The influence of ultrasonic treatment on the microstructure in hot-rolled (Ni$_{54}$Fe$_{19}$Ga$_{27}$)$_{99.7}$B$_{0.3}$ polycrystals

N. Yu. Surikov^a, E. Yu. Panchenko^a, V. V. Rubanik^b, V. V. Rubanik (Jr.)^b, Yu. V. Tsarenko^b, Yu. I. Chumlyakov<sup>a

a</sup> Tomsk State University
^b Institute of Technical Acoustics, Academy of Sciences of Belarus, Vitebsk

Abstract: The effect of ultrasonic treatment on the microstructure and the potential of ultrasonic treatment to optimize the elastocaloric effect in hot-rolled Heusler (Ni$_{54}$Fe$_{19}$Ga$_{27}$)$_{99.7}$B$_{0.3}$ shape memory alloys were investigated. It was shown that ultrasonic treatment at cryogenic temperatures below the martensitic transformation temperatures leads to the dissolution of $\gamma(\gamma')$-phase particles. Whereas ultrasonic treatment at room temperature does not lead to such an effect, but promotes atomic $\gamma$-$\gamma'$ ordering of secondary phase particles.

Keywords: Heusler alloys, hot rolling, ultrasonic treatment, microstructure, elastocaloric effect.

Received: 30.04.2025
Revised: 16.07.2025
Accepted: 16.07.2025

DOI: 10.61011/PJTF.2025.20.61400.20365

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