Physics of Thermoelastic Martensitic Transformation in High-Strength Single Crystals

Chumlyakov, Y.I.; Киреева, И. В.; Panchenko, E. Yu.; Timofeeva, Е. Е.; Kretinina, I. V.; Куц, О. А.

doi:10.4028/www.scientific.net/msfo.81-82.107

Cited by 11 publications

(20 citation statements)

References 83 publications

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“…It has been shown in [ 19 , 20 ] that thermoelastic MT begins when the alloy is overcooled by ΔT overc relative to the chemical equilibrium temperature T 0 of the austenite and martensite phases to a lower temperature M S .…”

Section: Thermodynamics Of Thermoelastic Martensitic Transformationsmentioning

confidence: 99%

Regularities in the Evolution of Thermoelastic Martensitic Transformations during Cooling/Heating in the Free State and under Load of Titanium Nickelide Alloyed with Niobium

Marchenko,

Klopotov,

Baigonakova

et al. 2023

Materials

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This article presents the results of studies of the features of the development of thermoelastic martensitic transformations during cooling/heating in the free state and under load of Ti50Ni49.7−XNbXMo0.3 alloys (X = 0.5, 1.0 and 1.5 at% Nb) with shape memory effects. Using X-ray diffraction analysis, it was found that all the alloys studied at room temperature contained a multiphase mixture consisting of intermetallic compounds with the TiNi (B2, B19′), Ni56Ti29Nb15, and Ti2Ni compositions. Scanning electron microscopy was used to study the microstructure of TiNi (Nb,Mo) alloys and it was found that the distribution of fine Ni56Ti29Nb15 particles in the matrix depends significantly on the concentration of the alloying element. A correlation was established between changes in the structural-phase state in TiNi (Nb,Mo) alloys and the occurrence of the B2↔B19′ martensitic transition in the free state and under load. Based on physical and mechanical studies, the temperature ranges of the martensitic transformations (MT) in the free state and under load were established. Based on the thermodynamic description of the MT and the analysis of the characteristic temperatures of the MT, it was found that the MT mechanism is strongly dependent on the concentration of the alloying element.

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Section: Thermodynamics Of Thermoelastic Martensitic Transformationsmentioning

confidence: 99%

Regularities in the Evolution of Thermoelastic Martensitic Transformations during Cooling/Heating in the Free State and under Load of Titanium Nickelide Alloyed with Niobium

Marchenko,

Klopotov,

Baigonakova

et al. 2023

Materials

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“…Meanwhile, the half Heusler alloys show good TE performance and can be synthesized in the laboratory 23‐25 . Numerous studies suggest that Heusler alloys have spectacular TE features such as tunable lattice thermal conductivity (LTC) ( κ ι ), large Seebeck coefficient, and high TE performance 26‐30 .…”

Section: Introductionmentioning

confidence: 99%

Phonon phase stability, structural, mechanical, electronic, and thermoelectric properties of two new semiconducting quaternary Heusler alloys CoCuZrZ (Z = Ge and Sn)

Mushtaq¹,

Sattar

Dar³

2020

Int J Energy Res

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For meeting the energy demand, the development of new and novel thermoelectric (TE) materials for power generation is very vital. In this draft, we have theoretically investigated two new quaternary CoCuZrZ (Z = Ge and Sn) Heusler alloys for their structural, mechanical, electronic, and TE properties. In the energy minimization process, the alloys are found to be non-magnetic in the ground state. Based on calculated phonon dispersion curves, formation energy, and elastic constants, we propose that both CoCuZrGe and CoCuZrSn are stable. Furthermore, the mechanical properties indicate that CoCuZrGe (CoCuZrSn) has a brittle (ductile) nature. The electronic properties examined in Perdew-Burke-Ernzerhof (PBE), PBEsol, and modified Becke-Johnson (mBJ) potential, all predict that reported systems are narrow-gap semiconductors (SCs). In addition, the temperature dependent TE properties have been studied by calculating the electronic thermal conductivity (κ), Seebeck coefficient (S), power factor (PF) and electrical conductivity (σ/τ). The obtained positive value of S conveys the materials as p-type SCs, with a maximum value of 26.2 μV/K for CoCuZrGe and 28 μV/K for CoCuZrSn. The σ/τ, κ, and PF show increasing trends with rising temperature. The PF is found to be 1.55 × 10 12 WK −2 m −1 s −1 for CoCuZrGe and 1.38 × 10 12 WK −2 m −1 s −1 for CoCuZrSn. The proposed semiconducting Heusler alloys may receive attention for a range of TE and spintronic applications. K E Y W O R D S first-principles calculations, quaternary Heusler alloys, semiconductors, thermoelectric properties How to cite this article: Mushtaq M, Sattar MA, Dar SA. Phonon phase stability, structural, mechanical, electronic, and thermoelectric properties of two new semiconducting quaternary Heusler alloys CoCuZrZ (Z = Ge and Sn). Int

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“…В монокристаллах TiNi обеспечить высокий уровень прочностных свойств можно, во-первых, за счет выбора высокопрочной [001]-ориентации, в которой фактор Шмида равен нулю (m = 0) для действующих систем скольжения a 100 {011} в B2-фазе [3]. Во-вторых, для упрочнения богатых никелем двойных сплавов TiNi обычно используют старение при 673−823 K [3][4][5] Изменение температуры M s при МП в состоянии с наноразмерными частицами по сравнению с таковой для однофазного состояния может быть записано как [8,9]: упругой энергии, поскольку сами не испытывают МП и деформируются только упруго при развитии превращения, что приводит к возникновению внутренних упругих полей напряжений σ i . Влияние этого фактора учтено во втором слагаемом (1).…”

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“…Упрочнение высокотемпературной фазы в состаренных кристаллах приводит к значительному увеличению интервала развития СЭ T SE -в 2.5 раза по сравнению с закаленными кристаллами. В закаленных монокристаллах СЭ реализуется при температурах от T SE1 = 263 K до T SE2 = 323 K, тогда как после старения СЭ наблюдается при температурах от T SE1 = 253 K до T SE2 = 423 K. Интервал развития СЭ T SE в состаренных при 573 K монокристаллах Ti−50.6 at.% Ni является одним из самых широких среди сплавов TiNi [1,3,5].…”

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“…B2-фазы в моноклинный B19 ′ -мартенсит[4,5]. Электронно-микроскопические исследования позволили обнаружить в состаренных монокристаллах наноразмерные (d < 10 nm) частицы Ti 3 Ni 4 , характерные рефлексы типа 1/7 321 B2[3,5] от которых присутствуют на микродифракционных картинах (рис. 2, а).…”

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Влияние низкотемпературной термообработки на развитие сверхэластичности в монокристаллах Ti-50.6 at.% Ni

Timofeeva¹,

Суриков²,

Tagiltsev³

et al. 2019

Письма В Журнал Технической Физики

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As a result of low-temperature aging at 573 K for 1.5 h of Ti–50.6 at% Ni [001]-oriented single crystals quenched from 1253 K, a high-strength state is obtained due to the precipitation of Ti_3Ni_4 nanoscale particles ( d < 10 nm). The aging leads to the development of the B 2– B 19' martensitic transformation through an intermediate R phase, a reduction in the B 19' martensite formation temperatures by 40–60 K, an increase in the strength properties of the B 2 phase from 730 to 2100 MPa, and an extension of the superelasticity interval Δ T _SE in compression from Δ T _SE = 60 to 170 K (compared to quenched crystals).

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Physics of Thermoelastic Martensitic Transformation in High-Strength Single Crystals

Cited by 11 publications

References 83 publications

Regularities in the Evolution of Thermoelastic Martensitic Transformations during Cooling/Heating in the Free State and under Load of Titanium Nickelide Alloyed with Niobium

Regularities in the Evolution of Thermoelastic Martensitic Transformations during Cooling/Heating in the Free State and under Load of Titanium Nickelide Alloyed with Niobium

Phonon phase stability, structural, mechanical, electronic, and thermoelectric properties of two new semiconducting quaternary Heusler alloys CoCuZrZ (Z = Ge and Sn)

Влияние низкотемпературной термообработки на развитие сверхэластичности в монокристаллах Ti-50.6 at.% Ni

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Physics of Thermoelastic Martensitic Transformation in High-Strength Single Crystals

Cited by 11 publications

References 83 publications

Regularities in the Evolution of Thermoelastic Martensitic Transformations during Cooling/Heating in the Free State and under Load of Titanium Nickelide Alloyed with Niobium

Regularities in the Evolution of Thermoelastic Martensitic Transformations during Cooling/Heating in the Free State and under Load of Titanium Nickelide Alloyed with Niobium

Phonon phase stability, structural, mechanical, electronic, and thermoelectric properties of two new semiconducting quaternary Heusler alloys CoCuZrZ (Z = Ge and Sn)

Влияние низкотемпературной термообработки на развитие сверхэластичности в монокристаллах Ti-50.6 at.&#37; Ni

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Влияние низкотемпературной термообработки на развитие сверхэластичности в монокристаллах Ti-50.6 at.% Ni