Vladimir State University named after Alexander and Nikolay Stoletovs, Vladimir, Russia

E. S. Prusov, Associate Professor at the Department of Functional and Structural Materials Engineering, Candidate of Technical Sciences, Associate Professor

A. V. Aborkin, Lecturer at the Department of Mechanical Engineering, Candidate of Technical Sciences, Associate Professor

Vladimir State University named after Alexander and Nikolay Stoletovs, Vladimir, Russia¹ ; Wuhan Textile University, Wuhan, China² ; National University of Science and Technology MISIS, Moscow, Russia³

V. B. Deev, Principal Researcher¹, Professor at the Faculty of Mechanical Engineering and Automation², Professor at the Department of Metal Forming³, Doctor of Technical Sciences, Professor, (Corresponding Author), e-mail: deev.vb@mail.ru

This paper aims to identify possible changes in the nature of interfacial interactions at different remelt stages in order to clarify the mechanisms of metal lurgical processes during recycling of cast Al – Si – B₄C-base composites. The method of differential scanning calorimetry (DSC) was used to examine the interfacial reactions between the components of the cast composites. Pilot measurements showed that the presence of undivided thermal effects with similar temperature characteristics is limiting their distinguishability in such a general representation. To increase the level of detail, the results were presented as fragments of DSC curves in temperature intervals corresponding to the thermal effects identified on the full DSC curve. In some cases, when weak thermal effects observed only during cooling could not be identified even by scaling, additional firs t - order derivative curves of the heating curve (dDSC) were built, which are a function of the changing temperature rate. The analysis of DSC curves helped determine the characteristic temperatures, as well as the heat released or absorbed for the melting-crystallization of cast composite materials AK12och + 10 vol.% B4C at different stages of repeated remelts during controlled heating or cooling.

This research was funded by the Russian Science Foundation (Project № 21-79-10432, https://rscf.ru/project/21-79-10432/). The work was performed using the equipment of the Joint Research Centre at the Institute of General and Inorganic Chemistry of the Russian Academy of Sciences. The authors would like to thoroughly thank A.V. Khoroshilov, PhD (Chemistry), for his comprehensive support in conducting the differential scanning calorimetry study.

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