Ferromagnetic Shape Memory Materials: Underlying Physics and Practical Importance

Chernenko, V.A.; Besseghini, S.; Müllner, Peter; Kostorz, G.; Schreuer, J.; Krupa, M. M.

doi:10.1166/sl.2007.085

Cited by 14 publications

(11 citation statements)

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“…Ferromagnetic shape memory alloys (FSMAs) are well known for their giant magnetic-field induced strain (MFIS), which make them potential candidates for applications such as actuators and sensors (Ullakko et al 1996;Chernenko et al 2007). It is evident from the literature that the FSMAs have ferromagnetic nature and undergo martensite transformation (Ullakko et al 1996;Mullner and Ullakko 1998;Mullner et al 2002;Chernenko et al 2007;Techapiesancharoenkij et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…It is evident from the literature that the FSMAs have ferromagnetic nature and undergo martensite transformation (Ullakko et al 1996;Mullner and Ullakko 1998;Mullner et al 2002;Chernenko et al 2007;Techapiesancharoenkij et al 2008). The phase transformation and energy dissipation through twin mechanism in Ni-Mn-Ga makes it a suitable candidate for dampers.…”

Section: Introductionmentioning

confidence: 99%

“…The phase transformation and energy dissipation through twin mechanism in Ni-Mn-Ga makes it a suitable candidate for dampers. There are lots of literature available for the structural, mechanical and magnetic studies for the NiMn-Ga FSMA (Segui et al 2004;Segui et al 2005;Chernenko et al 2007, Sanjay Singh et al 2010. The martensite transformations are the characteristics of NiMn-Ga that can be varied by changing the chemical compositions, which can lead to formation of a different group of alloys (Segui et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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Temperature dependent damping studies of Ni-Mn-Ga polymer composites

et al. 2011

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Mechanical properties of ferromagnetic shape memory alloy (FSMA) polyurethane (PU) polymer composites are studied using dynamic mechanical analysis (DMA) at different temperatures. The sample used in the study is Ni-Mn-Ga/PU polymer composite. DMA studies reveal that the mechanical modulus decreases, when the temperature increases. The peak in internal friction (tanδ) appears twice due to martensite transformation of the reinforced particles and glass transition of the polymer matrix. The strain is due to the motion of twin boundaries rather than the phase transformations. Twin boundary motion is found to be the root cause for the martensite-austenite transformation and vice versa, and leads to enhanced damping mechanism. Speculations on twin boundaries of this sample to show concrete evidence on change in internal friction (tanδ ) are still underway. This paper proposes that Ni-Mn-Ga/PU polymer composites can be used as efficient dampers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature dependent damping studies of Ni-Mn-Ga polymer composites

et al. 2011

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“…[1][2][3][4][5][6] Ni-Mn-Ga alloys show higher MFIS compared to the other commercially available magneto-strictive materials such as Terfenol-D. Higher frequency operation of Ni-Mn-Ga makes them superior to the conventional shape memory alloys (SMAs). The large field required to initiate the twin boundary motion depends on the sample size and microstructure.…”

Section: Introductionmentioning

confidence: 99%

Stress Wave Propagation in Ni–Mn–Ga Ferromagnetic Shape Memory Alloys

Pandi¹,

Chokkalingam²,

Mahendran³

2011

Jpn. J. Appl. Phys.

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Ni-Mn-Ga ferromagnetic shape memory alloys (FSMAs) are a prominent candidate for actuation application due to their large magnetic field induced strain (MFIS). MFIS in these alloys are mainly due to the twin variant reorientation. This can be achieved only above the magnetic threshold, which requires a large electromagnet. The higher threshold magnetic field for magnetic actuation can be reduced by the assistance of stress waves. The present work is focused on the stress wave propagation in Ni-Mn-Ga alloys. It has been observed that the stress amplitude is high in the frequency range 2 to 5 kHz and is found to be dependent on the input voltage supplied to the actuator which gives out stress wave. The advantage is that, in this frequency range, the threshold field for magnetic actuation can be reduced. It is noted that the stress amplitude is higher in the Ni-Mn-Ga polycrystal (456 mV) than the Ni-Mn-Ga single crystal (385 mV) for the 30 V input peak to peak voltage (V pp ). The finding of this work supports the Ni-Mn-Ga alloy polycrystals for actuation applications with the assistance of stress waves.

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“…Refs. [1][2][3][4]). Due to their large magnetic-field-induced shape deformation and reverse effect, these alloys are considered to be important for the development of advanced magnetomechanical actuators [5] and sensors [4], respectively.…”

Section: Introductionmentioning

confidence: 99%