The structure and properties of boron carbide ceramics modified by high-current pulsed electron-beam; AIP Conference Proceedings; Vol. 1698 : Advanced Materials in Technology and Construction, AMTC-2015

Bibliographic Details
Parent link:	AIP Conference Proceedings Vol. 1698 : Advanced Materials in Technology and Construction, AMTC-2015.— 2016.— [030008, 9 p.]
Corporate Author:	Национальный исследовательский Томский политехнический университет
Other Authors:	Ivanov Yu. F. Yuriy Fedorovich, Tolkachev O. S. Oleg Sergeevich, Petyukevich M. S. Mariya Stanislavovna, Teresov A. D. Anton Dmitrievich, Ivanova O. V. Olga Viktorovna, Ikonnikova I. A. Irina Aleksandrovna, Polisadova V. V. Valentina Valentinovna
Summary:	Title screen The present work is devoted to numerical simulation of temperature fields and the analysis of structural and strength properties of the samples surface layer of boron carbide ceramics treated by the high-current pulsed electron-beam of the submillisecond duration. The samples made of sintered boron carbide ceramics are used in these investigations. The problem of calculating the temperature field is reduced to solving the thermal conductivity equation. The electron beam density ranges between 8…30 J/cm2, while the pulse durations are 100…200 μs in numerical modelling. The results of modelling the temperature field allowed ascertaining the threshold parameters of the electron beam, such as energy density and pulse duration. The electron beam irradiation is accompanied by the structural modification of the surfacelayer of boron carbide ceramics either in the single-phase (liquid or solid) or two-phase (solid-liquid) states. The sample surface of boron carbide ceramics is treated under the two-phase state (solid-liquid) conditions of the structural modification. The surface layer is modified by the high-current pulsed electron-beam produced by SOLO installation at the Institute of High Current Electronics of the Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia. The elemental composition and the defect structure of the modified surface layer are analyzed by the optical instrument, scanning electron and transmission electron microscopes. Mechanical properties of the modified layer are determined measuring its hardnessand crack resistance. Research results show that the melting and subsequent rapid solidification of thesurface layer lead to such phenomena as fragmentation due to a crack network, grain size reduction, formation of the sub-grained structure due to mechanical twinning, and increase of hardness and crack resistance. Режим доступа: по договору с организацией-держателем ресурса
Language:	English
Published:	2016
Subjects:	электронный ресурс труды учёных ТПУ
Online Access:	http://dx.doi.org/10.1063/1.4937830
Format:	Electronic Book Chapter
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=647499