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THERMOPHYSICAL PROPERTIES OF DOPED RARE-EARTH METAL ALLOY ZN55AL

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UDC: 538.9         https://doi.org/10.62965/tnu.sns.2024.1.10

Sharipov J., Nizomov Z., Saidzoda R.

Tajik National University

 

The paper presents the results of a study of the thermophysical properties of Zn55Al alloy doped with scandium, yttrium, cerium, praseodymium, neodymium and europium in a wide temperature range. It was established that in all studied samples anomalous cooling associated with a first-order phase transition is observed. It is assumed that the two observed cooling processes of the alloy are associated with radiative and convective heat transfer.

It was revealed that the radiation process ends quickly and the sample is subsequently cooled only due to convective heat exchange with the environment. Using data on the temperature dependence of the heat capacity of aluminum and zinc, the temperature dependences of the heat capacity of the Zn55Al alloy and its heat transfer coefficient were calculated using the Neumann- Kopp rule . The results obtained show that the temperature dependence of the heat capacity is described by the polynomial С(Т)=a + b T + c T2 + d T3. It has been shown that the heat capacity of alloyed alloys is less than that of the original alloy and increases with increasing temperature, and changes differently with increasing concentration of the alloyed metal. For Zn55Al alloys alloyed with europium, cerium and neodymium, the heat capacity decreases with increasing concentration, and for alloys alloyed with praseodymium and scandium it increases. The phase transition process is observed in the Zn55Al alloy and becomes more pronounced upon alloying, which is explained by the process of monotectoid transformation α1→α2+β at a temperature of 529 K. It is shown that the results obtained are consistent with the zinc-aluminum phase diagram.

 

Key words: alloy, cooling, rare earth metals, alloying, thermophysical properties, temperature dependence, phase transition.

 

Information about the authors

 

Sharipov Jurabek Gulovich - Tajik National University,

Candidate of Physical and Mathematical Sciences, Associate Professor of the Department of Meteorology and Climatology.

Address: 734025, Dushanbe, Republic of Tajikistan, Rudaki Avenue 17.

Phone: (+992) 935220076. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

 

Nizomov Ziyovuddin - Tajik National University,

Candidate of Physical and Mathematical Sciences, Associate Professor, Leading Researcher of the Research Institute.

Address: 734025, Dushanbe, Republic of Tajikistan, Rudaki Avenue 17. Phone: (+992) 933 00 20 15. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

 

Saidzoda Rahim Hamro - Tajik Technical University named after Academician M.S. Osimi,

Doctor of Technical Sciences, Professor

Address: 73404210, Dushanbe, Republic of Tajikistan,Rajabov Academicians Str.

Phone (+992) 981010072. E-mail: rahsai @mail.ru

 

REVIEWER: Abdulloev H.M., Doctor Physical and mathematical sciences, Professor

 

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Article received: 27.09.2023

Approved after review: 13.10.2023

Accepted for publication: 15.01.2024

   
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