Martensitic transformations and magnetic properties of nonstoichiometric alloys of the Ni-Mn-In system

Kaletina, Yu. V.; Gerasimov, E. G.

doi:10.1134/s1063783414080101

Cited by 19 publications

(8 citation statements)

References 11 publications

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“…Besides, except for Ga, the phase diagrams for other ternary alloy systems generally show a T C,P much higher than T C,M , as shown by Sutou et al [13]. This can also be found in other ternary Ni 89−x Mn x In 11 [43] Fig. 1 reveals that the two systems have a similar behavior for the …”

Section: Introductionsupporting

confidence: 57%

Thermodynamics and Kinetics of Martensitic Transformation in Ni-Mn-based Magnetic Shape Memory Alloys

Kainuma

Kihara

et al. 2015

MATEC Web of Conferences

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Abstract. We herein present a review of recent thermodynamic and kinetic studies on Ni-Mn-based magnetic shape memory alloys along with some new data supporting the kinetic discussion. Magnetic phase diagrams and Clausius-Clapeyron relationships are mainly discussed for Ni-Mn-Ga and Ni-Mn-In systems. For the kinetics, a phenomenological model based on Seeger's model is used to describe the temperature dependence of magnetic field hysteresis, as well as the change of hysteresis under different sweeping rates of magnetic fields.

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Section: Introductionsupporting

confidence: 57%

Thermodynamics and Kinetics of Martensitic Transformation in Ni-Mn-based Magnetic Shape Memory Alloys

Kainuma

Kihara

et al. 2015

MATEC Web of Conferences

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“…При охлаждении в сплаве наблюдается магнитный пе-реход высокотемпературной L2 1 фазы из парамагнит-ного в ферромагнитное состояние, температура Кюри Т СА ≈ 310 K [11]. При дальнейшем охлаждении при тем-пературе Т М ≈ 300 K происходит мартенситное пре-вращение.…”

Section: результаты и их обсуждениеunclassified

“…При дальнейшем охлаждении при тем-пературе Т М ≈ 300 K происходит мартенситное пре-вращение. Следует отметить, что в сплаве Ni 47 11 . В спектре с участ-ка границы зерна, отмеченного крестом на рис.…”

Section: результаты и их обсуждениеunclassified

“…Исследовано влияние разных режимов термоцикличе-ской обработки на особенности структуры и микро-твердость сплава Ni 47 Mn 42 In 11 . Показано, что многократ-ные циклы нагрева в область высокотемпературной L2 1 фазы и охлаждения до низких температур влияют на структуру, уровень напряжений и микротвердость сплава Ni 47 Mn 42 In 11 .…”

Section: заключениеunclassified

“…Исследовано влияние различных режимов термоциклической обработки на микроструктуру и свойства ферромаг-нитного сплава Ni 47 Mn 42 In 11 . Режимы термоциклической обработки отличались температурой нагрева (363 -573 K) и временем выдержки, температура охлаждения для всех режимов -77 К. Количество циклов нагрев-охлаждение варьировали от 1 до 30.…”

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Structure and microhardness of the three-component Ni-Mn-In alloy after different modes of thermal cycling treatment

Kaletina¹,

Greshnova²,

Калетин³

2017

LoM

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The influence of various modes of thermal cycling treatment on the microstructure and properties of ferromagnetic alloy Ni 47 Mn 42 In 11 was studied. The modes of thermal cycling treatment differed in the heating temperature (363 -573 K) and holding time, the cooling temperature being 77 K for all modes. The number of heating-cooling cycles was varied from 1 to 30. The microstructure of Ni 47 Mn 42 In 11 alloy in the initial state and after thermal cycling treatment was studied by optical metallography and scanning electron microscopy. A magnetic structural transition is observed in the alloy during cooling from the high-temperature region at a temperature about Т ≈ 300 -310 K. In the initial state, the structure of the alloy has two phases and consists of the L2 1 phase and martensite. The martensite crystals are grouped in packets of 80 -150 μm width, which are misoriented relative to each other by angles of 60 or 120 degrees. The boundaries of the coarse grains are predominantly smooth in the initial state. Structural studies showed that after thermal cycling treatment the martensitic crystals reached the grain boundaries and deformed them, and boundaries of a serrate form appeared. Micro-X-ray spectral analysis did not reveal precipitates of the second phases along the grain boundaries after thermal cycling treatment. The stress level was estimated after annealing and subsequent thermal cycling treatment by electron back scattered diffraction method. It was shown that with an increase in the number of heating-cooling cycles the stress level in the material increased. After the thermal cycling treatment the microhardness of the investigated alloy increased. It was shown that there was no unequivocal dependence of the microhardness value on the temperature of heating upon the thermocycling processes. The maximum increment in microhardness was detected after 20 cycles of treatment by in the 473 K ↔ 77 K mode.Keywords: ferromagnetic alloy, structure, martensite transformation, thermal cycling, microhardness. In 11 в исходном состоянии и после термоциклической обработки. При охлаждении из высокотемпературной области в сплаве при Т ≈ 300 -310 K наблюдается магнитоструктурный переход. В исход-ном состоянии структура сплава двухфазная, состоит из L2 1 -фазы и мартенсита. Кристаллы мартенсита сгруппи-рованы в пакеты шириной 80 -150 мкм, которые разориентированы относительно друг друга на угол 60 или 120 градусов. В исходном состоянии границы крупных зерен преимущественно ровные. Структурные исследования показали, что после термоциклической обработки мартенситные кристаллы при достижении границ зерен часто деформируют их, и появляются границы зубчатой формы. Микрорентгеноспектральный анализ после термоцикли-ческой обработки не выявил выделений вторых фаз по границам зерен. Методом дифракции обратно отраженных электронов была проведена оценка уровня напряжений после отжига и последующей термоциклической обработки. Показано, что с увеличением числа циклов нагрев-охлаждение уровень напряжений в материале возрастает. По...

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Microstructure, martensitic transformation kinetics, and magnetic properties of (Ni50Mn40In10)100−xCox melt-spun ribbons

Bekhouche,

Alleg,

Dadda

et al. 2024

J Therm Anal Calorim

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The effect of Co-doping on the structure, microstructure, martensitic phase transformation kinetics, and magnetic properties of the melt-spun (Ni50Mn40In10)1−xCox (x = 1, 2, and 3) Heusler ribbons, named hereafter Co1 (x = 1), Co2 (x = 2), and Co3 (x = 3), was assessed using X-ray diffraction, scanning electron microscope, energy-dispersive spectroscopy, X-ray fluorescence, differential scanning calorimetry, and vibrating sample magnetometer. The XRD results reveal the formation of a 14M martensite structure alongside the face-centered-cubic (fcc) γ phase. The crystallite size ranges between 50 and 98 nm for the 14M martensite and from 9 to 16 nm for the γ phase. The mass fraction of the γ phase lies between 36.4 and 44.2%. Co-doping affects the lattice parameters and the characteristic temperatures (martensite start, martensite finish, austenite start, and austenite finish). The calculated activation energy values for the non-isothermal martensitic transformation kinetics are 257 kJ mol−1 and 135.6 kJ mol−1 for the Co1 and Co2, respectively. The produced ribbons show a paramagnetic behavior. The variation in the coercivity can be related to the crystallite size and mass fraction of the γ phase. The produced ribbons exhibit an exchange bias at room temperature that decreases with increasing the Co content.

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Martensitic transformations and magnetic properties of nonstoichiometric alloys of the Ni-Mn-In system

Cited by 19 publications

References 11 publications

Thermodynamics and Kinetics of Martensitic Transformation in Ni-Mn-based Magnetic Shape Memory Alloys

Thermodynamics and Kinetics of Martensitic Transformation in Ni-Mn-based Magnetic Shape Memory Alloys

Structure and microhardness of the three-component Ni-Mn-In alloy after different modes of thermal cycling treatment

Microstructure, martensitic transformation kinetics, and magnetic properties of (Ni50Mn40In10)100−xCox melt-spun ribbons

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