Details
| Original language | English |
|---|---|
| Pages (from-to) | 95-103 |
| Number of pages | 9 |
| Journal | Materials Science and Engineering A |
| Volume | 706 |
| Publication status | Published - 18 Sept 2017 |
Abstract
The effects of prior thermo-mechanical treatment on two-way shape memory effect (TWSME) and its stability under thermal cycles in [001]-oriented Ni49Fe18Ga27Co6 single crystals were investigated. In this study, TWSME in quenched, stress-free and stress-assisted aged crystals was induced by 100 isothermal loading/unloading cycles (ε = 6%, σmax = 140 MPa). Maximum reversible TWSME strain up to 5.5% was observed in stress-assisted aged single crystals in which a full one-way transformation strain εtr is achieved under minimum stress levels and the favourably oriented internal stress fields are formed by the selection of certain precipitate variants during stress-assisted ageing. In quenched and stress-free aged crystals TWSME strains are less than 2.2%. The mechanisms of cycling degradation of TWSME (decrease of TWSME strain and change in martensitic start temperature Ms) have also been discussed. In quenched single crystals, 100 thermal cycles result in irreparable degradation of TWSME. In contrast, age hardening in stress-free and stress-assisted aged crystals results in unchanged Ms temperature during thermal cycles and the restoration of the TWSME strain due to additional training (10 isothermal loading/unloading cycles).
Keywords
- Ageing, Intermetallics, Martensitic transformations, Shape memory, Thermomechanical processing
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Materials Science and Engineering A, Vol. 706, 18.09.2017, p. 95-103.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Two-way shape memory effect under multi-cycles in [001]-oriented Ni49Fe18Ga27Co6 single crystal
AU - Panchenko, E. Yu
AU - Timofeeva, E. E.
AU - Larchenkova, N. G.
AU - Chumlyakov, Yu I.
AU - Tagiltsev, A. I.
AU - Maier, H. J.
AU - Gerstein, G.
N1 - Funding information: This work was supported by the Russian Science Foundation (grant No. 16-19-10250 ).
PY - 2017/9/18
Y1 - 2017/9/18
N2 - The effects of prior thermo-mechanical treatment on two-way shape memory effect (TWSME) and its stability under thermal cycles in [001]-oriented Ni49Fe18Ga27Co6 single crystals were investigated. In this study, TWSME in quenched, stress-free and stress-assisted aged crystals was induced by 100 isothermal loading/unloading cycles (ε = 6%, σmax = 140 MPa). Maximum reversible TWSME strain up to 5.5% was observed in stress-assisted aged single crystals in which a full one-way transformation strain εtr is achieved under minimum stress levels and the favourably oriented internal stress fields are formed by the selection of certain precipitate variants during stress-assisted ageing. In quenched and stress-free aged crystals TWSME strains are less than 2.2%. The mechanisms of cycling degradation of TWSME (decrease of TWSME strain and change in martensitic start temperature Ms) have also been discussed. In quenched single crystals, 100 thermal cycles result in irreparable degradation of TWSME. In contrast, age hardening in stress-free and stress-assisted aged crystals results in unchanged Ms temperature during thermal cycles and the restoration of the TWSME strain due to additional training (10 isothermal loading/unloading cycles).
AB - The effects of prior thermo-mechanical treatment on two-way shape memory effect (TWSME) and its stability under thermal cycles in [001]-oriented Ni49Fe18Ga27Co6 single crystals were investigated. In this study, TWSME in quenched, stress-free and stress-assisted aged crystals was induced by 100 isothermal loading/unloading cycles (ε = 6%, σmax = 140 MPa). Maximum reversible TWSME strain up to 5.5% was observed in stress-assisted aged single crystals in which a full one-way transformation strain εtr is achieved under minimum stress levels and the favourably oriented internal stress fields are formed by the selection of certain precipitate variants during stress-assisted ageing. In quenched and stress-free aged crystals TWSME strains are less than 2.2%. The mechanisms of cycling degradation of TWSME (decrease of TWSME strain and change in martensitic start temperature Ms) have also been discussed. In quenched single crystals, 100 thermal cycles result in irreparable degradation of TWSME. In contrast, age hardening in stress-free and stress-assisted aged crystals results in unchanged Ms temperature during thermal cycles and the restoration of the TWSME strain due to additional training (10 isothermal loading/unloading cycles).
KW - Ageing
KW - Intermetallics
KW - Martensitic transformations
KW - Shape memory
KW - Thermomechanical processing
UR - http://www.scopus.com/inward/record.url?scp=85028887341&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2017.08.108
DO - 10.1016/j.msea.2017.08.108
M3 - Article
AN - SCOPUS:85028887341
VL - 706
SP - 95
EP - 103
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
SN - 0921-5093
ER -