81 research outputs found

    ΠΠ½ΠΎΠΌΠ°Π»ΡŒΠ½Ρ‹ΠΉ рост Π·Π΅Ρ€Π΅Π½ Π² ΠΊΡ€ΠΈΠΎΠ³Π΅Π½Π½ΠΎ-Π΄Π΅Ρ„ΠΎΡ€ΠΌΠΈΡ€ΠΎΠ²Π°Π½Π½ΠΎΠΉ ΠΌΠ΅Π΄ΠΈ

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    Structural changes in cryogenically deformed copper during long-term (up to two years) room-temperature ageing were investigated. It is found that the structure formed under high (e=8.2) cryogenic deformation is unstable and is characterized by abnormalous grain growth. It is shown that the grain growth is preceded by a long (up to a year) incubation period. It is revealed that the structure rapidly losses stability with an increase in accumulated cryogenic strain

    ВлияниС ΠΊΡ€ΠΈΠΎΠ³Π΅Π½Π½ΠΎΠΉ ΠΏΡ€ΠΎΠΊΠ°Ρ‚ΠΊΠΈ Π½Π° микроструктуру ΠΈ мСханичСскиС свойства ΠΌΠ΅Π΄ΠΈ

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    The effect of cryogenic rolling on the structure and mechanical properties of copper was studied. The grain structure evolution was shown to be mainly governed by the geometrical effect of the imposed strain whereas the contribution of the mechanical twinning and grain subdivision was found to be not significant. The analysis of the developed texture demonstrated that the plastic flow arises mainly from conventional {111} slip. The cryogenic rolling was shown to increase strength and decrease ductility and both effects might be attributed to the substructure

    Π€ΠΎΡ€ΠΌΠΈΡ€ΠΎΠ²Π°Π½ΠΈΠ΅ микроструктуры Π² Ρ…ΠΎΠ΄Π΅ ΠΊΡ€ΠΈΠΎΠ³Π΅Π½Π½ΠΎΠΉ ΠΏΡ€ΠΎΠΊΠ°Ρ‚ΠΊΠΈ ΠΌΠ΅Π΄ΠΈ

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    ΠŸΡ€ΠΎΠ²Π΅Π΄Π΅Π½Π° Ρ‚Ρ‰Π°Ρ‚Π΅Π»ΡŒΠ½Π°Ρ аттСстация микроструктуры ΠΈ мСханичСских свойств ΠΌΠ΅Π΄ΠΈ, ΠΏΠΎΠ΄Π²Π΅Ρ€Π³Π½ΡƒΡ‚ΠΎΠΉ Ρ€Π°Π·Π»ΠΈΡ‡Π½ΠΎΠΉ стСпСни ΠΊΡ€ΠΈΠΎΠ³Π΅Π½Π½ΠΎΠΉ ΠΏΡ€ΠΎΠΊΠ°Ρ‚ΠΊΠΈ. Показано, Ρ‡Ρ‚ΠΎ ΡΠ²ΠΎΠ»ΡŽΡ†ΠΈΡ Π·Π΅Ρ€Π΅Π½Π½ΠΎΠΉ структуры, Π² основном, ΠΎΠΏΡ€Π΅Π΄Π΅Π»ΡΠ»Π°ΡΡŒ гСомСтричСским эффСктом Π΄Π΅Ρ„ΠΎΡ€ΠΌΠ°Ρ†ΠΈΠΈ. На основС Π°Π½Π°Π»ΠΈΠ·Π° тСкстурных Π΄Π°Π½Π½Ρ‹Ρ… Π±Ρ‹Π» сдСлан Π²Ρ‹Π²ΠΎΠ΄, Ρ‡Ρ‚ΠΎ ΠΊΡ€ΠΈΠΎΠ³Π΅Π½Π½Ρ‹Π΅ условия Π΄Π΅Ρ„ΠΎΡ€ΠΌΠ°Ρ†ΠΈΠΈ Π½Π΅ ΠΏΡ€ΠΈΠ²Π΅Π»ΠΈ ΠΊ Ρ„ΡƒΠ½Π΄Π°ΠΌΠ΅Π½Ρ‚Π°Π»ΡŒΠ½ΠΎΠΌΡƒ измСнСнию Ρ…Π°Ρ€Π°ΠΊΡ‚Π΅Ρ€Π° пластичСского тСчСния, ΠΈ основным ΠΌΠ΅Ρ…Π°Π½ΠΈΠ·ΠΌΠΎΠΌ Π΄Π΅Ρ„ΠΎΡ€ΠΌΠ°Ρ†ΠΈΠΈ Π±Ρ‹Π»ΠΎ дислокационноС {111} скольТСниС. УстановлСно, Ρ‡Ρ‚ΠΎ криогСнная ΠΏΡ€ΠΎΠΊΠ°Ρ‚ΠΊΠ° ΠΏΡ€ΠΈΠ²ΠΎΠ΄ΠΈΡ‚ ΠΊ сущСствСнному ΡƒΠ²Π΅Π»ΠΈΡ‡Π΅Π½ΠΈΡŽ прочности ΠΈ Π½Π΅ΠΊΠΎΡ‚ΠΎΡ€ΠΎΠΌΡƒ сниТСнию пластичности

    ВлияниС ΠΊΡ€ΠΈΠΎΠ³Π΅Π½Π½ΠΎΠΉ осадки Π½Π° микроструктуру ΠΊΠ°Ρ‚Π°Π½ΠΎΠΉ мСлкозСрнистой ΠΌΠ΅Π΄ΠΈ

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    ИсслСдована Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡ‚ΡŒ сущСствСнного ΠΈΠ·ΠΌΠ΅Π»ΡŒΡ‡Π΅Π½ΠΈΡ Π·Π΅Ρ€Π΅Π½ Π² тСхничСски чистой ΠΌΠ΅Π΄ΠΈ ΠΏΡƒΡ‚Π΅ΠΌ ΠΊΡ€ΠΈΠΎΠ³Π΅Π½Π½ΠΎΠΉ осадки. УстановлСно, Ρ‡Ρ‚ΠΎ ΡΠ²ΠΎΠ»ΡŽΡ†ΠΈΡ структуры Π² Ρ†Π΅Π»ΠΎΠΌ ΠΎΠΏΡ€Π΅Π΄Π΅Π»ΡΠ»Π°ΡΡŒ ΡΠΏΠ»ΡŽΡ‰ΠΈΠ²Π°Π½ΠΈΠ΅ΠΌ исходных Π·Π΅Ρ€Π΅Π½ Π² Ρ…ΠΎΠ΄Π΅ Π΄Π΅Ρ„ΠΎΡ€ΠΌΠ°Ρ†ΠΈΠΈ. Анализ тСкстурных Π΄Π°Π½Π½Ρ‹Ρ… ΠΈ спСктра Ρ€Π°Π·ΠΎΡ€ΠΈΠ΅Π½Ρ‚ΠΈΡ€ΠΎΠ²ΠΎΠΊ ΠΏΠΎΠΊΠ°Π·Π°Π», Ρ‡Ρ‚ΠΎ основным ΠΌΠ΅Ρ…Π°Π½ΠΈΠ·ΠΌΠΎΠΌ пластичСского тСчСния являлось ΠΎΠ±Ρ‹Ρ‡Π½ΠΎΠ΅ {111} дислокационноС скольТСниС ΠΏΡ€ΠΈ нСсущСствСнном Π²ΠΊΠ»Π°Π΄Π΅ мСханичСского двойникования

    ΠšΡ€ΠΈΠΎΠ³Π΅Π½Π½Π°Ρ дСформация ΠΌΠ΅Π΄ΠΈ

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    The effect of cryogenic deformation on the structure refinement of copper was studied

    ΠœΠΎΠ΄Π΅Π»ΠΈΡ€ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΈ оптимизация процСсса пСрСмСщСния Π³Ρ€ΡƒΠ·ΠΎΠ² Π² логистичСской Ρ‚Ρ€Π°Π½- ΠΏΠΎΡ€Ρ‚Π½ΠΎΠΉ систСмС

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    Network model and algorithm for the solution of optimization problem concerning cargo transportation process within multi-terminal network in accordance with several efficiency criteria of transportation system operation have been constructed and elaborated in the paper.The paper gives the algorithm that makes it possible to trace routes and cyclic routes of maximum carrying capacity of a transportation flow.ΠŸΠΎΡΡ‚Ρ€ΠΎΠ΅Π½Π° сСтСвая модСль ΠΈ Ρ€Π°Π·Ρ€Π°Π±ΠΎΡ‚Π°Π½ Π°Π»Π³ΠΎΡ€ΠΈΡ‚ΠΌ Ρ€Π΅ΡˆΠ΅Π½ΠΈΡ Π·Π°Π΄Π°Ρ‡ΠΈ ΠΎΠΏΡ‚ΠΈΠΌΠΈΠ·Π°Ρ†ΠΈΠΈ процСсса пСрСмСщСния Π³Ρ€ΡƒΠ·ΠΎΠ² Π² многополюсной трайспортной сСти ΠΏΠΎ нСскольким критСриям эффСктивности функционирования транспортной систСмы.ΠŸΡ€ΠΈΠ²Π΅Π΄Π΅Π½ Π°Π»Π³ΠΎΡ€ΠΈΡ‚ΠΌ отыскания ΠΌΠ°Ρ€ΡˆΡ€ΡƒΡ‚ΠΎΠ² ΠΈ цикличСских ΠΌΠ°Ρ€ΡˆΡ€ΡƒΡ‚ΠΎΠ² максимальной пропускной способности транспортного ΠΏΠΎΡ‚ΠΎΠΊΠ°

    Об эффСктивности ΠΊΡ€ΠΈΠΎΠ³Π΅Π½Π½ΠΎΠΉ Π΄Π΅Ρ„ΠΎΡ€ΠΌΠ°Ρ†ΠΈΠΈ для ΠΈΠ·ΠΌΠ΅Π»ΡŒΡ‡Π΅Π½ΠΈΡ микроструктуры ΠΌΠ΅Π΄ΠΈ

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    In the work, we studied and compared the microstructures of commercially pure copper subjected to the same strain at room temperature and at liquid-nitrogen temperature. It is found that at rather low plastic strain (slump, e=1.0), cryogenic temperature assists the activation of mechanical twinning and somewhat accelerates the formation of deformation boundaries. At high plastic strain (high-pressure shear, e=8.4), cryogenic temperature adds too little to microstructure refinement

    Annealing behavior of cryogenically-rolled Cu-30Zn brass

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    The static-annealing behavior of cryogenically-rolled Cu-30Zn brass over a wide range of temperature (100-900 Β°C) was established. Between 300 and 400 Β°C, microstructure and texture evolution were dominated by discontinuous recrystallization. At temperatures of 500 Β°C and higher, annealing was interpreted in terms of normal grain growth. The recrystallized microstructure developed at 400 Β°C was ultrafine with a mean grain size of 0.8 ΞΌm, fraction of high-angle boundaries of 90 pct., and a weak crystallographic texture

    ΠžΠΏΡ‚ΠΈΠΌΠ°Π»ΡŒΠ½Ρ‹ΠΉ синтСз ΠΌΠ½ΠΎΠ³ΠΎΠΏΠΎΠ»ΡŽΡΠ½Ρ‹Ρ… сСтСй

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    Mathematical model for synthesis of multi-terminal network with the given flow parameters has been constructed. An algorithm of optimum synthesis of the network with the given parameters of multi-terminal flow and minimum cost is presented in the paper.ΠŸΠΎΡΡ‚Ρ€ΠΎΠ΅Π½Π° матСматичСская модСль синтСза ΠΌΠ½ΠΎΠ³ΠΎΠΏΠΎΠ»ΡŽΡΠ½Ρ‹Ρ… сСтСй с Π·Π°Π΄Π°Π½Π½Ρ‹ΠΌΠΈ ΠΏΠ°Ρ€Π°ΠΌΠ΅Ρ‚Ρ€Π°ΠΌΠΈ ΠΏΠΎΡ‚ΠΎΠΊΠ°. ΠŸΡ€ΠΈΠ²Π΅Π΄Π΅Π½ Π°Π»Π³ΠΎΡ€ΠΈΡ‚ΠΌ ΠΎΠΏΡ‚ΠΈΠΌΠ°Π»ΡŒΠ½ΠΎΠ³ΠΎ синтСза сСти с Π·Π°Π΄Π°Π½Π½Ρ‹ΠΌΠΈ ΠΏΠ°Ρ€Π°ΠΌΠ΅Ρ‚Ρ€Π°ΠΌΠΈ многополюсного ΠΏΠΎΡ‚ΠΎΠΊΠ° ΠΈ ΠΌΠΈΠ½ΠΈΠΌΠ°Π»ΡŒΠ½Ρ‹ΠΌΠΈ Π·Π°Ρ‚Ρ€Π°Ρ‚Π°ΠΌΠΈ

    ΠΠžΠ’Π«Π™ ΠΠ›Π“ΠžΠ Π˜Π’Πœ Π Π•Π¨Π•ΠΠ˜Π― Π—ΠΠ”ΠΠ§Π˜ О ΠœΠΠšΠ‘Π˜ΠœΠΠ›Π¬ΠΠžΠœ ΠŸΠžΠ’ΠžΠšΠ•

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    A new algorithm for detection of a maximum flow in multi-terminal network. The algorithm is based on its matrices description and execution of ternary operations in respect of matrix elements pertaining to arc capacity.Β  Therefore the algorithm does not require graphic network presentation. For this reason the programming realization of the developed algorithm is rather simple and it can be applied while solving a large scope of problems when mathematical models can be formulated in terms of a graph theory.Π Π°Π·Ρ€Π°Π±ΠΎΡ‚Π°Π½ Π½ΠΎΠ²Ρ‹ΠΉ Π°Π»Π³ΠΎΡ€ΠΈΡ‚ΠΌ нахоТдСния максимального ΠΏΠΎΡ‚ΠΎΠΊΠ° Π² многополюсной сСти, ΠΊΠΎΡ‚ΠΎΡ€Ρ‹ΠΉ основан лишь Π½Π° Π΅Π΅ ΠΌΠ°Ρ‚Ρ€ΠΈΡ‡Π½ΠΎΠΌ описании ΠΈ осущСствлСнии Ρ‚Π΅Ρ€Π½Π°Ρ€Π½Ρ‹Ρ… ΠΎΠΏΠ΅Ρ€Π°Ρ†ΠΈΠΉ Π½Π°Π΄ элСмСнтами ΠΌΠ°Ρ‚Ρ€ΠΈΡ†Ρ‹ пропускных способностСй Π΄ΡƒΠ³, поэтому ΠΎΠ½ Π½Π΅ Ρ‚Ρ€Π΅Π±ΡƒΠ΅Ρ‚ графичСского прСдставлСния сСти. Π’ силу этого программная рСализация Ρ€Π°Π·Ρ€Π°Π±ΠΎΡ‚Π°Π½Π½ΠΎΠ³ΠΎ Π°Π»Π³ΠΎΡ€ΠΈΡ‚ΠΌΠ° являСтся ΠΎΡ‡Π΅Π½ΡŒ простой, ΠΈ ΠΎΠ½ ΠΌΠΎΠΆΠ΅Ρ‚ Π±Ρ‹Ρ‚ΡŒ использован ΠΏΡ€ΠΈ Ρ€Π΅ΡˆΠ΅Π½ΠΈΠΈ ΡˆΠΈΡ€ΠΎΠΊΠΎΠ³ΠΎ ΠΊΡ€ΡƒΠ³Π° ΠΏΡ€ΠΎΠ±Π»Π΅ΠΌ, матСматичСскиС ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΊΠΎΡ‚ΠΎΡ€Ρ‹Ρ… ΠΌΠΎΠ³ΡƒΡ‚ Π±Ρ‹Ρ‚ΡŒ сформулированы Π² Ρ‚Π΅Ρ€ΠΌΠΈΠ½Π°Ρ… Ρ‚Π΅ΠΎΡ€ΠΈΠΈ Π³Ρ€Π°Ρ„ΠΎΠ²
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