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Application of high-temperature electron microscopy to the study of thermal processes

DOI 10.18127/j19998465-201907-03


A.V. Vasyashin - Senior Lecturer, National Research Nuclear University MEPHI, Obninsk Institute of Nuclear Power Engineering
N.Ya. Roukhlyada - Dr.Sc. (Phys.-Math.), Professor, Associate Professor, National Research Nuclear University MEPHI, Obninsk Institute of Nuclear Power Engineering
D.S. Trofimov - General Director, JSC «Scientific and Production Enterprise «Thorium» (Moscow); Academician of the Academy of Quality Problems of the Russian Federation

Formulation of the problem. In a number of devices that generate microwave electromagnetic waves (MEW), some structural materials operate at high temperatures, causing phase transitions such as a solid body - a solid body. At the same time, such characteristics of a solid body as linear dimensions, strength, creep, etc. change abruptly. All this can lead to a change in the parameters of the device, its failure, a decrease in service life. Therefore, the study of phase transformations of solids is relevant. As shown in this paper, a very effective tool is an electron emission microscope (EEM) used to experimentally determine the fundamental characteristic of a solid body — the latent heat of phase transformation. The purpose of the work is the experimental determination of the latent heat of phase transformation in ruthenium
Results. With the help of an EEM, the kinetics of phase transformation in a ruthenium sample was studied. As a result of the analysis of the video image in the electron microscope of the phase transition, the average velocity of the interface is determined. An estimate of the latent heat of phase transformation was made.
Practical value. Designers of radio engineering devices try to avoid the use of materials experiencing phase transformations. It is known that upon receipt of alloys, alloying additives experiencing phase transformations can “induce” phase transformations in the whole alloy. The presence of phase transformation can be observed in the microscope and, thus, to exclude its use in the design.

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May 29, 2020

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