IN SITU STUDY OF PHASE FORMATION DYNAMICS IN Ti–Al–C POWDER MIXTURE, ACTIVATED BY MECHANO-RADIATION METHOD
BTRSIW
DOI:
https://doi.org/10.25712/ASTU.2072-8921.2025.04.043Keywords:
MAX-phases, mechanical and radiation activation, high-temperature synthesis, thermal explosion, synchrotron radiation, phase composition, phase formation, structure formationAbstract
In situ synchrotron studies of the dynamics of structure formation in a mixture of Ti + Al + C after mech-ano-radiation activation during high-temperature synthesis by thermal explosion using induction heating were carried out. Mechano-radiation activation is a series of mechanical activation operations in the AGO-2 activator (7 min. at an energy intensity of 40 g) and irradiation with gamma rays of 60Co at the installation «Explorer» of formed mechanocom-posites (accumulated dose of 50 kGy). The main purpose of such stimulation is the formation of products of self–propagating high-temperature synthesis of the desired structural and phase composition. Research on the dynamics of synthesis processes in real time was conducted in the laboratory "Methods of Synchrotron Radiation" of the Budker Insti-tute of Nuclear Physics SB RAS. The range of scanning angles was 33°...66°. The duration of accumulation of each frame during the experiment was 0.5 seconds. As a result of in situ experiments, the stages of formation and the tem-perature-time interval of formation of compounds and MAX phases in the Ti–Al–C ternary system were determined. Phase formation begins with the formation of TiAl3, then an Al–Ti melt is formed with the release of TiC grains, then the titanium-aluminum melt is saturated with carbon with the crystallization of Ti2AlC, and Ti3AlC2 is formed at the final stage. When cooled to room temperature, the synthesis product in the Ti-Al-C system is dominated by Ti2AlC (47 %), the Ti3AlC2 content is 36%, and titanium carbide TiC is fixed at about 17 %.
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Copyright (c) 2025 Alexander A. Sitnikov, Alexey V. Sobachkin, Marina V. Loginova, Vladimir I. Yakovlev, Valery Yu. Filimonov, Andrey Yu. Myasnikov, Alexander V. Gradoboev, Marat R. Sharafutdinov, Boris P. Tolochko
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