Thermoelastic FCC-FCT martensitic transformation in FePd alloy

Sohmura, Taiji; Oshima, Ryuichiro; Fujita, Francisco Eiichi

doi:10.1016/0036-9748(80)90304-x

Cited by 158 publications

(48 citation statements)

References 3 publications

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“…9) In an attempt to investigate whether such thermoelastic martensitic transformation accompanying SM effects also occurs in the present annealed Fe-Pd films, in-situ observation of crystal structures was performed during thermal cycling between RT and 90 C using an X-ray diffraction technique. Here, the XRD apparatus used was equipped with a temperature-control specimen holder, and the temperature of specimen surface was monitored by a copper-constantan thermocouple and controlled within AE1 C during measurement.…”

Section: Structure and Morphology Of Heat-treated Filmsmentioning

confidence: 99%

“…Fe-Pd alloy system is known to show a thermoelastic fcc-to-fct martensitic transformation in alloys near Fe-30 at%Pd and this transformation accompanies with SM effects in bulk forms. 5,9) Because the martensite phase is ferromagnetic, magnetic-field-induced SM effects can be expected, suggesting fast actuation response, compared with conventional SM alloys. Recently Ni 2 MnGa single crystal showed 6% strain when a magnetic field of about 400 kA/m is applied.…”

Section: Introductionmentioning

confidence: 99%

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Fe-Pd Ferromagnetic Shape Memory Alloy Thin Films Made By Dual Source DC Magnetron Sputtering

Inoue

Fujita

et al. 2003

Mater. Trans.

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Fe-Pd films have been deposited onto fused quartz substrates using a dual source dc magnetron sputtering apparatus, equipped with two independent targets of pure Fe and Pd. The Pd content of deposited films can be controlled with an accuracy of 1 at%Pd by varying the power for the Pd target at constant power for the Fe target. Fe-Pd films containing about 29 at%Pd show a fct structure after annealing at 900 C followed by quenching into iced water. These films underwent a thermoelastic fcc-to-fct martensitic transformation and the fct-phase region, where the fct phase is present at room temperature in the annealed films, has a tendency of shifting toward higher Pd content with increasing film thickness. This thickness effect is attributed to the difference in internal stress created during annealing. The martensite start temperature (M s ) of films containing 28.5-30.0 at%Pd was higher than room temperature, and it became lower with increasing Pd content. When Fe-30 at%Pd films were separated from the quartz substrate, they showed shape memory behavior upon heating after deformation.

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Section: Structure and Morphology Of Heat-treated Filmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fe-Pd Ferromagnetic Shape Memory Alloy Thin Films Made By Dual Source DC Magnetron Sputtering

Inoue

Fujita

et al. 2003

Mater. Trans.

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“…9) Relation between the alloy composition and martensitic transformation temperature has been determined by Sugiyama et al…”

Section: Introductionmentioning

confidence: 99%

Effect of Co and Ni on Martensitic Transformation and Magnetic Properties in Fe-Pd Ferromagnetic Shape Memory Alloys

et al. 2003

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Effects of Co and Ni addition on fcc-fct transformation temperature and magnetic properties have been investigated for Fe-Pd ferromagnetic shape memory alloys. The addition of Co shifts the fcc-fct transformation temperature slightly higher while the Ni addition shifts it lower. The results suggest that the relative stability between fcc and fct phases is significantly affected by the electronic structure. Saturation magnetization values for Fe-Pd-Co and Fe-Pd-Ni were found to be slightly higher than those for binary Fe-Pd.

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“…Concerning the Fe-Pd system, the face centered tetragonal (FCT) martensitic phase allows the magnetic shape memory effect by reorientation of martensite variants via twin boundary motion. The FCT martensite can be obtained when cooling face centered cubic (FCC) austentite through the MT in samples which were quenched in iced water after an annealing at 1173 K [3][4][5]. This structural transformation from FCC to FCT only takes place in a very narrow compositional range (29 < at% Pd < 32) and the transformation temperatures lie typically below room temperature (RT) [6,7].…”

Section: Introductionmentioning

confidence: 99%

Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn

et al. 2018

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The appearance of BCT martensite in Fe-Pd-based ferromagnetic shape memory alloys, which develops at lower temperatures than the thermoelastic martensitic transition, deteriorates the shape memory properties. In a previous work performed in Fe 70 Pd 30 , it was shown that a reduction in defects density reduces the non thermoelastic FCT-BCT transformation temperature. In the present work, the influence of quenched-indefects upon the intensity and temperature of the thermoelastic martensitic (FCC-FCT) and the non thermoelastic (FCT-BCT) transitions in Fe-Pd doped with Co and Mn is studied. Differential scanning calorimetric and mechanical spectroscopy studies demonstrate that a reduction in the dislocation density the stability range of the FCC-FCT reversible transformation in Fe 67 Pd 30 Co 3 and Fe 66.8 Pd 30.7 Mn 2.5 ferromagnetic shape memory alloys.

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Thermoelastic FCC-FCT martensitic transformation in FePd alloy

Cited by 158 publications

References 3 publications

Fe-Pd Ferromagnetic Shape Memory Alloy Thin Films Made By Dual Source DC Magnetron Sputtering

Fe-Pd Ferromagnetic Shape Memory Alloy Thin Films Made By Dual Source DC Magnetron Sputtering

Effect of Co and Ni on Martensitic Transformation and Magnetic Properties in Fe-Pd Ferromagnetic Shape Memory Alloys

Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn

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