Effect of Spontaneous Volume Magnetostriction on Martensitic Transformation in an Fe-29.9 at%Ni Invar Alloy under Hydrostatic Pressures

Kakeshita, Tomoyuki; Shimizu, K.; Tanaka, R.; Nakamichi, Sei; Endo, S.; Ono, F.

doi:10.2320/matertrans1989.32.1115

Cited by 21 publications

(10 citation statements)

References 11 publications

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“…We speculated 23) that the disagreement for Invar alloys was due to the existence of spontaneous volume magnetostriction, ω s , which leads to the Invar effect and directly influences the volume change associated with the martensitic transformations.…”

Section: The Effect Of Hydrostatic Pressure On Martensitic Transformamentioning

confidence: 99%

“…Considering the Invar nature on martensitic transformation under hydrostatic pressure mentioned above, we derived the following equation 23) including a term due to ω s to estimate the hydrostatic pressure dependence of transformation start temperatures, by referring to Patel & Cohen's equation, (M s , 0)), due to a decrease in ω s caused by applied hydrostatic pressure.…”

Section: The Effect Of Hydrostatic Pressure On Martensitic Transformamentioning

confidence: 99%

“…23) In the calculation, temperature and hydrostatic pressures dependences of ω s and V are obtained in the present study 23) and other physical quantities involved in the equation were set to be the measured in the previous studies.…”

Section: The Effect Of Hydrostatic Pressure On Martensitic Transformamentioning

confidence: 99%

“…Magnetic field and hydrostatic pressure are important in such external fields because there exist some significant differences in magnetic moment and atomic volume between the parent and martensitic states. 3,4) In fact, many reseachers 1,[3][4][5][6][7][8][9] have examined the effects of magnetic field and hydrostatic pressure on martensitic transformations. We also examined them systematically [4][5][6][7][8] and found many interesting phenomena on them.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2002

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Effects of magnetic field and hydrostatic pressure on martensitic transformation have been examined by using Fe-Pt, Cu-Al-Ni, Ni 2 MnGa and Fe-Pd shape memory alloys and Fe-Ni alloys. Following results are obtained; (i) in Fe-Pt, Cu-Al-Ni and Fe-Ni alloys, the experimental magnetic field and/or hydrostatic pressure dependence of martensitic transformation start temperature, M s , is in good agreement with the dependence calculated by the equation previously proposed by our group to evaluate the relation between M s and magnetic field and hydrostatic pressure. (ii) Giant magnetostriction has been observed in the martensite state of Ni 2 MnGa and Fe-31.2 at%Pd ferromagnetic shape memory alloy single crystals. The values (contraction of 3.8% for Ni 2 MnGa and expansion of about 3% for Fe-31.2 at%Pd) are nearly the same values as can be expected from the perfect conversion of variants, i.e., variants are converted to preferable variants whose magnetocrystalline anisotropy energy is minimum among them under the magnetic field.

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Section: The Effect Of Hydrostatic Pressure On Martensitic Transformamentioning

confidence: 99%

Section: The Effect Of Hydrostatic Pressure On Martensitic Transformamentioning

confidence: 99%

Section: The Effect Of Hydrostatic Pressure On Martensitic Transformamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2002

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“…Details of the ultra high magnetic field instrument have been reported elsewhere [8]. The specimens for electrical resistivity measurements under hydrostatic pressure were three Invar FeNi alloys [9], disorder and order Fe-Pt Invar alloys [10] and non-lnvar Fe-Ni-C [11], Cu-A1-Ni [12] and Ti-Ni [13] alloys. The hydrostatic pressures used in the measurements were generated by a piston cylinder type instrument, in which kerosene and transformer oil in a teflon capsule were used as liquid pressure medium, and the applicable maximum pressure was 2.3 GPa.…”

Section: Methodsmentioning

confidence: 99%

Effects of magnetic field and hydrostatic pressure on martensitic transformation

Kakeshita

Saburi

1997

Metals and Materials

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Effects of magnetic field and hydrostatic pressure on martensitic transformations in some ferrous and nonferrous alloys have been studied. The studies clarified the effects of magnetic field and hydrostatic pressure on martensitic transformation start temperature, magnetoelastic martensitic transformation, morphology of martensites and transformation kinetics of athermal and isothermal transformations. That is, transformation start temperatures of all the ferrous alloys examined increase with increasing magnetic field, but those of non-ferrous, such as Ti-Ni and Cu-A1-Ni shape memory alloys, are not affected. On the other hand, transformation start temperature decreases with increasing hydrostatic pressure in some ferrous alloys, but increases in Cu-A1-Ni alloys. The magnetic field and hydrostatic pressure dependences of the martensitic start temperature are in good agreement with those calculated by the equations proposed by our group. In the work on the Fe-Ni-Co-Ti alloy, we found that magnetoelastic martensitic transformation appear. In addition, several martensite plates grow nearly parallel to the direction of applied magnetic field in the specimen of an Fe-Ni alloy single crystal. Moreover, we found that the isothermal process in an Fe-Ni-Mn alloy changes to the athermal one under magnetic field and the athermal process changes to the isothermal one under hydrostatic pressure. Based on the facts, a phenomenological theory is constructed, which unifies the two transformation processes.

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Influence of aging temperature on physical properties of a 40NiCrTiAl Elinvar alloy

Xu,

Weng,

Wang

et al. 2024

J Mater Sci

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Effect of Spontaneous Volume Magnetostriction on Martensitic Transformation in an Fe-29.9 at%Ni Invar Alloy under Hydrostatic Pressures

Cited by 21 publications

References 11 publications

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

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

Effects of magnetic field and hydrostatic pressure on martensitic transformation

Influence of aging temperature on physical properties of a 40NiCrTiAl Elinvar alloy

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