powderИзвестия вузов. Порошковая металлургия и функциональные покрытияPowder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya)1997-308X2412-8767НИТУ "МИСИС"10.17073/1997-308X-2023-1-28-38powder-765Research ArticleСамораспространяющийся высокотемпературный синтезSelf-Propagating High-Temperature Synthesis (SHS)Формирование продуктов при воспламенении, горении и плавлении смесей высокоэнтропийного сплава FeNiCoCrCu с титаном и углеродомFormation of products upon ignition, combustion and melting of mixtures of high-entropy alloy FeNiCoCrCu with titanium and carbonhttps://orcid.org/0000-0002-2360-2114ВадченкоС. Г.VadchenkoS. G.

Сергей Георгиевич Вадченко - кандидат физико-математических наук, ведущий научный сотрудник лаборатории динамики микрогетерогенных процессов.

142432, Московская обл., Черноголовка, ул. Академика Осипьяна, 8

Sergei G. Vadchenko - Cand. Sci. (Phys.-Math.), Leading Researcher, Laboratory of dynamics of microheterogeneous processes.

8 Akademican Osip'yan Str., Chernogolovka, Moscow region 142432

vadchenko@ism.ac.ruhttps://orcid.org/0000-0002-9805-2575ВергуноваЮ. С.VergunovaYu. S.

Юлия Сергеевна Вергунова - аспирант лаборатории динамики микрогетерогенных процессов, ИСМАН.

142432, Московская обл., Черноголовка, ул. Академика Осипьяна, 8

Yulia S. Vergunova - Postgraduate Student, Laboratory of dynamics of microheterogeneous processes of ISMAN.

8 Akademican Osip'yan Str., Chernogolovka, Moscow region 142432

yulya-ser94@yandex.ruhttps://orcid.org/0000-0003-1554-0803РогачевА. С.RogachevA. S.

Александр Сергеевич Рогачев - доктор физико-математических наук, проф., заведующий лабораторией динамики микрогетерогенных процессов, ИСМАН.

142432, Московская обл., Черноголовка, ул. Академика Осипьяна, 8

Aleksander S. Rogachev - Dr. Sci. (Phys.-Math.), Prof., Head of the Laboratory of dynamics of microheterogeneous processes of ISMAN.

8 Akademican Osip'yan Str., Chernogolovka, Moscow region 142432

rogachev@ism.ac.ruhttps://orcid.org/0000-0003-4710-837XКовалевИ. Д.KovalevI. D.

Иван Дмитриевич Ковалев - кандидат физико-математических наук, старший научный сотрудник лаборатории рентгеноструктурных исследований, ИСМАН.

142432, Московская обл., Черноголовка, ул. Академика Осипьяна, 8

Ivan D. Kovalev - Cand. Sci. (Phys.-Math.), Senior Researcher, Laboratory of A-ray investigation of ISMAN.

8 Akademican Osip'yan Str., Chernogolovka, Moscow region 142432

i2212@yandex.ruhttps://orcid.org/0000-0002-5089-0908МухинаН. И.MukhinaN. I.

Нина Илларионовна Мухина - технолог лаборатории физического материаловедения, ИСМАН.

142432, Московская обл., Черноголовка, ул. Академика Осипьяна, 8

Nina I. Mukhina - Technologist, Laboratory of materials science of ISMAN.

8 Akademican Osip'yan Str., Chernogolovka, Moscow region 142432

muxinanina2012@yandex.ruИнститут структурной макрокинетики и проблем материаловедения им. А.Г. Мержанова, РАНРоссияМerzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of SciencesRussian Federation2023140320231712838Copyright © НИТУ "МИСИС", 20232023НИТУ "МИСИС"НИТУ "МИСИС"https://powder.misis.ru/jour/about/submissions#copyrightNoticehttps://powder.misis.ru/jour/article/view/765

Исследована зависимость температуры воспламенения, скорости горения и состава формирующихся продуктов от концентрации Ti + C в смесях с порошком высокоэнтропийного сплава (ВЭС) FeNiCoCrCu и исходной смесью образующих его металлов (MIX). ВЭС получали методом механической активации (МА) смеси порошков металлов в среде аргона. При температуре плавления высокоэнтропийный сплав FeNiCoCrCu распадается на несколько фаз, но основу этого ВЭС, а также сплава, полученного при плавлении и кристаллизации MIX, составляет 5-компонентная фаза с усредненной формулой Cu1,2Fe1,4Ni1,4Co1,4Cr. Кроме того, в небольших количествах в связке присутствуют 5-, 4- и 3-компонентные фазы с усредненными формулами Cu2Ni2Co2Fe2Cr, Cu3Ni3Co2,9Fe2,5Cr, Cu4,8Ni4,5Co4,6Fe4,2Cr, Cu40Fe2Ni4Co2C, Cr12,5Fe3,2Co2,6Ni и Co3,2Fe3,5Cr. Эксперименты по воспламенению и горению смесей MIX и ВЭС с Ti + C проводили в аргоне при атмосферном давлении. Скорость горения, температура воспламенения и максимальная температура, достигаемая при тепловом взрыве смесей MIX и ВЭС с Ti + C, растут с увеличением концентрации Ti + C. Из-за малой экзотермичности смесей эксперименты проводили при начальной температуре 500 °С - в этом случае предел горения образцов наступает при концентрации Ti + C в смесях ВЭС и MIX <30 %. По результатам сканирующей электронной микроскопии рассчитана объемная концентрация частиц карбида титана (TiC) в расплавленных образцах. В сплаве со связкой из ВЭС количество частиц TiC в единице объема в 1,5-3,0 раза больше, чем в сплаве со связкой из MIX, а их размер соответственно меньше. С повышением концентрации Ti + C от 30 до 40 % в смеси с ВЭС количество числа частиц TiC в единице объема уменьшается. В смеси с MIX объемная концентрация частиц TiC проходит через минимум. Это связано с двумя противоположными процессами -с одной стороны, увеличивается вероятность зарождения частиц TiC, а с другой - происходит их коагуляция.

The dependence of the ignition temperature, combustion rate and composition of the resulting products on the concentration of Ti + C in mixtures with powder of a high-entropy alloy (HEA) FeNiCoCrCu and the initial mixture of metals forming it (MIX) has been studied. HEA was obtained by mechanical activation (MA) of a mixture of metal powders in argon. At the melting temperature, the high-entropy FeNiCoCrCu alloy decomposes into several phases, but the basis of the HEA alloy, as well as the alloy obtained by melting and crystallizing MIX, is a 5-component phase with an average formula Cu1.2Fe1.4Ni1.4Co1.4Cr. In addition, 5, 4, and 3-component phases with averaged formulas Cu2Ni2Co2Fe2Cr, Cu3Ni3Co2.9Fe2.5Cr, Cu4.8Ni4.5Co4.6Fe4.2Cr, Cu40Fe2Ni4Co2C, Cr12.5Fe3.2Co2.6Ni and Co3.2 Fe3,5 Cr are present in small amounts in the binder. Experiments on the ignition and combustion of mixtures of MIX and HEA with Ti + C were carried out in argon at atmospheric pressure. The combustion rate, ignition temperature, and maximum temperature reached in the thermal explosion of MIX and HEA mixtures with Ti + C increase with increasing Ti + C concentration. Due to the low exothermicity of the mixtures, the experiments were carried out at an initial temperature of 500 °С. At this initial temperature, the combustion limit of the samples occurs when the Ti + C concentration in the HEA and MIX mixtures is less than 30 %. Based on the results of scanning electron microscopy, the volume concentration of the number of titanium carbide (TiC) particles in molten samples was calculated. In an alloy with a HEA binder, the number of TiC particles per unit volume is 1.5-3.0 times greater than in an alloy with a MIX binder, and their size is correspondingly smaller. With an increase in the concentration of Ti + C from 30 to 40 % in a mixture with HEA, the number of TiC particles per unit volume decreases. In a mixture with MIX, the number of TiC particles per unit volume passes through a minimum. This is due to two opposite processes: on the one hand, the probability of the generation of TiC particles increases, on the other hand, their coagulation occurs.

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The authors declare that there are no conflicts of interest present.