Shape Memory Effect of Sputtered Ni-rich Ni&lt;SUB&gt;2&lt;/SUB&gt;MnGa Alloy Films Aged in Constraint Condition

Isokawa, Shinji; Suzuki, Misako; Ohtsuka, Makoto; Matsumoto, M.; Itagaki, Kimio

doi:10.2320/matertrans.42.1886

Cited by 23 publications

(13 citation statements)

References 5 publications

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“…It has been found by the authors that the Ni 2 MnGa films, prepared by the sputtering method and aged at various temperatures in a constrained condition after the heat treatment at 1073 K, have the two-way SME by thermal change. 15,16) Furthermore, the magnetic-field induced SME was found for the constraint-aged films by shifting the martensitic transformation temperature. 17,18) However, the effect of alloy composition on the two-way SME by temperature change for the ferromagnetic Ni 2 MnGa constraint-aged films has not been clarified.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-Field Induced Two-Way Shape Memory Effect of Ferromagnetic Ni<SUB>2</SUB>MnGa Sputtered Films

et al. 2006

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The shape memory effect (SME) induced by the magnetic field is interesting and important for physics and application. The ferromagnetic Ni 2 MnGa films with various compositions were deposited on a poly-vinyl alcohol (PVA) substrate with a radio-frequency (RF) magnetron sputtering apparatus using four kinds of Ni-Mn-Ga targets. After separating from the substrate, the films were heat-treated at 1073 K for 3.6 ks for homogenization and aged at 673 K for 3.6 ks in a constraint condition. The reversible two-way SME by the thermal change was confirmed for the constraint-aged films with various compositions. The gradient of the strain-temperature curve, the amount of strain accompanied by the twoway SME and the width of thermal hysteresis were dependent on the composition of the films. The strain-temperature curve shifted to a high temperature region and the martensitic phase was stabilized by the applied magnetic field. Furthermore, the two-way SME by the magnetic field was observed around the martensitic transformation temperature on cooling for the constraint-aged film, which showed the large gradient and small thermal hysteresis in the strain-temperature curve.

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Section: Introductionmentioning

confidence: 99%

Magnetic-Field Induced Two-Way Shape Memory Effect of Ferromagnetic Ni<SUB>2</SUB>MnGa Sputtered Films

et al. 2006

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“…Hence, it is very difficult to make a plate or wire from the polycrystal material, and the reducing of the brittleness is indispensable to develop a material for practical use. It was found by the authors [5][6][7] that the Ni-Mn-Ga sputtered films were more flexible than the bulk specimen and exhibited the shape memory effect by thermal change.…”

Section: Introductionmentioning

confidence: 99%

Shape Memory Behavior of Ni-Mn-Ga Sputtered Films under a Magnetic Field

et al. 2003

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The shape memory behavior under the magnetic field up to 5 T was observed in Ni-Mn-Ga sputtered films. The sputtered films were heattreated at 1073 K for 36 ks for homogenization and aged at 673 K for 14.4 and 56.7 ks in a constraint condition. The martensitic transformation temperatures and Curie temperature of the obtained films were higher than room temperature. The martensitic transformation temperatures increased under a magnetic field. Furthermore, a shape memory effect was observed by increasing and decreasing of the magnetic field.

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“…3) These films exhibited the shape memory effect by change of temperature 4) and magnetic field. 5) The addition of ferromagnetic 3d transition metal such as iron, cobalt and so on in the Ni-Mn-Ga alloy will be very effective for the improvement of shape memory properties induced by the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cobalt Addition on Shape Memory Properties of Ferromagnetic Ni-Mn-Ga Sputtered Films

et al. 2004

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Effect of adding cobalt on the shape memory properties of Ni-Mn-Ga sputtered films was investigated. It was found that the films containing cobalt less than 5.1 mol% has a single phase and those with more than 6.8 mol%Co has two phases. The Curie temperature increased and the saturation magnetization decreased with increasing cobalt content. These films exhibited one way shape memory effect. The shape recovery start temperature increased and the temperature range of shape change broadened with increasing cobalt content.

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Shape Memory Effect of Sputtered Ni-rich Ni<SUB>2</SUB>MnGa Alloy Films Aged in Constraint Condition

Cited by 23 publications

References 5 publications

Magnetic-Field Induced Two-Way Shape Memory Effect of Ferromagnetic Ni<SUB>2</SUB>MnGa Sputtered Films

Magnetic-Field Induced Two-Way Shape Memory Effect of Ferromagnetic Ni<SUB>2</SUB>MnGa Sputtered Films

Shape Memory Behavior of Ni-Mn-Ga Sputtered Films under a Magnetic Field

Effect of Cobalt Addition on Shape Memory Properties of Ferromagnetic Ni-Mn-Ga Sputtered Films

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