Superelasticity in Quenched and Aged FeMnAlNiTi Oligocrystals under Compression

• Published in: Russian physics journal 2021-04, Vol.63 (12), p.2205-2211
• Main Authors: Kuksgauzen, I. V., Poklonov, V. V., Chumlyakov, Yu. I., Kuksgauzen, D. A., Kirillov, V. A.
• Format: Article
• Language: English
• Subjects: Alloys; Condensed Matter Physics; Condensed-State Physics; Hadrons; Heavy Ions; Lasers; Martensitic transformations; Mathematical and Computational Physics; Nuclear Physics; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; Quenching; Room temperature; Superelasticity; Theoretical
• ISSN: 1064-8887; 1573-9228
• DOI: 10.1007/s11182-021-02289-3

The paper studies superelasticity in a 203–523 K temperature range of the 42.5Fe-34Mn-15Al-7.5Ni-1Ti at.% oligocrystals quenched and aged at 473 K for 3 hours. It is shown that the critical stress for the stress-induced α-γ' martensitic transformation slightly grows with the test temperature increasing in accordance with the Clausius–Clapeyron relation. The value of α = dσc r /dT characterizing this growth in quenched and aged oligocrystals, is close to 0.46 and 0.37 MPa/K, respectively. Regardless of the structural condition, superelasticity is observed within the whole mentioned temperature range. At room temperature, the maximum superelasticity is 6.0 and 6.8% of quenched and aged oligocrystals, respectively. A rapid degradation of the functional properties of oligocrystals is detected during the loading-unloading cycles at room temperature. After ten isothermal loading-unloading cycles, residual strain of 2.8 and 1.7% is observed in quenched and aged oligocrystals, respectively.