Research output: Contribution to journal › Article › peer-review
Aging Effect on the One-Way and Two-Way Shape Memory in TiNi-Based Alloys. / Beliaev, F. S.; Evard, M. E.; Ostropiko, E. S.; Razov, A. I.; Volkov, A. E.
In: Shape Memory and Superelasticity, Vol. 5, No. 3, 01.09.2019, p. 218-229.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Aging Effect on the One-Way and Two-Way Shape Memory in TiNi-Based Alloys
AU - Beliaev, F. S.
AU - Evard, M. E.
AU - Ostropiko, E. S.
AU - Razov, A. I.
AU - Volkov, A. E.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - The influence of aging of TiNi-based shape memory alloy (SMA) specimens on the one-way and two-way shape memory (TWSM) is studied experimentally and simulated with the use of a microstructural model. Experiments show that a long-time storage of preliminarily strained TiNi specimens does not change the strain recovery on heating. At the same time, the strain stroke due to the realization of the TWSM is bigger than before aging. Computer modeling of these phenomena is done within the frames of a microstructural model, in which the macroscopic strain is considered to be the average of the micro-strains–strains of micro-volumes. The irreversible strains are described from the standpoint of the plastic flow theory. Isotropic hardening and kinematic hardening are taken into account and are related to scattered and oriented deformation defects. To describe the effects of aging, special terms are introduced into the evolution equations for the defect densities. Thus, modified equations are able to account for a decrease of the yield limit due to a decrease of the deformation defect densities. The results of modeling show a good qualitative agreement with the experimental data, particularly an increase of the TWSM deformation after aging.
AB - The influence of aging of TiNi-based shape memory alloy (SMA) specimens on the one-way and two-way shape memory (TWSM) is studied experimentally and simulated with the use of a microstructural model. Experiments show that a long-time storage of preliminarily strained TiNi specimens does not change the strain recovery on heating. At the same time, the strain stroke due to the realization of the TWSM is bigger than before aging. Computer modeling of these phenomena is done within the frames of a microstructural model, in which the macroscopic strain is considered to be the average of the micro-strains–strains of micro-volumes. The irreversible strains are described from the standpoint of the plastic flow theory. Isotropic hardening and kinematic hardening are taken into account and are related to scattered and oriented deformation defects. To describe the effects of aging, special terms are introduced into the evolution equations for the defect densities. Thus, modified equations are able to account for a decrease of the yield limit due to a decrease of the deformation defect densities. The results of modeling show a good qualitative agreement with the experimental data, particularly an increase of the TWSM deformation after aging.
KW - Aging
KW - Microstructural model
KW - Modeling
KW - Shape memory
KW - Two-way shape memory
KW - STORAGE
KW - MARTENSITE
KW - SELF-ACCOMMODATION
KW - BEHAVIOR
KW - TIME
UR - http://www.scopus.com/inward/record.url?scp=85071462149&partnerID=8YFLogxK
UR - http://www.mendeley.com/research/aging-effect-oneway-twoway-shape-memory-tinibased-alloys
U2 - 10.1007/s40830-019-00226-5
DO - 10.1007/s40830-019-00226-5
M3 - Article
AN - SCOPUS:85071462149
VL - 5
SP - 218
EP - 229
JO - Shape Memory and Superelasticity
JF - Shape Memory and Superelasticity
SN - 2199-384X
IS - 3
ER -
ID: 46133679