Composition dependence of magnetic field-induced martensitic transformations in FeNi alloys

Kakeshita, Tomoyuki; Shimizu, K.; Funada, S.; Date, Muneyuki

doi:10.1016/0001-6160(85)90039-2

Cited by 103 publications

(54 citation statements)

References 10 publications

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“…The obtained value is comparable to that estimated for ferromagnetic Ni-Mn-Ga, but is considerably smaller than the value (ϳ0.1 K/kOe) reported for ferrous martensitic alloys. 34 Consistently, it has been shown that application of a magnetic field does not significantly modify the phonon branches in Ni-Mn-Ga. 35 At this point, it is worth noticing that the strong influence of ageing on the entropy difference between ␤ and M phases may not be related to an increase in the magnetic contribution to the entropy. This effect must be simply ascribed to the fact that Mn-rich regions do not transform martensitically.…”

Section: Discussionmentioning

confidence: 82%

Martensitic transition and magnetoresistance in a Cu-Al-Mn shape-memory alloy: Influence of ageing

et al. 2002

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We have studied the effect of ageing within the miscibility gap on the electric, magnetic, and thermodynamic properties of a nonstoichiometric Heusler Cu-Al-Mn shape-memory alloy, which undergoes a martensitic transition from a bcc-based structure (␤ phase͒ towards a close-packed structure (M phase͒. Negative magnetoresistance that shows an almost linear dependence on the square of magnetization with different slopes in the M and ␤ phases was observed. This magnetoresistive effect has been associated with the existence of Mn-rich clusters with the Cu 2 AlMn structure. The effect of an applied magnetic field on the martensitic transition has also been studied. The entropy change between the ␤ and M phases shows negligible dependence on the magnetic field, but it decreases significantly with annealing time within the miscibility gap. Such a decrease is due to the increasing amount of Cu 2 MnAl-rich domains that do not transform martensitically.

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Section: Discussionmentioning

confidence: 82%

Martensitic transition and magnetoresistance in a Cu-Al-Mn shape-memory alloy: Influence of ageing

et al. 2002

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“…It is now well known that external forces, such as uniaxial stress and magnetic field, much influence on martensitic transformations in the transformation temperature and the crystal structure, amount and morphology of the product martensites(1)- (3). Therefore, to clarify the influence of external forces is very important in order to understand the thermodynamics, kinetics and crystallography of martensitic transformations.…”

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confidence: 99%

Effect of Hydrostatic Pressure on Martensitic Transformations in Fe–Ni and Fe–Ni–C Alloys

et al. 1988

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Effects of hydrostatic pressure on martensitic transformations in Fe-29.9Ni and Fe-24.6Ni-1.8C (at%) alloys have been investigated by means of electrical resistivity and magnetization measurements and optical microscopy under a pressure of up to 1.5 GPa. As a result, the followings were found:Transformation temperatures under hydrostatic pressure, M's, shift from that under no pressure, Ms, Ni alloy and the non-Invar Fe-Ni-C alloy. The amount of the martensites induced at M's decreases with increasing hydrostatic pressure. Morphology of the hydrostatic pressure-induced martensites is the same as that of the thermally-induced ones irrespective of the formation temperature. A thermodynamical analysis for the hydrostatic pressure dependence of the transformation temperature shows that other effects should be taken into consideration besides the effect that the volume expansion associated with the martensitic transformation is opposed to hydrostatic pressure as has previously been proposed.

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“…In the former case the most prominent effect is the considerable change AT M (> 2K/kOe) of the transition temperature with applied field [9]. This change is mainly accounted for by the difference AM in the magnetic moment of the high and low temperature phases [10].…”

Section: Discussionmentioning

confidence: 96%

Effect of a magnetic field on the martensitic transition of Cu-Al-Mn alloys

et al. 2001

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Abstract:We study the effect of a magnetic field on tie martensitic transition of a Cu-AlMn shape memory alloy. We present resistance measurements through the martensitic transition under applied magnetic fields ranging from 0 to 50 kOe. Results show that while the onset of the transformation is only slightly affected by the magnetic field, the extension in temperature of the transition is significantly reduced upon increasing the field. This finding reflects the existence of magnetoelastic coupling at a mesoscopic scale between magnetic and structural domains.

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Composition dependence of magnetic field-induced martensitic transformations in FeNi alloys

Cited by 103 publications

References 10 publications

Martensitic transition and magnetoresistance in a Cu-Al-Mn shape-memory alloy: Influence of ageing

Martensitic transition and magnetoresistance in a Cu-Al-Mn shape-memory alloy: Influence of ageing

Effect of Hydrostatic Pressure on Martensitic Transformations in Fe–Ni and Fe–Ni–C Alloys

Effect of a magnetic field on the martensitic transition of Cu-Al-Mn alloys

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Composition dependence of magnetic field-induced martensitic transformations in FeNi alloys

Cited by 103 publications

References 10 publications

Martensitic transition and magnetoresistance in a Cu-Al-Mn shape-memory alloy: Influence of ageing

Martensitic transition and magnetoresistance in a Cu-Al-Mn shape-memory alloy: Influence of ageing

Effect of Hydrostatic Pressure on Martensitic Transformations in Fe&ndash;Ni and Fe&ndash;Ni&ndash;C Alloys

Effect of a magnetic field on the martensitic transition of Cu-Al-Mn alloys

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Effect of Hydrostatic Pressure on Martensitic Transformations in Fe–Ni and Fe–Ni–C Alloys