Special features of functional properties in heterophase high-strength Ni_50.2Ti_37.3Hf_12.5 polycrystals and single crystals | Izvestiya vuzov. Fizika. 2019. № 3. DOI: 10.17223/00213411/62/3/131

Special features of functional properties in heterophase high-strength Ni_50.2Ti_37.3Hf_12.5 polycrystals and single crystals

Stress-induced B 2- B 19' martensitic transformations (MTs) were studied in aged at 773 K, 3 h polycrystals and single crystals of Ni_50.2Ti_37.3Hf_12.5 (at. %) alloy. Single crystals are characterized by much lower transformation temperatures (on 100 K) in comparison with polycrystals. Ageing of single crystals results in precipitation of H - and H '-phase particles with the size up to 15 nm, which lead to the significant strengthening of B 2-phase σ _cr ( B 2) = 1540 MPa and the manifestation of superelasticity (SE) in temperature interval of 90 K. Low strength properties of B 2-phase σ _cr ( B 2) = 950 MPa in polycrystals are caused by the precipitation of only H -phase particles and this is the reason of the absence of SE. Additional stress-induced martensite ageing (SIM-ageing) of polycrystals leads to the increase of strength properties of B 2-phase in 1.5 times up to 1450 MPa. This is the reason of the appearance of high-temperature SE in wide temperature interval of 110 K. Moreover, polycrystals after SIM-ageing are characterized by high transformation temperatures, lower temperature intervals of stress-induced MT and maximum reversible strain up to 2.0%.

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Keywords

thermal treatment, single crystals, thermoelastic martensitic transformations, superelasticity, термическая обработка, монокристаллы, термоупругие мартенситные превращения, сверхэластичность

Authors

Name	Organization	E-mail
Tagiltsev A.I.	V. D. Kuznetsov Physical-Technical Institute at Tomsk State University	antontgl@gmail.com
Surikov N.Yu.	V. D. Kuznetsov Physical-Technical Institute at Tomsk State University	jet_n@mail.ru
Panchenko E.Yu.	V. D. Kuznetsov Physical-Technical Institute at Tomsk State University	panchenko@mail.tsu.ru
Chumlyakov Yu.I.	V. D. Kuznetsov Physical-Technical Institute at Tomsk State University	chum@phys.tsu.ru
Karaman I.	Texas A&M University, College Station	ikaraman@tamu.edu

Всего: 5

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