Martensitic Transformation and Crystal Structure Characterization of Ni-Fe-Ga-Co Ferromagnetic Shape Memory Alloys

Jiang, Pengbo; Bai, Jing; Wei, Pu; Han, Shuang Ji; Yang, Mei; Teng, Fei; Wang, Xin Li; Zhao, Xiang

doi:10.4028/www.scientific.net/msf.879.2061

Cited by 4 publications

(2 citation statements)

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“…It should be noted, that dendritic structure formation is rather common phenomenon during crystallization of metal alloys based on iron and nickel [16][17][18][19][20][21]. Dendritesa structural defect of characteristic skeletal shape, consisting of a central branch (main axis) and side branches, perpendicular to it.…”

Section: Introductionmentioning

confidence: 99%

Formation of a dendrite structure in crystals NiFeGaCo alloy in the process of growing by the Stepanov method

Krymov

M.G.

et al. 2022

Physics of the Solid State

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The process of growing crystals of the NiFeGaCo alloy by the Stepanov method has been developed. It was found that the structural perfection is disturbed by the formation of dendrites, which are distributed inhomogeneously both along the length and in the cross sections of the crystals. The blocking effect of the dendrites on growth crystals of the martensite phase, which appears when the samples are cooled to the temperature of the transition of the crystal to the martensite state, is found. The elemental composition of dendritic formations was studied and it was shown that the iron content in the dendrite is approximately 30% higher, and the gallium content is 40% lower than in the matrix. Based on the modeling of heat transfer processes in the real growth zone, taking into account the experiments performed, recommendations were obtained for suppressing the formation of dendrites Keywords: Dendritic structure, shape memory alloys, Stepanov's method.

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Section: Introductionmentioning

confidence: 99%

Formation of a dendrite structure in crystals NiFeGaCo alloy in the process of growing by the Stepanov method

Krymov

M.G.

et al. 2022

Physics of the Solid State

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“…Надо заметить, что образование дендритной структуры -достаточно распространенное явление при кристаллизации металлических сплавов на основе железа и никеля [16][17][18][19][20][21]. Дендриты -это структурный дефект характерной скелетной формы, состоящий из центральной ветви (ось первого порядка) и перпендикулярных ей боковых ветвей.…”

Section: Introductionunclassified

Образование дендритной структуры в кристаллах NiFeGaCo при выращивании способом Степанова

Носов¹,

Крымов²,

Васильев³

et al. 2021

Физика Твердого Тела

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The process of growing crystals of the Ni-Fe-Ga-Co alloy by the Stepanov method has been developed. It was found that the structural perfection is disturbed by the formation of dendrites, which are distributed inhomogeneously both along the length and in the cross sections of the crystals. The blocking effect on the dendrites of crystals of the martensite phase, which appears when the samples are cooled to the temperature of the transition of the crystal to the martensite state, is found. The elemental composition of dendritic formations was studied and it was shown that the iron content in the dendrite is approximately 30% higher, and the gallium content is 40% lower than in the matrix. Based on the modeling of heat transfer processes in the real growth zone, taking into account the experiments performed, recommendations were obtained for suppressing the formation of dendrites

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Tailoring the performances of Ti-V-Al base shape memory alloys by defects engineering

Wang,

Liu,

et al. 2024

Journal of Vacuum Science &Amp; Technology A

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In the present study, various defects such as dislocations were controlled in Ti-V-Al-based shape memory alloy by thermomechanical treatment and introduction of interstitial oxygen (O) atom to optimize the performances. The results revealed that the Ti-V-Al-O shape memory alloys gradually evolved from α” martensite phase to the β parent phase with increasing annealing temperature. Moreover, the degree of lattice distortion can be tailored by changing annealing temperatures. Upon the annealing temperature reached 900 °C, masses of ω precipitates and a nano-sized ordered domain, characteristic of strain glass, can be found. As a result of suppression effect of multiple varieties of defects to the martensitic transformation, no obvious endothermic and exothermic peaks were observed in differential scanning calorimetry curves. The yield strength and maximum tensile fracture strength of the Ti-V-Al-O shape memory alloy increased with the increase of annealing temperatures. Meanwhile, Ti-V-Al-O shape memory alloys annealed at 900 °C possessed superior strain recovery characteristics and corrosion resistance. The excellent performances in Ti-V-Al-O shape memory alloys annealed at 900 °C can be attributed to the formation nanoscale nanodomain.

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Martensitic Transformation and Crystal Structure Characterization of Ni-Fe-Ga-Co Ferromagnetic Shape Memory Alloys

Cited by 4 publications

References 0 publications

Formation of a dendrite structure in crystals NiFeGaCo alloy in the process of growing by the Stepanov method

Formation of a dendrite structure in crystals NiFeGaCo alloy in the process of growing by the Stepanov method

Образование дендритной структуры в кристаллах NiFeGaCo при выращивании способом Степанова

Tailoring the performances of Ti-V-Al base shape memory alloys by defects engineering

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