Properties of new cast antifrictional aluminum alloys

Миронов, А. Е.; Гершман, Иосиф; Kotova, E. G.; Ovechkin, A. V.; Гершман, Е. И.; Железнов, М. М.

doi:10.3103/s1068798x17010154

Cited by 7 publications

(5 citation statements)

References 5 publications

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“…This paper continues the studies of new antifriction aluminum alloys beginning in [1][2][3][4][5][6][7][8]. Previously, the authors investigated compositions, mechanical and tribological properties of the new antifriction aluminum alloys.…”

Section: Introductionmentioning

confidence: 70%

Relationship of Secondary Structures and Wear Resistance of Antifriction Aluminum Alloys for Journal Bearings from the Point of View of Self-Organization During Friction

Гершман

Миронов

Podrabinnik

et al. 2019

Entropy

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The paper investigates the relationship between the tribological properties/compositions of new aluminum antifriction alloys and compositions of the secondary structures formed on their friction surfaces. Eight alloys with various compositions have been analyzed. The elemental compositions of the secondary structures on their friction surfaces have been determined. The relationship between the alloy secondary structure compositions with wear rate has been found. An attempt has been made to determine the secondary structure composition patterns based on the non-equilibrium thermodynamics and self-organization theory.

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Section: Introductionmentioning

confidence: 70%

Relationship of Secondary Structures and Wear Resistance of Antifriction Aluminum Alloys for Journal Bearings from the Point of View of Self-Organization During Friction

Гершман

Миронов

Podrabinnik

et al. 2019

Entropy

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“…Zn and Mg are incorporated into the Al-based solid solution and soft inclusions and do not form their own phases [ 1 ]. The investigated alloys’ characteristics are compared to those of cast Br.Sn4Zn4Pb17 bronze, which is extensively utilized as a bearing material [ 15 , 46 ]. The Br.Sn4Zn4Pb17 bearing bronze has an ultimate tensile strength of 148MPa, elongation to failure of 8.8%, and hardness of 65 HB [ 15 ].…”

Section: Discussionmentioning

confidence: 99%

“…The investigated alloys’ characteristics are compared to those of cast Br.Sn4Zn4Pb17 bronze, which is extensively utilized as a bearing material [ 15 , 46 ]. The Br.Sn4Zn4Pb17 bearing bronze has an ultimate tensile strength of 148MPa, elongation to failure of 8.8%, and hardness of 65 HB [ 15 ]. The experimental aluminum alloys ( Table 7 ) exhibit higher strength than those of Br.Sn4Zn4Pb17 bronze.…”

Section: Discussionmentioning

confidence: 99%

“…The proper selection of bearing materials is crucial for securing the operation of friction units and avoiding failure. Materials of monometallic bearings for capacity expansion and toughness operations should exhibit good mechanical properties with good anti-friction properties [ 15 , 16 , 17 , 18 , 19 , 20 ]. Lead and tin are considered the most common alloying elements in aluminum anti-friction alloys [ 21 , 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

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Bearing Aluminum-Based Alloys: Microstructure, Mechanical Characterizations, and Experiment-Based Modeling Approach

Mosleh

Kotova²,

Котов

et al. 2022

Materials

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Due to the engine’s start/stop system and a sudden increase in speed or load, the development of alloys suitable for engine bearings requires excellent tribological properties and high mechanical properties. Including additional elements in the Al-rich matrix of these anti-friction alloys should strengthen their tribological properties. The novelty of this work is in constructing a suitable artificial neural network (ANN) architecture for highly accurate modeling and prediction of the mechanical properties of the bearing aluminum-based alloys and thus optimizing the chemical composition for high mechanical properties. In addition, the study points out the impact of soft and more solid phases on the mechanical properties of these alloys. For this purpose, a huge number of alloys (198 alloys) with different chemical compositions combined from Sn, Pb, Cu, Mg, Zn, Si, Ni, Bi, Ti, Mn, Fe, and Al) were cast, annealed, and tested for determining their mechanical properties. The annealed sample microstructure analysis revealed the formation of soft structural inclusions (Sn-rich, Sn-Pb, and Pb-Sn phases) and solid phase inclusions (strengthened phase, Al2Cu). The mechanical properties of ultimate tensile strength (σu), Brinell hardness (HB), and elongation to failure (δ) were used as control responses for constructing the ANN network. The constructed network was optimized by attempting different network architecture designs to reach minimal errors. Besides the excellent tribological characteristics of the designed set of alloys, soft inclusions based on Sn and Pb and solid-phase Cu inclusions fulfilled the necessary level of mechanical properties for anti-friction alloys; the maximum mechanical properties reached were: σu = 197 ± 7 MPa, HB = 77 ± 4, and δ = 20.3 ± 1.0%. The optimal ANN architecture with the lowest errors (correlation coefficient (R) = 0.94, root mean square error (RMSE) = 3.5, and average actual relative error (AARE) = 1.0%) had two hidden layers with 20 neurons. The model was validated by additional experiments, and the characteristics of the new alloys were accurately predicted with a low level of errors: R ≥ 0.97, RMSE = 1–2.65, and AARE ˂ 10%.

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“…Одна из сфер, в которой могут быть использованы алюминиевые сплавы, -антифрикционные материалы, в том числе транспортного назначения. Антифрикционные алюминиевые сплавы являются наиболее перспективными и используются для изготовления подшипников скольжения, поскольку они более чем в 3 раза легче бронз и существенно дешевле [4][5][6][7][8].…”

Section: Introductionunclassified

Effect of bismuth and lead on phase composition and structure of Al—5%Si—4%Cu—4%Sn alloy

Червякова

Яковлева

Белов

et al. 2019

Izv.VUZ. Tsvet. Met.

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Статья посвящена актуальной на сегодняшний день проблеме создания антифрикционных алюминиевых сплавов, экономнолегированных легкоплавкими металлами. В ранних исследованиях было установлено, что сбалансированным комплексом технологических и физико-механических свойств обладает сплав, содержащий, мас.%: около 5 Si, 4 Cu и 6 Sn. В данной работе в связи с высокой стоимостью олова рассмотрена возможность снижения его концентрации до 4 % и его частичной замены другими легкоплавкими металлами, такими как висмут и свинец. С использованием термодинамических расчетов в программе Thermo-Calc, включая построение политермических и изотермических разрезов, было изучено совместное и раздельное влияние этих элементов на фазовый состав сплава Al-5%Si-4%Cu-4%Sn. Показано, что добавки свинца и висмута приводят к появлению обширной области расслоения жидкости, в связи с чем их суммарная концентрация не должна превышать 1-2 %. С использованием сканирующей электронной микроскопии и микрорентгеноспектрального анализа изучены фазовый состав и микроструктура сплава Al-5%Si-4%Cu-4%Sn-0,5%Pb-0,5%Bi. Выявлено, что в литом состоянии легкоплавкие металлы распределены равномерно в структуре экспериментального сплава, а по совокупности свойств этот материал превосходит антифрикционную бронзу БрО4Ц4С17. Термическая обработка по режиму Т6 приводит к существенному повышению твердости исследуемого сплава. Однако в процессе нагрева под закалку при 500 °С происходит локальное оплавление легкоплавкой составляющей, что обуславливает ухудшение микроструктуры при повторной кристаллизации и, как следствие, служит причиной охрупчивания материала.

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Properties of new cast antifrictional aluminum alloys

Cited by 7 publications

References 5 publications

Relationship of Secondary Structures and Wear Resistance of Antifriction Aluminum Alloys for Journal Bearings from the Point of View of Self-Organization During Friction

Relationship of Secondary Structures and Wear Resistance of Antifriction Aluminum Alloys for Journal Bearings from the Point of View of Self-Organization During Friction

Bearing Aluminum-Based Alloys: Microstructure, Mechanical Characterizations, and Experiment-Based Modeling Approach

Effect of bismuth and lead on phase composition and structure of Al—5%Si—4%Cu—4%Sn alloy

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