Structural-Phase Сhanges During the D1a→A1 Phase Transition in the Ni4Mo Alloy

УДК 621.317.373

  • A.A. Klopotov Tomsk State University of Architecture and Building (Tomsk, Russia) Email: klopotovaa@tsuab.ru
  • Yu.A. Abzaev Tomsk State University of Architecture and Building (Tomsk, Russia) Email: abzaev2010@yandex.ru
  • L.I. Trishkina Tomsk State University of Architecture and Building (Tomsk, Russia) Email: trishkina.53@mail.ru
  • T.V. Cherkasova Tomsk State University of Architecture and Building (Tomsk, Russia) Email: cherkasova_tv@mail.tu
  • A.I. Potekaev National Research Tomsk State University (Tomsk, Russia) Email: potekaev@spti.tsu.ru
DOI_disc_logo https://doi.org/10.14258/izvasu(2022)1-05
Keywords: alloys Ni4Mo, superstructure D1a, order-disor-der phase transition, heat capacity

Abstract

The results of studying the structural and thermal effects in the region of the D1a→A1 order-disorder phase transition in the Ni4Mo alloy are presented. It is found that the D1a→A1 transition occurs in a narrow temperature range of 16 °C while the long-range order parameter п in this range decreases from 1 to 0.85 and, upon reaching ТК, decreases abruptly to 0. Studying the thermal effects allows obtaining the temperature dependence of the specific heat Ср(Т) is obtained and determination of the enthalpy and entropy of the D1a→A1 order-disorder phase transition in the Ni4Mo alloy. It is found that the main contribution to the entropy of transformation is configurational. The nonconfiguration contribution is not large and contributes to the ordering processes. It is established that the beginning of the deviation on the temperature dependence of Cp(T) from the linear one correlates with the beginning of the formation of the two-phase state D1a +A1 and the beginning of a decrease in the atomic long-range order in the D1a. Based on calculations based on the first a principles of thermodynamic parameters of compounds, the enthalpy of formation in the Ni-Mo system is obtained. It is found that the most stable compound in this system is Ni3Mo. Theoretical calculations of the compound formation enthalpy give a value of -8.3 kJ/mol.

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Author Biographies

A.A. Klopotov, Tomsk State University of Architecture and Building (Tomsk, Russia)

доктор физико-математических наук, профессор, профессор кафедры прикладной механики и материаловедения

Yu.A. Abzaev, Tomsk State University of Architecture and Building (Tomsk, Russia)

доктор физико-математических наук, профессор, профессор кафедры высшей математики

L.I. Trishkina, Tomsk State University of Architecture and Building (Tomsk, Russia)

доктор физико-математических наук, доцент, профессор кафедры физики, химии и теоретической механики

T.V. Cherkasova, Tomsk State University of Architecture and Building (Tomsk, Russia)

доктор физико-математических наук, доцент, доцент кафедры физики, химии и теоретической механики

A.I. Potekaev, National Research Tomsk State University (Tomsk, Russia)

доктор физико-математических наук, профессор, профессор кафедры общей и экспериментальной физики

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Published
2022-03-18
How to Cite
Klopotov A., Abzaev Y., Trishkina L., Cherkasova T., Potekaev A. Structural-Phase Сhanges During the D1a→A1 Phase Transition in the Ni4Mo Alloy // Izvestiya of Altai State University, 2022, № 1(123). P. 36-43 DOI: 10.14258/izvasu(2022)1-05. URL: http://izvestiya.asu.ru/article/view/%282022%291-05.
Issue
No 1(123) (2022): Известия Алтайского государственного университета
Section
Физика

Copyright (c) 2022 Анатолий Анатольевич Клопотов, Юрий Афанасьевич Абзаев, Людмила Ильинична Тришкина, Татьяна Владимировна Черкасова, Александр Иванович Потекаев

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