Structural Change in Ni-Fe-Ga Magnetic Shape Memory Alloys after Severe Plastic Deformation

Gurău, Gheorghe; Gurău, Carmela; Ţolea, Felicia; Sampath, V.

doi:10.3390/ma12121939

Cited by 13 publications

(5 citation statements)

References 17 publications

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“…Change of elemental composition of dendrites was also observed at crystallization of other alloys with SME. For instance, in [21] the elemental mapping using electron scanning microscope in Ni 52 Fe 20 Ga 26 Co 2 alloy revealed increase of iron and cobalt content in dendrite and decrease of gallium content compared to surrounding matrix. Similar result in terms of these elements change was also observed in [16].…”

Section: Changes Of Dendrites Elemental Compositionmentioning

confidence: 99%

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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: Changes Of Dendrites Elemental Compositionmentioning

confidence: 99%

“…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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“…Such alloys *Corresponding author: tel. : +86 15225916801; e-mail address: lyf16816800@163.com can be deposited on almost any conductive substrate and are mainly used as novel ferromagnetic memory materials in the electronics industry [14,15]. Furthermore, when the mass fraction of cobalt in Ni-Co alloy coatings is below 40 %, the coating has good corrosion resistance, high hardness, and good wear resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of duty cycle on properties of Ni-P-(sol) Al2O3 nanocomposite coatings prepared by pulse-assisted sol-gel method

Li¹,

Zhang²,

Zhang³

et al. 2023

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Ni-P-(sol)Al2O3 nanocomposite coatings were prepared on Q235 carbon steel substrates by pulse-assisted sol-gel method with duty cycles ranging from 20 to 90 %. The production, microstructural characterization, corrosion resistance, friction, and wear properties of Ni-P-(sol)Al2O3 nanocomposite coating were evaluated. The results show that when the duty cycle is 50 %, the surface quality and corrosion resistance of the composite coating are the best, the hardness is 559.6 HV, the corrosion rate is 2.433 mm y −1 , and the friction coefficient is 0.260. In this study, nano sol was used instead of traditional powder doping. The pulse-assisted sol-enhanced composite coating had good wear and corrosion resistance. This technique can effectively avoid the agglomeration of nanoparticles during the deposition of composite coatings while impacting and leveling the coating surface during the pulse interval to improve coating quality. Meanwhile, the highly dispersed sol saves time and energy consumption of mixed solution without dispersant or stabilizer.

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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

show abstract

Structural Change in Ni-Fe-Ga Magnetic Shape Memory Alloys after Severe Plastic Deformation

Cited by 13 publications

References 17 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

Effect of duty cycle on properties of Ni-P-(sol) Al2O3 nanocomposite coatings prepared by pulse-assisted sol-gel method

Образование дендритной структуры в кристаллах NiFeGaCo при выращивании способом Степанова

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