Changes in the Structural-Phase State of Ti49.3Ni50.7 Alloy at the Initial Stages of Aging After Quenching from the B2-Phase Homogeneity Region; Shape Memory and Superelasticity; Vol. 12
| Parent link: | Shape Memory and Superelasticity.— .— Materials Park: ASM International Vol. 12.— 2026.— P. 644-655 |
|---|---|
| Співавтор: | |
| Інші автори: | , , , , |
| Резюме: | Title screen In the paper, electrometric measurement, X-ray diffraction analysis, and positron lifetime spectroscopy are carried out to study changes in the structural-phase state and lattice defects of the Ti49.3Ni50.7 alloy samples after quenching from 1073 K and subsequent annealing at 573, 673, and 773 K. After quenching, the Ti49.3Ni50.7 alloy samples are in the B2-phase state with a slightly increased concentration of vacancies in the nickel sublattice. Annealing at 573 K for 1 h causes a highly inhomogeneous structural-phase state in the samples: the concentration of vacancies in the nickel sublattice increases (probably due to the formation of Guinier–Preston zones), and the R phase and a small amount of the Ti3Ni4 phase appear. With an increase in the annealing temperature, the volume fraction of the R phase changes along a single-peaked curve, and that of the Ti3Ni4 phase monotonically grows to 4%. In all samples, the scalar dislocation density ρd approaches the lower detection limit of the used investigation methods (~ 1012‒1013 m−2). Based on the obtained results, it can be expected that high fatigue life and the most significant strengthening of the Ti49.3Ni50.7 (at%) alloy samples may be achieved in the annealing temperature range of 523–673 K, depending on the average size of grains–subgrains Текстовый файл AM_Agreement |
| Мова: | Англійська |
| Опубліковано: |
2026
|
| Предмети: | |
| Онлайн доступ: | https://doi.org/10.1007/s40830-026-00633-5 |
| Формат: | Електронний ресурс Частина з книги |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=688650 |
| Резюме: | Title screen In the paper, electrometric measurement, X-ray diffraction analysis, and positron lifetime spectroscopy are carried out to study changes in the structural-phase state and lattice defects of the Ti49.3Ni50.7 alloy samples after quenching from 1073 K and subsequent annealing at 573, 673, and 773 K. After quenching, the Ti49.3Ni50.7 alloy samples are in the B2-phase state with a slightly increased concentration of vacancies in the nickel sublattice. Annealing at 573 K for 1 h causes a highly inhomogeneous structural-phase state in the samples: the concentration of vacancies in the nickel sublattice increases (probably due to the formation of Guinier–Preston zones), and the R phase and a small amount of the Ti3Ni4 phase appear. With an increase in the annealing temperature, the volume fraction of the R phase changes along a single-peaked curve, and that of the Ti3Ni4 phase monotonically grows to 4%. In all samples, the scalar dislocation density ρd approaches the lower detection limit of the used investigation methods (~ 1012‒1013 m−2). Based on the obtained results, it can be expected that high fatigue life and the most significant strengthening of the Ti49.3Ni50.7 (at%) alloy samples may be achieved in the annealing temperature range of 523–673 K, depending on the average size of grains–subgrains Текстовый файл AM_Agreement |
|---|---|
| DOI: | 10.1007/s40830-026-00633-5 |