Details
| Original language | English |
|---|---|
| Pages (from-to) | 89-99 |
| Number of pages | 11 |
| Journal | Journal of Magnetism and Magnetic Materials |
| Volume | 292 |
| Publication status | Published - Apr 2005 |
| Externally published | Yes |
Abstract
We report on the shape memory characteristics and magnetic behavior of polycrystalline and single crystalline FeNiCoTi. Predeforming the samples in the martensitic state and biasing of the martensite variants produced anisotropy in the magnetization behavior allowing the 'easy axis' to be identified as the 'a-axis' in the martensitic state. Based on these results, we provide an estimate of the magnetic anisotropy energy as 8.34×105 ergs/cm3. The results confirm the different magnetization behavior in the martensitic and austenitic states, and the shift in transformation temperatures upon application of a magnetic field. Shape memory strains near 2.5% are demonstrated under constant stress temperature cycling and upon heating at zero stress after deformation. We present a thermodynamics based theory that explains the origin of the hysteresis in this class of alloys emanating from the dissipation of energy due to plastic deformation. We predict the thermal hysteresis (135 K), and the shift in transformation temperature (14 K) with applied magnetic fields in agreement with the experimental results. The possibility of utilizing these classes of alloys as magnetic shape memory alloys is discussed.
Keywords
- Anisotropy, Energy dissipation, Magnetic shape memory
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Journal of Magnetism and Magnetic Materials, Vol. 292, 04.2005, p. 89-99.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Magnetization, shape memory and hysteresis behavior of single and polycrystalline FeNiCoTi
AU - Sehitoglu, H.
AU - Efstathiou, C.
AU - Maier, H. J.
AU - Chumlyakov, Y.
N1 - Funding Information: The work is partially supported by Air Force Office of Scientific Research, Directorate of Aerospace and Materials Sciences, Arlington, Virginia under Grant #F49620-01-1-0136, and also NSF Grants CMS-0332824 and CMS-0428428.
PY - 2005/4
Y1 - 2005/4
N2 - We report on the shape memory characteristics and magnetic behavior of polycrystalline and single crystalline FeNiCoTi. Predeforming the samples in the martensitic state and biasing of the martensite variants produced anisotropy in the magnetization behavior allowing the 'easy axis' to be identified as the 'a-axis' in the martensitic state. Based on these results, we provide an estimate of the magnetic anisotropy energy as 8.34×105 ergs/cm3. The results confirm the different magnetization behavior in the martensitic and austenitic states, and the shift in transformation temperatures upon application of a magnetic field. Shape memory strains near 2.5% are demonstrated under constant stress temperature cycling and upon heating at zero stress after deformation. We present a thermodynamics based theory that explains the origin of the hysteresis in this class of alloys emanating from the dissipation of energy due to plastic deformation. We predict the thermal hysteresis (135 K), and the shift in transformation temperature (14 K) with applied magnetic fields in agreement with the experimental results. The possibility of utilizing these classes of alloys as magnetic shape memory alloys is discussed.
AB - We report on the shape memory characteristics and magnetic behavior of polycrystalline and single crystalline FeNiCoTi. Predeforming the samples in the martensitic state and biasing of the martensite variants produced anisotropy in the magnetization behavior allowing the 'easy axis' to be identified as the 'a-axis' in the martensitic state. Based on these results, we provide an estimate of the magnetic anisotropy energy as 8.34×105 ergs/cm3. The results confirm the different magnetization behavior in the martensitic and austenitic states, and the shift in transformation temperatures upon application of a magnetic field. Shape memory strains near 2.5% are demonstrated under constant stress temperature cycling and upon heating at zero stress after deformation. We present a thermodynamics based theory that explains the origin of the hysteresis in this class of alloys emanating from the dissipation of energy due to plastic deformation. We predict the thermal hysteresis (135 K), and the shift in transformation temperature (14 K) with applied magnetic fields in agreement with the experimental results. The possibility of utilizing these classes of alloys as magnetic shape memory alloys is discussed.
KW - Anisotropy
KW - Energy dissipation
KW - Magnetic shape memory
UR - http://www.scopus.com/inward/record.url?scp=15844376659&partnerID=8YFLogxK
U2 - 10.1016/j.jmmm.2004.10.101
DO - 10.1016/j.jmmm.2004.10.101
M3 - Article
AN - SCOPUS:15844376659
VL - 292
SP - 89
EP - 99
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
ER -