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第六届材料与热加工物理模拟及数值模拟国际会议

作者： Igor P.mazur sergey m.bel’skii Rolling Department Lipetsk State Technical University

ISBN: (纸本)9783037853061

In the gaps between cells within continuous groups of rolling mills,as a result of local temperature and mechanical factors,longitudinal elastic stress may arise in the strip;this stress is the sum of uniform and self-balancing *** components affect metal flow in the deformation *** to the St Venant principle,the influence of the self-balancing component declines with increasing distance from the point of *** longitudinal and transversal distribution of the self-balancing elastic stress in the strip was analyzed as well as the maximum distance between the deformation source and the point of elastic stress in the strip at which the self-balancing component still affects the plastic deformation of the metal,i.e.,the extent of the influence zone of the self-balancing *** results of this analysis will be useful for a design of new flatness control methods and devices.

关键词： continuous rolling St Venant zone self-balancing elastic stress distribution of elastic stress flatness control.

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Dynamics of antipolar distortions

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npj Computational materials 2017年第1期3卷 171-178页

作者： Kinnary Patel sergey Prosandeev Laurent bellaiche Physics Department and Institute for Nanoscience and Engineering University of ArkansasFayettevilleAR 72701USA Institute of Physics and Physics Department of Southern Federal University Rostov-na-Donu 344090Russia

materials possessing antipolar cation motions are currently receiving a lot of attention because they are fundamentally intriguing while being technologically *** studies devoted to these complex materials have focused on their static properties or on their zone-center *** a result,some important dynamics of antipolar cation distortions,such as the temperature behavior of their phonon frequencies,have been much less investigated,despite the possibility to exhibit unusual ***,we report the results and analysis of atomistic simulations revealing and explaining such dynamics for BiFeO3 bulks being subject to hydrostatic *** is first predicted that cooling such material yields the following phase transition sequence:the cubic paraelectric Pm3m state at high temperature,followed by an intermediate phase possessing long-range-ordered in-phase oxygen octahedral tiltings,and then the Pnma state that is known to possess antipolar cation motions in addition to in-phase and antiphase oxygen octahedral *** cation modes are found to all have high phonon frequencies that are independent of temperature in the paraelectric *** the other hand and in addition to antipolar cation modes increasing in number,some phonons possessing antipolar cation character are rather soft in the intermediate and Pnma *** of our data combined with the development of a simple model reveals that such features originate from a dynamical mixing between pure antipolar cation phonons and fluctuations of oxygen octahedral tiltings,as a result of a specific trilinear energetic *** developed model can also be easily applied to predict dynamics of antipolar cation motions for other possible structural paths bringing Pm3m to Pnma states.

关键词： polar distortion phonon

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