Details
| Original language | English |
|---|---|
| Pages (from-to) | 1534-1543 |
| Number of pages | 10 |
| Journal | Russian physics journal |
| Volume | 58 |
| Issue number | 11 |
| Publication status | Published - 19 Mar 2016 |
Abstract
The features of orientation dependence of stress-induced thermoelastic B2–(R)–B19′-martensitic transformations in single crystals of the Ti48.5Ni51.5 and Ni51.0Ti36.5Hf12.5 (at.%) alloys, which contain disperse particles of the Ti3Ni4 and H-phase, respectively, are revealed along with those of their shape-memory effects (SME) and superelasticity (SE). It is experimentally demonstrated that irrespective of the crystal structure of disperse particles measuring more than 100 nm, for their volume fraction f > 16% there is a weaker orientation dependence of the reversible strain in the cases of manifestation of SME and SE. In the orientations of Class I, wherein martensitic detwinning introduces a considerable contribution into transformation strain, the values of SME |εSME| and SE |εSE| decrease by over a factor of two compared to the theoretical lattice strain value |εtr0| for a B2–B19′-transformation and the experimental values of reversible strain for quenched TiNi crystals. In the orientations of Class 2, wherein detwinning of the martensite is suppressed as is the case in quenched single-phase single crystals, the reversible strain is maintained close to its theoretical value |εtr0|. Micromechanical models of interaction between the martensite and the disperse particles are proposed, which account for the weaker orientation dependence of |εSME| and |εSE| due to suppression of detwinning of the B19′-martensite crystals by the particles and a transition from a single-variant evolution of the stress-induced martensitic transformations to a multiple-variant evolution of transformations in the cases of increased size of the particles and their larger volume fractions.
Keywords
- disperse particles, shape memory effect, single crystals, superelasticity, thermoelastic martensitic transformations
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Russian physics journal, Vol. 58, No. 11, 19.03.2016, p. 1534-1543.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Orientation Dependence of Functional Properties in Heterophase Single Crystals of the Ti36.5Ni51.0Hf12.5 and Ti48.5Ni51.5 Alloys
AU - Panchenko, E. Yu
AU - Chumlyakov, Yu I.
AU - Surikov, N. Yu
AU - Tagiltsev, A. I.
AU - Vetoshkina, N. G.
AU - Osipovich, K. S.
AU - Maier, H.
AU - Sehitoglu, H.
PY - 2016/3/19
Y1 - 2016/3/19
N2 - The features of orientation dependence of stress-induced thermoelastic B2–(R)–B19′-martensitic transformations in single crystals of the Ti48.5Ni51.5 and Ni51.0Ti36.5Hf12.5 (at.%) alloys, which contain disperse particles of the Ti3Ni4 and H-phase, respectively, are revealed along with those of their shape-memory effects (SME) and superelasticity (SE). It is experimentally demonstrated that irrespective of the crystal structure of disperse particles measuring more than 100 nm, for their volume fraction f > 16% there is a weaker orientation dependence of the reversible strain in the cases of manifestation of SME and SE. In the orientations of Class I, wherein martensitic detwinning introduces a considerable contribution into transformation strain, the values of SME |εSME| and SE |εSE| decrease by over a factor of two compared to the theoretical lattice strain value |εtr0| for a B2–B19′-transformation and the experimental values of reversible strain for quenched TiNi crystals. In the orientations of Class 2, wherein detwinning of the martensite is suppressed as is the case in quenched single-phase single crystals, the reversible strain is maintained close to its theoretical value |εtr0|. Micromechanical models of interaction between the martensite and the disperse particles are proposed, which account for the weaker orientation dependence of |εSME| and |εSE| due to suppression of detwinning of the B19′-martensite crystals by the particles and a transition from a single-variant evolution of the stress-induced martensitic transformations to a multiple-variant evolution of transformations in the cases of increased size of the particles and their larger volume fractions.
AB - The features of orientation dependence of stress-induced thermoelastic B2–(R)–B19′-martensitic transformations in single crystals of the Ti48.5Ni51.5 and Ni51.0Ti36.5Hf12.5 (at.%) alloys, which contain disperse particles of the Ti3Ni4 and H-phase, respectively, are revealed along with those of their shape-memory effects (SME) and superelasticity (SE). It is experimentally demonstrated that irrespective of the crystal structure of disperse particles measuring more than 100 nm, for their volume fraction f > 16% there is a weaker orientation dependence of the reversible strain in the cases of manifestation of SME and SE. In the orientations of Class I, wherein martensitic detwinning introduces a considerable contribution into transformation strain, the values of SME |εSME| and SE |εSE| decrease by over a factor of two compared to the theoretical lattice strain value |εtr0| for a B2–B19′-transformation and the experimental values of reversible strain for quenched TiNi crystals. In the orientations of Class 2, wherein detwinning of the martensite is suppressed as is the case in quenched single-phase single crystals, the reversible strain is maintained close to its theoretical value |εtr0|. Micromechanical models of interaction between the martensite and the disperse particles are proposed, which account for the weaker orientation dependence of |εSME| and |εSE| due to suppression of detwinning of the B19′-martensite crystals by the particles and a transition from a single-variant evolution of the stress-induced martensitic transformations to a multiple-variant evolution of transformations in the cases of increased size of the particles and their larger volume fractions.
KW - disperse particles
KW - shape memory effect
KW - single crystals
KW - superelasticity
KW - thermoelastic martensitic transformations
UR - http://www.scopus.com/inward/record.url?scp=84961218235&partnerID=8YFLogxK
U2 - 10.1007/s11182-016-0679-x
DO - 10.1007/s11182-016-0679-x
M3 - Article
AN - SCOPUS:84961218235
VL - 58
SP - 1534
EP - 1543
JO - Russian physics journal
JF - Russian physics journal
SN - 1064-8887
IS - 11
ER -