blackmetИзвестия высших учебных заведений. Черная МеталлургияIzvestiya. Ferrous Metallurgy0368-07972410-2091National University of Science and Technology "MISIS"10.17073/0368-0797-2024-5-556-562blackmet-2789Research ArticleМАТЕРИАЛОВЕДЕНИЕMATERIAL SCIENCEДеформация и разрушение термически обработанных лент аморфного сплава системы Co – Fe – Cr – Si – B при индентированииDeformation and fracture of heat treated ribbon of amorphous Co – Fe – Cr – Si – B alloy during indentationhttps://orcid.org/0000-0002-1163-3888ПермяковаИ. Е.PermyakovaI. E.

Инга Евгеньевна Пермякова, д.ф.-м.н., ведущий научный сотрудник лаборатории физикохимии и механики металлических материалов

Россия, 119334, Москва, Ленинский пр., д. 49

Inga E. Permyakova, Dr. Sci. (Phys.-Math.), Senior Researcher of the Laboratory “Physicochemistry and Mechanics of Metallic Materials”

49 Leninskii Ave., Moscow 119334, Russian Federation

inga_perm@mail.ruhttps://orcid.org/0000-0002-2136-5792КостинаМ. В.KostinaM. V.

Мария Владимировна Костина, д.т.н., доцент, ведущий научный сотрудник, заведующий лабораторией физикохимии и механики металлических материалов

Россия, 119334, Москва, Ленинский пр., д. 49

Mariya V. Kostina, Dr. Sci. (Eng.), Assist. Prof., Senior Researcher, Head of the Laboratory “Physicochemistry and Mechanics of Metallic Materials”

49 Leninskii Ave., Moscow 119334, Russian Federation

mvkst@yandex.ruИнститут металлургии и материаловедения им. А.А. Байкова РАНРоссияBaikov Institute of Metallurgy and Materials Science, Russian Academy of SciencesRussian Federation202420102024675556562Copyright © Пермякова И.Е., Костина М.В., 20242024Пермякова И.Е., Костина М.В.Permyakova I.E., Kostina M.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://fermet.misis.ru/jour/article/view/2789

Индентирование является привлекательным методом для изучения деформационного поведения аморфных сплавов по ряду причин: не будучи специфичными к размеру образца, эти испытания просты в выполнении и не приводят к макроразрушению; пластичес­кая деформация в материале ограничена локально, что облегчает изучение пластического течения в зонах окружающих и находящихся под индентором; прямое сравнение результатов индентирования с откликами, например, на изгиб или растяжение дополнительно делает метод индентирования эффективным «зондом» для понимания физики пластической деформации и разрушения аморфных сплавов. В настоящей работе представлены результаты исследований морфологии микроотпечатков после индентирования на эластичной подложке лент быстрозакаленных аморфных сплавов Co70,5Fe0,5Сr4Si7B18 , подвергнутых термической обработке в широком диапазоне температур. Структурно-фазовые превращения контролировались проведением рентгеноструктурного анализа и дифференциально-сканирующей калориметрией. Обнаружены характерные видоизменения картин их деформации и разрушения при переходе из аморфного в кристаллическое состояние. Установлены три температурных интервала с характерными зонами деформирования на поверхности исследуемых образцов. При Tкомн < Tf  аморфный сплав демонстрируют уникальную пластичность, при максимальной нагрузке на индентор появляются только полосы сдвига вокруг отпечатка. Интервал Tf  ≤ Tan ≤ Tsb – переходный, так как при более низких температурах не образуются трещины, а при более высоких нет полос сдвига. Сплав находится в аморфном, но охрупченном состоянии, поэтому наблюдаются радиальные и кольцевые трещины, а также отколы. Интервал Tsb < Tan ≤ Tcrys соответствует окончательной трансформации сплава в кристаллическое состояние, формируются симметричные картины разрушения, состоящие из квадратных сеток трещин. Таким образом, на основании составленного с учетом соответствующих температурных интервалов «атласа» зон локального нагружения (наличие/отсутствие полос сдвига, трещин, их взаимное расположение) при разных нагрузках возможно дать приближенную экспресс-оценку структурного состояния аморфных сплавов.

Indentation is an attractive method for studying the deformation behavior of amorphous alloys for a number of reasons: not being specific to the sample size, these tests are easy to perform and do not lead to macrofracture; plastic deformation in the material is locally limited, which facilitates the study of plastic flow in the zones surrounding and located under the indenter; direct comparison of indentation results with responses, for example, to bending or tension further makes the indentation method an effective “probe” for understanding the physics of plastic deformation and fracture of amorphous alloys. The morphology of microprints of melt-quenched ribbon of Co70.5Fe0.5Сr4Si7B18 amorphous alloys subjected to heat treatment in a wide range of temperatures was studied after indentation on an elastic substrate. Structural-phase transformations were controlled by X-ray structural analysis and differential scanning calorimetry. We discovered characteristic modifications in the patterns of their deformation and fracture during the transition from amorphous to crystalline state. Three temperature ranges with characteristic deformation zones on the surface of the studied samples were established. At Troom < Tf  , amorphous alloy demonstrates unique plasticity. The shear bands appear around the imprint only at the maximum load on the indenter. Tf  ≤ Tan ≤ Tsb is a transitional interval, since cracks do not form at lower temperatures, and there are no shear bands at higher temperatures. The alloy is in an amorphous but brittle state, so radial and ring cracks, as well as spalls, are observed. The interval Tsb < Tan ≤ Tcrys corresponds to the final transformation of the alloy into a crystalline state; symmetrical patterns of fracture are formed, consisting of square crack networks. It is possible to give an approximate express assessment of the structural state of amorphous alloys based on an “atlas” of local loading zones (presence/absence of shear bands, cracks, their relative position) compiled taking into account the corresponding temperature intervals under different loads.

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