Details
| Original language | English |
|---|---|
| Pages (from-to) | 3791-3799 |
| Number of pages | 9 |
| Journal | Acta materialia |
| Volume | 56 |
| Issue number | 15 |
| Publication status | Published - Sept 2008 |
| Externally published | Yes |
Abstract
Using in situ digital image correlation to obtain full-field measurements, we study the intermartensitic transformations in single-crystal NiFeGa. Full-field strain measurements identify the coexistence of modulated martensite phases during the first plateau of the multistage stress-strain curve at room temperature. At a higher temperature, the measurements indicate the bypassing of one of the modulated phases. Strain as high as 13% is measured as a result of the transformation to the intermediate monoclinic modulated and final tetragonal phase. Based on the full-field strain measurements, the phase fractions during the nucleation and the progression of the transformation are obtained. The evolution of the local strain and the phase fractions prove critical in explaining strain softening, hysteresis and other phenomena observed in the stress-strain curves.
Keywords
- Digital image correlation, Martensitic transformation, Metastable phases, Nucleation of phase transformations, Shape memory alloy (SMA)
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. 56, No. 15, 09.2008, p. 3791-3799.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Full-field strain evolution during intermartensitic transformations in single-crystal NiFeGa
AU - Efstathiou, C.
AU - Sehitoglu, H.
AU - Carroll, J.
AU - Lambros, J.
AU - Maier, H. J.
N1 - Funding Information: This work was partially supported by the Fracture Control Program, the Midwest Structural Sciences Center (MSSC), and the National Science Foundation CMS-0428428. The MSSC is supported by the US Air Force Research Laboratory Air Vehicles Directorate under contract number FA8650-06-2-3620. The single-crystals were obtained from Prof. Yuri Chumlyakov, Tomsk State University, Russia.
PY - 2008/9
Y1 - 2008/9
N2 - Using in situ digital image correlation to obtain full-field measurements, we study the intermartensitic transformations in single-crystal NiFeGa. Full-field strain measurements identify the coexistence of modulated martensite phases during the first plateau of the multistage stress-strain curve at room temperature. At a higher temperature, the measurements indicate the bypassing of one of the modulated phases. Strain as high as 13% is measured as a result of the transformation to the intermediate monoclinic modulated and final tetragonal phase. Based on the full-field strain measurements, the phase fractions during the nucleation and the progression of the transformation are obtained. The evolution of the local strain and the phase fractions prove critical in explaining strain softening, hysteresis and other phenomena observed in the stress-strain curves.
AB - Using in situ digital image correlation to obtain full-field measurements, we study the intermartensitic transformations in single-crystal NiFeGa. Full-field strain measurements identify the coexistence of modulated martensite phases during the first plateau of the multistage stress-strain curve at room temperature. At a higher temperature, the measurements indicate the bypassing of one of the modulated phases. Strain as high as 13% is measured as a result of the transformation to the intermediate monoclinic modulated and final tetragonal phase. Based on the full-field strain measurements, the phase fractions during the nucleation and the progression of the transformation are obtained. The evolution of the local strain and the phase fractions prove critical in explaining strain softening, hysteresis and other phenomena observed in the stress-strain curves.
KW - Digital image correlation
KW - Martensitic transformation
KW - Metastable phases
KW - Nucleation of phase transformations
KW - Shape memory alloy (SMA)
UR - http://www.scopus.com/inward/record.url?scp=48449097711&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2008.04.033
DO - 10.1016/j.actamat.2008.04.033
M3 - Article
AN - SCOPUS:48449097711
VL - 56
SP - 3791
EP - 3799
JO - Acta materialia
JF - Acta materialia
SN - 1359-6454
IS - 15
ER -