Magnetic shape memory actuator performance

Suorsa, I.; Pagounis, E.; Ullakko, K.

doi:10.1016/j.jmmm.2003.12.1026

Cited by 62 publications

(35 citation statements)

References 5 publications

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“…There are numerous applications for FSMAs ranging from magnetically driven actuators to magnetic refrigeration. 2,3 The Ni-Mn-Ga alloy series is one such FM Heusler system that has garnered much interest. 4,5 This system features martensitic transformations from a high-T FM L2 1 austenite phase to a low-T paramagnetic modulated 10M, 14M, or L1 0 martensite phase depending on the composition.…”

Section: Introductionmentioning

confidence: 99%

Influence of annealing and phase decomposition on the magnetostructural transitions in Ni50Mn39Sn11

Yuhasz

Schlagel

Xing

et al. 2009

Journal of Applied Physics

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Magnetic and structural transitions in the Ni 50 Mn 50−x Sn x (x = 10-25) ferromagnetic shape memory alloys are currently of interest. As in Ni-Mn-Ga, these alloys feature high-temperature austenite and lowtemperature martensite phases, where the magnetic state is strongly composition dependent. To study the role of chemical ordering in fine-tuning their magnetostructural properties, they were first annealed for 4 weeks/ 1223 K to achieve structural and compositional homogeneity, and were then further annealed for 1 week ( ∼ 150 K below the reported B2 to L2 1 transition) at 773 K to increase the degree of chemical ordering. For x = 11, this anneal resulted in a dramatic change in the magnetic ordering temperature. Following the 1223 K anneal, the sample exhibited ferromagnetic ordering at 140 K. After the 773 K anneal, the ferromagnetic transition is at 350 K, a characteristic of the ferromagnetic austenite phase with 15<x<25. Consistent with the magnetization data, transmission electron microscopy examination confirms that the alloy decomposed into two phases with x = 20 and 1. From this result one can conclude that the martensitic transformation occurs only in those compositions where the single phase L2 1 has been retained in a metastable state on cooling. Magnetic and structural transitions in the Ni 50 Mn 50−x Sn x ͑x =10-25͒ ferromagnetic shape memory alloys are currently of interest. As in Ni-Mn-Ga, these alloys feature high-temperature austenite and low-temperature martensite phases, where the magnetic state is strongly composition dependent. To study the role of chemical ordering in fine-tuning their magnetostructural properties, they were first annealed for 4 weeks/1223 K to achieve structural and compositional homogeneity, and were then further annealed for 1 week ͑ϳ150 K below the reported B2 to L2 1 transition͒ at 773 K to increase the degree of chemical ordering. For x = 11, this anneal resulted in a dramatic change in the magnetic ordering temperature. Following the 1223 K anneal, the sample exhibited ferromagnetic ordering at 140 K. After the 773 K anneal, the ferromagnetic transition is at 350 K, a characteristic of the ferromagnetic austenite phase with 15Ͻ x Ͻ 25. Consistent with the magnetization data, transmission electron microscopy examination confirms that the alloy decomposed into two phases with x = 20 and 1. From this result one can conclude that the martensitic transformation occurs only in those compositions where the single phase L2 1 has been retained in a metastable state on cooling.

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Section: Introductionmentioning
confidence: 99%

Influence of annealing and phase decomposition on the magnetostructural transitions in Ni50Mn39Sn11
Yuhasz
¹
,
Schlagel
²
,
Xing
³

et al. 2009
Journal of Applied Physics
41
5
27
0
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“…43 Furthermore, some specific compositions of NiMnGa present the high transformation temperatures over the 200 C up to 400 C allowing the access to high temperature applications, which are forbidden for the most NiTi based alloys. Even if the addiction of Pt and Pd to NiTi has demonstrated the possibility to reach high transformation temperatures, similar to the NiMnGa, the high costs of added precious metals limit the application in less demanding sectors.…”

Section: Discussionmentioning
confidence: 99%

Design and Industrial Manufacturing of SMA Components
Stortiero
¹

2015
Shape Memory Alloy Engineering
0
0
0
0
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“…The majority use the simple principle described previously in Fig. 4 (a), [34,35,36] and some few others use in addition the Inchworm or stick and slip principles [37,38]. The descriptions and models presented in authors previous papers and summed up in the previous sections give a better understanding of MSMA behaviour.…”

Section: General Design Considerationsmentioning
confidence: 99%

Magnetic Shape Memory Alloys as smart materials for micro-positioning devices
Hubert
¹
,
Calchand
²
,
Gorrec
³

et al. 2012
AEM
31
0
16
0
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In the field of microrobotics, actuators based on smart materials are predominant because of very good precision, integration capabilities and high compactness. This paper presents the main characteristics of Magnetic Shape Memory Alloys as new candidates for the design of micromechatronic devices. The thermo-magneto-mechanical energy conversion process is first presented followed by the adequate modeling procedure required to design actuators. Finally, some actuators prototypes realized at the Femto-ST institute are presented, including a push-pull bidirectional actuator. Some results on the control and performances of these devices conclude the paper.

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Magnetic shape memory actuator performance

Cited by 62 publications

References 5 publications

Influence of annealing and phase decomposition on the magnetostructural transitions in Ni50Mn39Sn11

Influence of annealing and phase decomposition on the magnetostructural transitions in Ni50Mn39Sn11

Design and Industrial Manufacturing of SMA Components

Magnetic Shape Memory Alloys as smart materials for micro-positioning devices

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