Superelasticity in quenched and aged oligocrystals of femnalniti alloy in compression
The superelasticity in the temperature range from 203 to 523 K in quenched and aged at T = 473 K for 3 hours oligocrystals of Fe42.5Mn34Al15Ni7.5Ti1 (at. %) alloy was studied. It is shown that the critical stresses for the stress-induced α-γ' martensitic transformation slightly increased when the test temperature increased in accordance to the Clausius-Clapeyron relationship. The value α = d σcr/ d T characterizing this growth in quenched and aged oligocrystals has close values of 0.46 and 0.37 MPa/K, respectively. Regardless of the structural state, superelasticity is observed in the studied temperature range from 203 to 523 K. The maximum superelasticity at room temperature is 6.0 and 6.8% in a quenched and aged oligocrystal, respectively. Rapid degradation of functional properties was detected during the loading/unloading cycle at room temperature. Thus, after the 10th isothermal cycle in quenched oligocrystals a residual strain εirr of 2.8% is observed and in aged oligocrystals εirr = 1.7%.
Keywords
iron-based FeMnAlNiTi alloy,
oligocrystal,
martensitic transformation,
superelasticity,
cyclic stabilityAuthors
| Kuksgauzen I.V. | V.D. Kuznetsov Siberian Physical-Technical Institute at Tomsk State University | irbas@sibmail.com |
| Poklonov V.V. | V.D. Kuznetsov Siberian Physical-Technical Institute at Tomsk State University | poklonov_vyacheslav@mail.ru |
| Chumlyakov Y.I. | V.D. Kuznetsov Siberian Physical-Technical Institute at Tomsk State University | chum@phys.tsu.ru |
| Kuksgauzen D.A. | V.D. Kuznetsov Siberian Physical-Technical Institute at Tomsk State University | kuksgauzen90@gmail.com |
| Kirillov V.A. | V.D. Kuznetsov Siberian Physical-Technical Institute at Tomsk State University | vladk@sibmail.com |
Всего: 5
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