Optimization of Strength‐Electrical Conductivity Properties in Al–2Fe Alloy by Severe Plastic Deformation and Heat Treatment

Medvedev, Andrey; Murashkin, M. Yu.; Enikeev, Nariman A.; Valiev, Ruslan Z.; Hodgson, Peter; Lapovok, Rimma

doi:10.1002/adem.201700867

Cited by 33 publications

(23 citation statements)

References 23 publications

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“…In reality; however, the effective conductivity was about 10% lower than the ideal theoretical value, and was in the range of 55% to 60% IACS. The low initial conductivity could be explained by the Fe high content in the solid solution and is in line with results published in [18].…”

Section: Electrical Conductivitysupporting

confidence: 92%

“…Further, several UFG materials show hardening by annealing while others do not. For example, copper annealed after high-pressure torsion at temperatures in the range of 0.25 to 0.3 Tm (depending on the copper purity) demonstrated similar hardening behaviour, which was explained by agglomeration and annihilation of deformation-induced vacancies [18].…”

Section: Hardnessmentioning

confidence: 95%

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Effect of Severe Plastic Deformation on the Conductivity and Strength of Copper-Clad Aluminium Conductors

Lapovok

Dubrovsky

Kosinova

et al. 2019

Metals

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Aluminium rods with different copper sheath thicknesses were processed by severe plastic deformation at room temperature and then annealed, to join the constituent metals and produce a nanocrystalline microstructure. A study of the effects of the deformation parameters, copper cladding thickness and annealing temperature on the electrical conductivity and hardness of the conductors is reported. It is shown that an interface forms between constituents because of intermixing in the course of severe shear deformation under high hydrostatic pressure and diffusion during the subsequent annealing. The effective conductivity of the aluminium copper-clad conductor dropped after deformation, but was recovered during annealing, especially during short annealing at 200 • C, to a level exceeding the theoretically predicted one. In addition, the annealing resulted in increased hardness at the interface and copper sheath.

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Section: Electrical Conductivitysupporting

confidence: 92%

Section: Hardnessmentioning

confidence: 95%

Effect of Severe Plastic Deformation on the Conductivity and Strength of Copper-Clad Aluminium Conductors

Lapovok

Dubrovsky

Kosinova

et al. 2019

Metals

Self Cite

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“… for numerical modeling and Figure for some experimental data) is beneficial to achieve better dielectricity. It worth mentioning that the HPT method exhibits high potential in other fields of electrical materials for enhancement of conductivity‐strength combination, thermoelectricity, and superconductivity . The increase in the dielectric constant for nanograined BaTiO 3 is of importance for the development of high‐capacitance multilayered ceramic capacitors …”

Section: Recent Findings On Hpt Processing Of Oxidesmentioning

confidence: 99%

Review on Recent Advancements in Severe Plastic Deformation of Oxides by High‐Pressure Torsion (HPT)

Edalati

2018

Adv Eng Mater

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Severe plastic deformation (SPD) of oxides has been of interest in mineralogy and geology for many decades, but oxides have ionic or covalent bonds with brittle nature and can hardly be deformed at ambient temperature. SPD processing of oxides is first realized in 1930s, when Percy W. Bridgman introduce the principles of high-pressure torsion (HPT) method. Although the method is widely used nowadays to produce ultrafine-grained (UFG) metals, the application of method for SPD processing of oxides is quite limited. This article reviews some of the recent publications on the application of HPT method to oxide ceramics () and summarizes their major findings: powder compaction and partial consolidation, nanograin formation, formation of different kinds of lattice defects such as dislocations and oxygen vacancies, strain and grain size dependence of phase transformations, and improvement of functional properties such as bandgap narrowing, photoluminescence, photocatalytic activity, and dielectricity. Early Studies on HPT Processing of OxidesAs mentioned earlier, SPD processing of oxides has been of interest for many decades in mineralogy and geology. Boeker is

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“…Поскольку известно, что ИПДК при повышенных температурах ускоряет диффузионные процессы в УМЗ-материалах, то ускоренная диффузия примесных атомов может приводить к закреплению ими дислокаций и вызвать появление зуба текучести на диаграммах деформирования в образцах HPT_RT-HPT_230 и HPT_RT-HPT_280 (рис. 5), подобно тому, как это наблюдалось для ряда алюминиевых сплавов (например, в [13,43] [13]. Не наблюдался эффект упрочнения как после дополнительной ИПДК при повышенной температуре [1], так и после отжигов [6] и в сплавах системы Al−Mg−Si, в которых была предварительно сформирована УМЗ-структура методом ИПДК при КТ.…”

Section: обсуждение экспериментальных результатовunclassified

“…Известно, что деформация алюминиевых сплавов при повышенных температурах может приводить к протеканию в них деформационного старения (ДС), которое, как правило, более эффективно способствует образованию наноразмерных частиц интерметаллидных фаз, чем отжиг при идентичных температурах. Например, для УМЗ-сплава Al−2Fe [13], структурированного интенсивной пластической деформацией при комнатной температуре (КТ), было показано, что применение дополнительной ИПД при повышенной температуре приводит к значительно более высокой электропроводности при одинаковом уровне прочности по сравнению с применением отжига при той же температуре. Для сплава системы Al−Mg−Si в УМЗ-состоянии также была показана эффективность использования дополнительной ИПД при повышенных температурах для более глубокого распада твердого раствора и формирования наноразмерных частиц вторичных фаз в результате реализации ДС, что обеспечивало значительное повышение электропроводности при сохранении относительно высокого уровня прочности [1].…”

Section: Introductionunclassified

Влияние дополнительной интенсивной пластической деформации при повышенных температурах на микроструктуру и функциональные свойства ультрамелкозернистого сплава Al-0.4Zr

Орлова¹,

Латынина²,

Мурашкин³

et al. 2019

Физика Твердого Тела

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The effect of high pressure torsion (HPT) at elevated temperatures of 230 and 280°C on the microstructure, mechanical properties and electrical conductivity of ultrafine-grained (UFG) Al-0.4Zr alloy was studied. The initial UFG structure in the material of the study was preliminarily formed by HPT-processing at room temperature. It was shown that the additional deformation of the UFG Al-0.4Zr alloy at elevated temperatures leads to a simultaneous significant increase in strength from 140 to 230-280 MPa and electrical conductivity from ~ 47.5% to 52-54% IACS. The obtained results are compared with the effect of annealing at the same temperatures on the microstructure and properties of the UFG Al-0.4Zr alloy. It was found that, compared with annealing, severe plastic deformation at the same temperature leads to more efficient formation of nanoscale precipitates of the Al3Zr secondary phase and, consequently, to a larger decrease in the Zr concentration in the solid solution, which provides a significant increase in electrical conductivity. Based on the obtained microstructural parameters, the contributions of various hardening mechanisms to the total hardening and electron scattering mechanisms to electrical resistivity are estimated. Comparison of the theoretical estimates with the experimental results indicates that the hardening in the UFG structure of the Al-0.4Zr alloy caused by additional SPD at elevated temperatures cannot be described only by the action of hardening mechanisms traditional for UFG materials. Possible reasons for the colossal hardening obtained are discussed.

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Optimization of Strength‐Electrical Conductivity Properties in Al–2Fe Alloy by Severe Plastic Deformation and Heat Treatment

Cited by 33 publications

References 23 publications

Effect of Severe Plastic Deformation on the Conductivity and Strength of Copper-Clad Aluminium Conductors

Effect of Severe Plastic Deformation on the Conductivity and Strength of Copper-Clad Aluminium Conductors

Review on Recent Advancements in Severe Plastic Deformation of Oxides by High‐Pressure Torsion (HPT)

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