Details
| Original language | English |
|---|---|
| Pages (from-to) | 6123-6134 |
| Number of pages | 12 |
| Journal | Acta materialia |
| Volume | 57 |
| Issue number | 20 |
| Publication status | Published - Dec 2009 |
| Externally published | Yes |
Abstract
This study reports on the role of repeated stress-induced martensite (SIM) transformations on the pseudoelastic (PE) behavior of solutionized Co35Ni35Al30 [0 0 1]-oriented shape memory single crystals under both isothermal and non-isothermal conditions (referred to as "training"). It is demonstrated that training results in austenite stabilization and strengthening, consequently increasing the critical transformation stress levels for the SIM (σcritSIM), and promoting excellent cyclic stability and reproducibility of the PE response. This is attributed to the formation of dense dislocation arrangements and fine coherent sub-nanometer hexagonal close-packed Co and γ′ (Ni3Al:L12) precipitates during training. The training that involved cyclic loading conditions was more effective than the monotonic stress-strain tests at different temperatures in modifying SIM characteristics bringing about (i) a large pseudoelastic temperature range of 350 °C with σcritSIM levels reaching 1 GPa with complete recoverable strains of 2%, and (ii) excellent stable cyclic PE response at temperatures as high as 250 °C.
Keywords
- Austenite stabilization, Cyclic deformation, High-temperature shape memory alloys, Pseudoelasticity, Stress-induced martensite
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Polymers and Plastics
- Materials Science(all)
- Metals and Alloys
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In: Acta materialia, Vol. 57, No. 20, 12.2009, p. 6123-6134.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Cyclic deformation and austenite stabilization in Co35Ni35Al30 single crystalline high-temperature shape memory alloys
AU - Dadda, J.
AU - Maier, H. J.
AU - Karaman, I.
AU - Chumlyakov, Y. I.
N1 - Funding Information: The present study was supported by Deutsche Forschungsgemeinschaft (DFG), US Army Research Office, Contract No. W911NF-06-1-0319, the US National Science Foundation – Division of Materials Research , Grant No. 0805293 and by the Russian Foundation for Basic Research, Project No. 08-08-91952 NNIO-a.
PY - 2009/12
Y1 - 2009/12
N2 - This study reports on the role of repeated stress-induced martensite (SIM) transformations on the pseudoelastic (PE) behavior of solutionized Co35Ni35Al30 [0 0 1]-oriented shape memory single crystals under both isothermal and non-isothermal conditions (referred to as "training"). It is demonstrated that training results in austenite stabilization and strengthening, consequently increasing the critical transformation stress levels for the SIM (σcritSIM), and promoting excellent cyclic stability and reproducibility of the PE response. This is attributed to the formation of dense dislocation arrangements and fine coherent sub-nanometer hexagonal close-packed Co and γ′ (Ni3Al:L12) precipitates during training. The training that involved cyclic loading conditions was more effective than the monotonic stress-strain tests at different temperatures in modifying SIM characteristics bringing about (i) a large pseudoelastic temperature range of 350 °C with σcritSIM levels reaching 1 GPa with complete recoverable strains of 2%, and (ii) excellent stable cyclic PE response at temperatures as high as 250 °C.
AB - This study reports on the role of repeated stress-induced martensite (SIM) transformations on the pseudoelastic (PE) behavior of solutionized Co35Ni35Al30 [0 0 1]-oriented shape memory single crystals under both isothermal and non-isothermal conditions (referred to as "training"). It is demonstrated that training results in austenite stabilization and strengthening, consequently increasing the critical transformation stress levels for the SIM (σcritSIM), and promoting excellent cyclic stability and reproducibility of the PE response. This is attributed to the formation of dense dislocation arrangements and fine coherent sub-nanometer hexagonal close-packed Co and γ′ (Ni3Al:L12) precipitates during training. The training that involved cyclic loading conditions was more effective than the monotonic stress-strain tests at different temperatures in modifying SIM characteristics bringing about (i) a large pseudoelastic temperature range of 350 °C with σcritSIM levels reaching 1 GPa with complete recoverable strains of 2%, and (ii) excellent stable cyclic PE response at temperatures as high as 250 °C.
KW - Austenite stabilization
KW - Cyclic deformation
KW - High-temperature shape memory alloys
KW - Pseudoelasticity
KW - Stress-induced martensite
UR - http://www.scopus.com/inward/record.url?scp=70350536550&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2009.08.038
DO - 10.1016/j.actamat.2009.08.038
M3 - Article
AN - SCOPUS:70350536550
VL - 57
SP - 6123
EP - 6134
JO - Acta materialia
JF - Acta materialia
SN - 1359-6454
IS - 20
ER -