Details
| Original language | English |
|---|---|
| Pages (from-to) | 1116-1125 |
| Number of pages | 10 |
| Journal | Russian physics journal |
| Volume | 57 |
| Issue number | 8 |
| Publication status | Published - 4 Dec 2014 |
Abstract
In heterophase Ti50.0–xNi50.0+x (х = 0.8–1.0 at.%) single crystals after aging at 823 K for 1.5 h at the heating/cooling rate (15 ± 1) K/min and stepwise aging at 823 K for 1.5 h plus aging at 573–623 K for 1 h, multi-stage martensitic transformations are observed: there are three peaks of heat release in the DSC (differential scanning calorimetry) curves. The first peak is associated with a B2–R-transformation and increased electrical resistance ρ and the other two correspond to the development of an R–B19′-martensitic transformation occurring in two stages, and are followed by a two-stage drop of electrical resistance in the ρ(T) plot. The high-temperature stage of the R–B19′-martensitic transition is associated with transformations under the action of local stress fields in the vicinity of disperse Ti3Ni4 particles measuring ~400 nm, while the low-temperature stage is associated with transformations in the spaces between large particles containing fine disperse β′-phase particles isostructural with respect to the matrix, measuring 3–5 nm, which are formed during slow cooling from 823 K or in the course of low-temperature aging at 573–623 K.
Keywords
- disperse particles, single crystals, thermoelastic martensitic transformations
ASJC Scopus subject areas
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In: Russian physics journal, Vol. 57, No. 8, 04.12.2014, p. 1116-1125.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Features of Multistage Thermoelastic B2–R–B19′ Martensitic Transformations in Heterophase Single Crystals of Ti–Ni Alloys
AU - Panchenko, E. Yu
AU - Chumlyakov, Yu I.
AU - Maier, H.
N1 - Publisher Copyright: © 2014, Springer Science+Business Media New York. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2014/12/4
Y1 - 2014/12/4
N2 - In heterophase Ti50.0–xNi50.0+x (х = 0.8–1.0 at.%) single crystals after aging at 823 K for 1.5 h at the heating/cooling rate (15 ± 1) K/min and stepwise aging at 823 K for 1.5 h plus aging at 573–623 K for 1 h, multi-stage martensitic transformations are observed: there are three peaks of heat release in the DSC (differential scanning calorimetry) curves. The first peak is associated with a B2–R-transformation and increased electrical resistance ρ and the other two correspond to the development of an R–B19′-martensitic transformation occurring in two stages, and are followed by a two-stage drop of electrical resistance in the ρ(T) plot. The high-temperature stage of the R–B19′-martensitic transition is associated with transformations under the action of local stress fields in the vicinity of disperse Ti3Ni4 particles measuring ~400 nm, while the low-temperature stage is associated with transformations in the spaces between large particles containing fine disperse β′-phase particles isostructural with respect to the matrix, measuring 3–5 nm, which are formed during slow cooling from 823 K or in the course of low-temperature aging at 573–623 K.
AB - In heterophase Ti50.0–xNi50.0+x (х = 0.8–1.0 at.%) single crystals after aging at 823 K for 1.5 h at the heating/cooling rate (15 ± 1) K/min and stepwise aging at 823 K for 1.5 h plus aging at 573–623 K for 1 h, multi-stage martensitic transformations are observed: there are three peaks of heat release in the DSC (differential scanning calorimetry) curves. The first peak is associated with a B2–R-transformation and increased electrical resistance ρ and the other two correspond to the development of an R–B19′-martensitic transformation occurring in two stages, and are followed by a two-stage drop of electrical resistance in the ρ(T) plot. The high-temperature stage of the R–B19′-martensitic transition is associated with transformations under the action of local stress fields in the vicinity of disperse Ti3Ni4 particles measuring ~400 nm, while the low-temperature stage is associated with transformations in the spaces between large particles containing fine disperse β′-phase particles isostructural with respect to the matrix, measuring 3–5 nm, which are formed during slow cooling from 823 K or in the course of low-temperature aging at 573–623 K.
KW - disperse particles
KW - single crystals
KW - thermoelastic martensitic transformations
UR - http://www.scopus.com/inward/record.url?scp=84925543285&partnerID=8YFLogxK
U2 - 10.1007/s11182-014-0352-1
DO - 10.1007/s11182-014-0352-1
M3 - Article
AN - SCOPUS:84925543285
VL - 57
SP - 1116
EP - 1125
JO - Russian physics journal
JF - Russian physics journal
SN - 1064-8887
IS - 8
ER -