstructure on its evolution under hydrostatic compression before, during, and after the irreversible $\alpha\rightarrow\omega$ phase transformation and during pressure release in Zr using in situ x-ray
Externí odkaz:
http://arxiv.org/abs/2301.10475
Publikováno v:
Journal of Applied Physics; 9/21/2024, Vol. 136 Issue 11, p1-20, 20p
Autor:
Peng, Yipeng, Ji, Rigelesaiyin, Phan, Thanh, Capolungo, Laurent, Levitas, Valery I., Xiong, Liming
In this paper, we perform concurrent atomistic-continuum (CAC) simulations to (i) characterize the internal stress induced by the microscale dislocation pileup at an atomically structured interface; (ii) decompose this stress into two parts, one of w
Externí odkaz:
http://arxiv.org/abs/2208.03592