Martensitic Transformation in Shape Memory Alloys under Magnetic Field and Hydrostatic Pressure

Kakeshita, Tomoyuki; Fukuda, Takashi; Sakamoto, Tatsuaki; Takeuchi, Tetsuya; Kindo, Koichi; Endo, Syouichi; Kishio, K.

doi:10.2320/matertrans.43.887

Cited by 16 publications

(12 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7,8) Actually, rearrangement of variants by the magnetic field in Fe-30 at%Pd alloy was first reported by James and Wuttig, 9) and after that by our group. 10,11) In addition, the same behavior was found in Fe 3 Pt by our group. 12) In this paper, we show our new results on rearrangement of martensite variants by magnetic field for two iron-based ferromagnetic shape memory alloys.…”

Section: Introductionsupporting

confidence: 67%

Rearrangement of Martensite Variants in Iron-Based Ferromagnetic Shape Memory Alloys under Magnetic Field

et al. 2004

Self Cite

View full text Add to dashboard Cite

We have investigated magnetic field-induced strain (MFIS) associated with rearrangement of martensite variants and its corresponding magnetization process in a disordered Fe-31.2Pd(at%) single crystal and an ordered Fe 3 Pt single crystal, exhibiting a cubic to tetragonal martensitic transformation at 230 K and 85 K, respectively. When magnetic field is applied along [001] direction to a specimen with a multivariant state, it expands along the field direction for Fe-31.2Pd and contracts for Fe 3 Pt, because the variants whose easy axis of magnetization (a axis for Fe-31.2Pd and c axis for Fe 3 Pt) lies along the field direction is selected to grow. The fraction of such variants reaches 100% for Fe-31.2Pd but does not for Fe 3 Pt. In the field removing process, a part of the MFIS recovers for Fe 3 Pt but does not for Fe-31.2Pd. From the magnetization curve, the energy dissipated due to the rearrangement of variants by magnetic field is obtained to be about 260 kJ/m 3 for Fe-31.2Pd and about 180 kJ/m 3 for Fe 3 Pt. Concerning Fe-31.2Pd, this value is roughly the same as that evaluated by stress-strain curves, suggesting that the rearrangement of variants by magnetic field takes essentially the same path as that by external stress. Based on these results and magnetocrystalline anisotropy constants of martensite phases, the mechanism of rearrangement of variants under magnetic field is discussed from a macroscopic point of view.

show abstract

Section: Introductionsupporting

confidence: 67%

Rearrangement of Martensite Variants in Iron-Based Ferromagnetic Shape Memory Alloys under Magnetic Field

et al. 2004

Self Cite

View full text Add to dashboard Cite

show abstract

“…As mentioned in the introduction, disordered Fe31.2%Pd (at%) alloy 8,9) and ordered Fe 3 Pt 10,11) ferromagnetic alloys show giant MFIS under a magnetic field of 1 or 2 T. These alloys show a few % MFIS in single crystals at atmospheric pressure. Under compressive stress above 3 MPa, these alloys do not show MFIS.…”

Section: Was 14 Ammentioning

confidence: 99%

“…Heusler alloys based on Ni 2 MnGa have been explained by the rearrangement of martensitic structural variants caused by an external field. 1,6,7) Disordered Fe31.2%Pd (at%) alloy (A1-type cubic) 8,9) and ordered Fe 3 Pt (L1 2 type cubic) 10,11) ferromagnetic alloys have also attracted much interest because of their giant MFIS. These materials, NiMnGa, FePd and FePt alloys, have attracted much attention as potential materials for magnetic actuators.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field-Induced Transition in Co-Doped Ni41Co9Mn31.5Ga18.5 Heusler Alloy

et al. 2013

View full text Add to dashboard Cite

Thermal strain, magnetostriction and magnetization measurements of Ni 41 Co 9 Mn 31.5 Ga 18.5 polycrystalline ferromagnetic shape memory alloy (FSMA) were performed across the martensitic transition temperature, T M , and the reverse martensitic transition temperature, T R , at atmospheric pressure. When cooling from the austenite phase, a steep decrease in thermal expansion due to the martensitic transition at T M was found. When heating from the martensitic phase, a steep increase in the thermal expansion due to the reverse martensitic transition at T R was observed. These transition temperatures decreased gradually with increasing magnetic field. The field dependence of the martensitic transition temperature, dT M /dB, is ¹4.2 K/T and that of the reverse martensitic transition temperature, dT R /dB, is ¹7.9 K/T. The metamagnetic transition appeared between 330 and 390 K. The results of thermal strain and magnetization measurements indicate that a magneto-structural transition occurred at T M . The region above T M or T R is the ferromagnetic austenite phase and that below T M or T R is the paramagnetic or weak ferromagnetic martensitic phase. At constant temperature, a magnetic field-induced strain was observed with a value of 1.0 © 10 ¹3 , which indicates that this alloy is sensitive to magnetic fields. Strong magneto-structural coupling was revealed by the magnetic properties and phase transitions.

show abstract

“…The kink was observed at 0.8 T, which also appears in steady field measurements. When the magnetic field was decreased, a recovery of 0.40 % was observed, which contrasts with those of Ni-Mn-Ga or Fe-Pd alloys [3,8,9]. As shown in Figure 3, a small expansion was observed at zero field after 1st shot.…”

Section: Experimental and Discussionmentioning

confidence: 81%

Magnetic-Field-Induced Strain of Fe-based Ferromagnetic Shape-Memory Alloy in a Pulsed Magnetic Field

et al. 2007

Self Cite

View full text Add to dashboard Cite

The magnetic field-induced strain (MFIS) of the martensite metallic compound Fe-31.2% Pd (at.%) and Fe 3 Pt were studied in a pulsed magnetic field using the capacitance method at low temperatures in a martensitic phase, which is much lower than the martensitic transformation temperature T M . After zero field cooling, pulse magnetic field was applied parallel to [001] p axis.Large MFIS has been measured. The value of the MFIS ∆L/L is 0.4 % expansion, 1.7 % compression, respectively. When the magnetic field was decreased, the recovery of the strain of Fe 3 Pt was observed. At the 2nd shot, the strain of about 0.6 % was observed. It means that MFIS occurs even in short-pulse magnetic fields. Both alloys exhibit thermoelastic martensitic transformations to tetragonal structures (f.c.t. martensite) [6, 7]. Kakeshita et al. carried out an experimental study of MFIS of Fe-31.2%Pd (at.%) and Fe 3 Pt alloys under steady magnetic field using a superconducting magnet [8-10]. The martensitic Mater. Res. Soc. Symp. Proc. Vol. 1050

show abstract

Martensitic Transformation in Shape Memory Alloys under Magnetic Field and Hydrostatic Pressure

Cited by 16 publications

References 20 publications

Rearrangement of Martensite Variants in Iron-Based Ferromagnetic Shape Memory Alloys under Magnetic Field

Rearrangement of Martensite Variants in Iron-Based Ferromagnetic Shape Memory Alloys under Magnetic Field

Magnetic Field-Induced Transition in Co-Doped Ni<sub>41</sub>Co<sub>9</sub>Mn<sub>31.5</sub>Ga<sub>18.5</sub> Heusler Alloy

Magnetic-Field-Induced Strain of Fe-based Ferromagnetic Shape-Memory Alloy in a Pulsed Magnetic Field

Contact Info

Product

Resources

About