Bibliographic Details
| Title: |
Influence of the number of particle variants on the cyclic stability of superelasticity in Ti-51.5at.%Ni single crystals. |
| Authors: |
Timofeeva, E.E.1 (AUTHOR), Zherdeva, M.V.1 (AUTHOR), Tagiltsev, A.I.1 (AUTHOR) antontgl@mail.tsu.ru, Panchenko, E.Yu.1 (AUTHOR), Chumlyakov, Yu.I.1 (AUTHOR) |
| Source: |
Materials Letters. Oct2024, Vol. 372, pN.PAG-N.PAG. 1p. |
| Subjects: |
Single crystals, Martensitic transformations, Crystals |
| Abstract: |
• Cyclic stability of high-temperature superelasticity was determined in Ti-51.5at.%Ni. • Stress-free and stress-assisted aged 〈0 0 1〉 -oriented single crystals were studied. • The number of Ti 3 Ni 4 particle variants effected on the cyclic stability. • Four particle variants provided higher cyclic stability than one variant. • It results from the different strength properties of the B2-phase and B19′-martensite. The influence of the crystallographic variants of Ti 3 Ni 4 particles on the cyclic stability of the high-temperature superelasticity of 〈0 0 1〉 -oriented Ti-51.5at.%Ni single crystals after stress-free and stress-assisted aging at 823 K for 1 h was investigated for the first time. After stress-assisted aging, the single crystals exhibited low cyclic stability of superelasticity (irreversible strain was 5.2 %, and critical stresses decreased by 14 %). After cycling, single dislocations and {1 1 5} B2 twins were observed, as a consequence of B2-B19′-B2 martensitic transformations. After stress-free aging, single crystals showed high cyclic stability: critical stresses were practically unchanged, and the irreversible strain did not exceed 0.2 %. No defects were found after cyclic testing; the stress-free aged crystals had the high strength properties of the B2-phase (2100 MPa) and B19′-martensite (>2700 MPa), in contrast to the stress-assisted aged single crystals, which had the strength properties of the B2-phase, 1630 MPa, and B19′-martensite, 1650 MPa. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
