The improvement of electrical conductivity of hypoeutectic Al-Si alloys achieved by composite melt treatment

Cui, Xiaoli; Cui, Hongwei; Wu, Yuying; Liu, Xiangfa

doi:10.1016/j.jallcom.2019.02.242

Cited by 30 publications

(16 citation statements)

References 22 publications

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“…The precipitation sequences in Al-Mg-Si alloys is as follows [23] : Al SSS !Si Clusters and Mg Clusters!Dissolution of Mg clusters !Mg/Si coclusters!Small precipitates of unknown Reproduced with permission. [6] Copyright 2019, Elsevier.…”

Section: Al-mg-si Series Aluminum Alloysmentioning

confidence: 99%

“…A widely held view for high-UTS and high-EC Al alloys is that the UTS is above 300-320 MPa, and the EC is above 52-53% IACS. [6] Nevertheless, the conventional methods for production of AAACs are thermomechanical processes, which consists of solution heat treatment followed by water quenching, cold drawing, and artificial aging (or annealing). [2] Therefore, it is challenging for the processes to increase both EC and UTS.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 2. a,b) Microstructure of Al-7Si alloy d) without and e) with Sr modification. Schematic of electronic transmission in Al-7Si alloy c) withoutand f) with Sr. Reproduced with permission [6]. Copyright 2019, Elsevier.…”

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confidence: 99%

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Conductive Al Alloys: The Contradiction between Strength and Electrical Conductivity

et al. 2021

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In recent years, the severe energy consumption identified in the global powertransmission process makes the development of new generation of transmission materials with high strength (mainly the ultimate tensile strength) and outstanding electrical conductivity (EC) more urgent. Though Al and its alloys received significant attention from the scientific community in the past two decades due to their relatively high mechanical properties and excellent EC, increasing strength and EC are often incompatible in Al conductor alloys, which remains unresolved. Therefore, the ways to achieve the optimal compromise between the strength and EC has become a hot topic in current researches. This review focuses on the high-strength conductive Al alloys that have been studied by researchers in the past two decades, and endeavors to reveal the relationship between the EC and the strength based on composition, microstructure, interface, and others. Moreover, the design ideas and treatment measures considering both conductivity and strength are also summarized.

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Section: Al-mg-si Series Aluminum Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Conductive Al Alloys: The Contradiction between Strength and Electrical Conductivity

et al. 2021

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“…According to Figure 7, it is worth noting that the conductivity performance of different states for Al-2Fe-xCo alloys are in the following sequence: as-cast < annealing < rolling. It is known that many factors affect the thermal conductivity of alloys, such as alloy composition [2,7,36,37], heat treatment [10,11,38,39], melt treatment [40,41], plastic deformation [1,42], and so on. In our study, compared with the as-cast samples, the thermal conductivities of alloys significantly increase after annealing From Figure 7a, the thermal diffusivity of as-cast specimens first increases from 0.837 cm 2 /s for the Al-2Fe alloy to 0.856 cm 2 /s for Al-2Fe-0.3Co alloy by improving the amplitude of 2.3%, and then gradually decreases with increasing Co content.…”

Section: Conductivity Performance Of Al-2fe-xco Ternary Alloysmentioning

confidence: 99%

Microstructures and Mechanical Properties of Al-2Fe-xCo Ternary Alloys with High Thermal Conductivity

Luo

Huang

et al. 2020

Materials

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The microstructures, mechanical properties, and thermal conductivity (TC) of Al-2Fe-xCo (x = 0~0.8) alloys in as-cast, homogeneous annealed, and cool rolled states are systematically studied. Results indicate that appropriate Co modification (x ≤ 0.5) simultaneously improves the thermal and mechanical properties of as-cast Al-2Fe alloys. The improvement of TC is attributed to ameliorating the morphology of primary Al3Fe phases from needles to short rods and fine particles, which decreases the scattering probability of free electrons during the electronic transmission. However, further increasing the Co content (x = 0.8) decreases the TC due to the formation of a coarse plate-like Al2FeCo phase. Besides, the thermal conductivity of annealed Al-2Fe-xCo alloys is higher than that of as-cast alloys because of the elimination of lattice defects and spheroidization of Al3Fe phases. After cool rolling with 80 % deformation, thermal conductivity of alloys slightly increases due to the breaking down of Al2FeCo phases. The rolled Al-2Fe-0.3Co alloy exhibits the highest thermal conductivity, which is about 225 W/(m·K), approximately 11 % higher than the as-cast Al-2Fe sample. The ultimate tensile strength (UTS) and elongation (EL) of as-cast Al-2Fe-0.5Co (UTS: 138 MPa; EL: 22.0 %) are increased by 35 % and 69 %, respectively, compared with those of unmodified alloy (UTS: 102 MPa; EL: 13.0 %).

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“…Au, Ag, Cu, and Al are four kinds of excellent conductive materials, among which Al-depending on its excellent comprehensive performance-is widely used on the overhead transmission line as the outer layer of Al conductor steel reinforced (ACSR) [1][2][3][4][5]. In recent years, more and more Al alloy conductors were developed to replace the expensive copper to prepare Al-Fe cable and to replace the steel core to strand Al conductor steel reinforced (ACSR) and all Al alloy conductor (AAAC) to acquire higher energy efficiency [6,7].…”

Section: Introductionmentioning

confidence: 99%

Role of Multi-Scale Microstructure in the Degradation of Al Wire for Power Transmission

Liu

et al. 2020

Applied Sciences

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As common conductive materials, Al wires are used on overhead transmission lines under long-term heating conditions. In this study, the strength degradation behavior and the strength-electrical conductivity relation of the commercially pure Al wires (CPAWs) and the Al-Fe wires (AFWs) annealed at various temperatures were investigated based on the microstructure evolution. The strength degradation rate of the AFW is always higher than that of the CPAW. A linear trade-off relation between strength and electrical conductivity for the annealed Al wires are clarified. The results reveal that the mechanisms behind the trade-off relation between the strength and the electrical conductivity for the annealed CPAWs and the annealed AFWs are the recovery of dislocations and the obvious increase of grain width, which leads to the decrease of strength and the increase of electrical conductivity. The coalescence of precipitate in the AFW leads to the obvious decrease of strength, which results in the higher strength degradation rate for the AFW as compared with that for the CPAW. Consequently, the principle of microstructure design for anti-degradation of Al wire is presented.

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The improvement of electrical conductivity of hypoeutectic Al-Si alloys achieved by composite melt treatment

Cited by 30 publications

References 22 publications

Conductive Al Alloys: The Contradiction between Strength and Electrical Conductivity

Conductive Al Alloys: The Contradiction between Strength and Electrical Conductivity

Microstructures and Mechanical Properties of Al-2Fe-xCo Ternary Alloys with High Thermal Conductivity

Role of Multi-Scale Microstructure in the Degradation of Al Wire for Power Transmission

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