Giant magnetic field induced strain in ferromagnetic shape memory alloys and its condition

Fukuda, Takashi; Kakeshita, Tomoyuki

doi:10.1179/174328408x302558

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…The occurrence of giant reversible magnetic deformation in a magnetic field observed in these alloys is due to the rearrangement of twin martensitic variants under the action of an external magnetic field due to the strong magnetocrystalline anisotropy and high mobility of twin boundaries. Similar properties are also observed in alloys such as Ni2MnAl, Co2MnGa, Co2MnAl [159], Fe-Pd [160], Fe-Pt [161], Co-Ni-Ga [162], Co-Ni-Al [163], and some others.…”

Section: Smart Fillerssupporting

confidence: 71%

3D Printing Technologies for Fabrication of Magnetic Materials Based on Metal–Polymer Composites: A Review

Mazeeva,

Masaylo,

Razumov

et al. 2023

Materials

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Additive manufacturing is a very rapidly developing industrial field. It opens many possibilities for the fast fabrication of complex-shaped products and devices, including functional materials and smart structures. This paper presents an overview of polymer 3D printing technologies currently used to produce magnetic materials and devices based on them. Technologies such as filament-fused modeling (FDM), direct ink writing (DIW), stereolithography (SLA), and binder jetting (BJ) are discussed. Their technological features, such as the optimal concentration of the filler, the shape and size of the filler particles, printing modes, etc., are considered to obtain bulk products with a high degree of detail and with a high level of magnetic properties. The polymer 3D technologies are compared with conventional technologies for manufacturing polymer-bonded magnets and with metal 3D technologies. This paper shows prospective areas of application of 3D polymer technologies for fabricating the magnetic elements of complex shapes, such as shim elements with an optimized shape and topology; advanced transformer cores; sensors; and, in particular, the fabrication of soft robots with a fast response to magnetic stimuli and composites based on smart fillers.

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Section: Smart Fillerssupporting

confidence: 71%

3D Printing Technologies for Fabrication of Magnetic Materials Based on Metal–Polymer Composites: A Review

Mazeeva,

Masaylo,

Razumov

et al. 2023

Materials

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“…はパラメータである．導出の詳細は原著論文 (18) を参考していただきたい．また，この式を考慮すると，TTT 曲線にお合金の TTT 図 (26) (30) ．図11 Fe 3 Pt における電子状態密度(DOS)の軸比(c/a) 依存性 (32) ．フェルミエネルギー E F 直下にあるピークが正方晶ひずみを与えることにより 2 つに分離することで，系のエネルギーを低下させている．図12 Fe 31.2Pd(at)合金 (34) ならびに Fe 3 Pt (35) における応力 ひずみ曲線の温度依存性． ( 1 ) 西山善次マルテンサイト変態基本編，丸善，(1972).…”

Section:  はじめにunclassified

An Interpretation on Nucleation of Martensitic Transformation and Giant Elastic-like Strain and Critical Point in Some Iron-based Shape Memory Alloys

Kakeshita

2015

Materia Japan

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“…It is now well understood that magnetocrystalline anisotropy, twinning shear and twinning stress are important factors for realizing the rearrangement of variants. 5) Similar selection of variants was also found in an Fe-Pd alloy exhibiting a disorder-order transformation from the A1-type structure to the L1 0 -type structure by Oshima et al 6) and Tanaka et al 7) We also reported that a single variant of the ordered phase can be obtained in Co-50Pt 8) and Fe-55Pd 9) alloys by making two-step ordering heat-treatments: the first step was made under a magnetic field, and the second step was made under no magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Ordering Process and Variant Selection under Magnetic Field in L10-type Co–50Pt and Fe–55Pd Alloys

2009

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Selected formation of variants under magnetic field in a diffusional process has been investigated by using Co-50Pt (at%) and Fe-55Pd (at%) alloys exhibiting A1 (disorder)-L1 0 (order) transformations. A single variant of the ordered phase is obtained in these alloys by applying a magnetic field during the early stage of ordering. The lowest magnetic field required for obtaining the single variant is about 0.5 T for the Co-50Pt alloy, and 4 T for the Fe-55Pd alloy in the present heat-treatment conditions. Such a difference could be due to the relation between nucleation barrier for the formation of the ordered phase and magnetocrystalline anisotropy at the nucleation stage.KEY WORDS: cobalt-platinum alloy; iron-palladium alloy; Curie temperature; single variant; magnetocrystalline anisotropy.Y-, Z-variants, respectively, and these fractions as f x , f y , and f z . The fraction of each variant was determined by magnetization measurements using a SQUID magnetometer. When the specimen is highly ordered, the fraction will be obtained by using the relation f x ϭM x 0 /M s , f y ϭM y 0 /M s , f z ϭM z 0 /M s ; where M s is the spontaneous magnetization; M x 0 , M y 0 , M z 0 , are the magnetization at zero field extrapolated from the high field region measured along the X-, Y-, Z-directions, respectively. Results Disorder-Order Transformation under Zero Magnetic Field and Magnetic PropertiesIn this section, we will show the ordering process in Co-50Pt and Fe-55Pd alloys in the absence of magnetic field and determine the Curie temperatures of their disorder and order phases.First, time evolution of disorder-order transformation has been examined by measuring electrical resistivity at 273 K after performing an isothermal heat-treatment at different ordering temperatures followed by quenching into ice-water. The result is shown in Fig. 1, where the resistivity is normalized by the value of the as-quenched specimen, r A.Q. at 273 K. In the case of the Co-50Pt alloy, the resistivity saturates within 3 h by the heat-treatment at 1 023 K, while not within 200 h by the heat-treatment at 973 K, 873 K, and 773 K. These results imply that the ordering process is the fastest at 1 023 K and slowest at 773 K in the examined temperature range. Similar results were reported by Newkirk et al. 10) in a Co-48Pt (at%) alloy. In the case of Fe-55Pd alloy, the resistivity saturates within 3 h by the heat-treatment at 873 K, within 21 h at 773 K, while not within 163 h by heat-treatment at 673 K.Second, we examined the Curie temperature of the disordered phase by electrical resistivity measurement. The measurements were made by heating the disordered specimen from room temperature with a heating rate of 100 K/min, and the result is shown in Fig. 2 by solid curves. In the case of the Co-50Pt alloy (a), the resistivity heating curve exhibits a bending as indicated by an arrow at about 850 K. We can interpret this temperature as the Curie temperature of the disordered phase, T c (d) , considering the same bending appears at Curie tempera...

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Giant magnetic field induced strain in ferromagnetic shape memory alloys and its condition

Cited by 8 publications

References 20 publications

3D Printing Technologies for Fabrication of Magnetic Materials Based on Metal–Polymer Composites: A Review

3D Printing Technologies for Fabrication of Magnetic Materials Based on Metal–Polymer Composites: A Review

An Interpretation on Nucleation of Martensitic Transformation and Giant Elastic-like Strain and Critical Point in Some Iron-based Shape Memory Alloys

Ordering Process and Variant Selection under Magnetic Field in L10-type Co–50Pt and Fe–55Pd Alloys

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