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The Investigation of Melting-Crystallization Processes of Alloys in Se-S System

S. A. FrolovaFSBEI HE «Donbas National Academy of Civil Engineering and Architecture»O. V. SobolFSBEI HE «Donbas National Academy of Civil Engineering and Architecture»Ye. A. PokintelicaFSBEI HE «Donbas National Academy of Civil Engineering and Architecture»V. M. LoshakovaFSBEI HE «Donbas National Academy of Civil Engineering and Architecture»O. V. JharikovaFSBEI HE «Donbas National Academy of Civil Engineering and Architecture»
Abstract: The processes of melting and crystallization of samples in the sulfur-selenium system were investigated by cyclic-thermal analysis (CTA). When studying pure sulfur and alloy S + 10,2% Se, it was found that sulfur and alloys rich in sulfur behave like crystalline substances during crystallization, that is, both equilibrium crystallization (EC) and non-equilibrium-explosive (NEC) occur. During crystallization of the NEC type, three types of hypothermia were recorded: physical, visible and fictitious. Graphs of overcooling values dependence on cooling rate and overcooled melt holding time are given. During crystallization, it was also found that selenium and alloys rich in selenium behave like viscous glass-like substances – crystallization occurs very slowly, the thermal effects of which are practically not recorded during cooling. It is possible to fix the amount of crystallized substance only during melting by conducting thermal-time treatment of the overcooled melt. For selenium and alloys rich in selenium, a method is proposed for determining the degree of crystallinity by endothermic melting effects after isothermal exposure of the melt in the overcooling region.

Keywords: thermal analysis, sulfur, selenium, alloys, state diagram crystallization, hypothermia, degree of crystallinity.

Pages: 123-133.

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For citation: Frolova, S. A.; Sobol, O. V.; Pokintelica, Ye. A. [et al.]. The Investigation of Melting-Crystallization Processes of Alloys in Se-S System. – Text : electronic. – In: <em>Proceeding of the Donbas National Academy of Civil Engineering and Architecture</em>. – 2024. – Issue 2024-1(165) Modern building materials. – Р. 123-133. – URL: https://donnasa.ru/publish_house/journals/vestnik/2024/2024-1(165)/st_18_frolova_sobol_pokintelica_loshakova_zharikova.pdf (date of access: 22.12.2024). – ISSN 2519-2817.

Issue 2024-1 (165)
Journal: Proceeding of the Donbas National Academy of Civil Engineering and Architecture
Publish house: Donbas National Academy of Civil Engineering and Architecture