Frontier Materials & TechnologiesFrontier Materials & TechnologiesFrontier Materials & Technologies2782-40392782-6074Togliatti State University80610.18323/2782-4039-2022-4-30-37ArticlesСтатьиThe investigation of the slippage effect, transformation of the structure and properties of the Zr–1%Nb alloy during high-pressure torsion deformationИсследование эффекта проскальзывания, трансформации структуры и свойств сплава Zr–1%Nb при интенсивной пластической деформации кручениемhttps://orcid.org/0000-0001-5925-4513GunderovDmitry V.ГундеровДмитрий Валерьевич
Russian Federation

Doctor of Sciences (Physics and Mathematics), Professor, leading researcher

доктор физико-математических наук, профессор, ведущий научный сотрудник

dimagun@mail.ruStotskyAndrey G.СтоцкийАндрей Геннадиевич
Russian Federation

junior researcher

младший научный сотрудник

stockii_andrei@mail.ruhttps://orcid.org/0000-0002-8483-6408AubakirovaVeta R.АубакироваВета Робертовна
Russian Federation

PhD (Engineering)

кандидат технических наук

veta_mr@mail.ruGunderovaSofia D.ГундероваСофья Дмитриевна
Russian Federation

student

студент

gynderova@mail.ruhttps://orcid.org/0000-0002-5873-8046LebedevYuriy A.ЛебедевЮрий Анатольевич
Russian Federation

PhD (Physics and Mathematics), senior researcher

кандидат физико-математических наук, старший научный сотрудник

lebedev@anrb.ruUfa University of Science and Technology, UfaУфимский университет науки и технологий, УфаInstitute of Physics of Molecules and Crystals of Ufa Federal Research Center of the Russian Academy of Sciences, UfaИнститут физики молекул и кристаллов Уфимского федерального исследовательского центра Российской академии наук, Уфа301220224303730122022https://vektornaukitech.ru/jour/article/view/806

High-pressure torsion deformation (HPT) is an effective method for transforming the structure of metallic materials, forming a nanostructural state in them, and significantly improving their strength. However, deformation achieved during HPT can be much less than expected due to the slippage. The study of the slippage effect during HPT of various materials is a topical issue. Previously, the authors proposed a simple and illustrative method for assessing slippage and the actual degree of torsion deformation achieved during HPT. Zr–1%Nb alloys, on which many studies of the HPT effect previously have been carried out, are good material for studying the slippage effect during HPT. Therefore, it is possible to compare obtained data with the results of other authors. The paper investigates the HPT impact on the structure and properties of the Zr–1%Nb alloy and demonstrates the slippage effect. The initial disk, prepared for HPT, was cut into two half-disks that were jointly placed on the strikers and exposed to joint HPT for n=¼ revolutions of anvils. The authors evaluated the slippage effect from the view of halves. The study showed that even at the initial HPT stages at n=¼ revolutions, there is a significant slippage of strikers and a sample, and the torsion deformation does not accumulate as expected. The authors analyzed the influence of various HPT modes on the microhardness, structure, and phase composition of the Zr–1%Nb alloy. The study shows that, despite the slippage effect, the Zr–1%Nb alloy is strongly hardened during HPT for one revolution (n=1) and HPT with n=10; the microhardness and tensile strength increase significantly, and up to 90 % of high-pressure ω-phases is formed in the sample. The authors conclude that during HPT, the deformation is implemented not by simple torsion but by the more complex modes.

Интенсивная пластическая деформация кручением (ИПДК) является эффективным способом трансформации структуры металлических материалов, формирования в них наноструктурного состояния, значительного повышения прочности. Однако реально достигаемая при ИПДК деформация может быть значительно меньше ожидаемой в связи с проскальзыванием. Исследование эффекта проскальзывания при ИПДК различных материалов является актуальным вопросом. Ранее авторами был предложен простой и наглядный способ оценки проскальзывания и реально достигаемой степени деформации кручением. Интересным материалом для исследования эффекта проскальзывания при ИПДК являются сплавы Zr–1%Nb, на которых ранее был проведен ряд исследований по изучению воздействия ИПДК. Таким образом, возможно сравнивать полученные данные с результатами других авторов. В статье исследовано воздействие ИПДК на структуру и свойства сплава Zr–1%Nb, а также продемонстрирован эффект проскальзывания. Подготовленный для ИПДК исходный диск разрезался на два полудиска, которые совместно помещались на бойки и подвергались совместной ИПДК на n=¼ оборота наковален. Эффект проскальзывания оценивался по виду половинок. Показано, что уже на начальных этапах ИПДК на n=¼ оборота происходит значительное проскальзывание бойков и образца, а деформация кручением не накапливается согласно ожиданиям. Проанализировано влияние различных режимов ИПДК на микротвердость, структуру, фазовый состав сплава Zr–1%Nb. Показано, что, несмотря на эффект проскальзывания, сплав Zr–1%Nb сильно упрочняется при ИПДК на один оборот (n=1) и ИПДК с n=10; микротвердость и предел прочности при этом значительно увеличиваются, в образце формируется до 90 % ω-фазы высокого давления. Делается вывод, что при ИПДК деформация осуществляется не простым кручением, а более сложными модами.

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