Optimization of electrical conductivity and strength combination by structure design at the nanoscale in Al–Mg–Si alloys

Sauvage, Xavier; Bobruk, Elena V.; Murashkin, M. Yu.; Nasedkina, Y.; Enikeev, Nariman A.; Valiev, Ruslan Z.

doi:10.1016/j.actamat.2015.07.039

Cited by 259 publications

(142 citation statements)

References 54 publications

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“…The size of the precipitates increases considerably near GBs (Figure 3c). The same pattern of spherical β′-precipitates distribution can be observed in the UFG Al-Mg-Si alloys processed via ECAP-PС or conventional ECAP at 100 °C [22,41,42], whereas β-precipitates were observed in the Al-Mg-Si alloy processed by HPT at 130 °C [23]. These precipitates point to the fact that the UFG structure formation during ECAP-C was accompanied by solid solution decomposition due to the dynamic aging (DA).…”

Section: Microstructural Features Of the Alloy Processed Via Ecap-csupporting

confidence: 51%

“…These precipitates point to the fact that the UFG structure formation during ECAP-C was accompanied by solid solution decomposition due to the dynamic aging (DA). It has also been previously observed in various Al-Mg-Si alloys during SPD both at elevated [19][20][21][22][23][24][41][42][43][44][45] and room temperature [23,24,46].…”

Section: Microstructural Features Of the Alloy Processed Via Ecap-cmentioning

confidence: 72%

“…In [22,23] it was found that a notable enhancement of electrical conductivity in UFG Al-Mg-Si alloys after SPD treatment could be achieved by further artificial aging (AA). There has also been noted that AA can lead to both strength and ductility increases in UFG alloys [22,42,44,49], or only to mechanical strength enhancement with an admissible ductility decrease [41].…”

Section: Properties and Microstructure Of The Ufg Alloy Processed Viamentioning

confidence: 99%

“…The strengthening up to 365 MPa can be achieved via grain refinement during SPD, as well as through precipitation hardening induced by following dynamic aging. The research [19][20][21][22][23][24] has also proved that in parallel with the formation of UFG structure, SPD also considerably accelerates the decomposition of a supersaturated solid solution and contributes to a greater reduction of the content of alloying element atoms in the Al matrix of Al-Mg-Si alloys as compared to conventional processing techniques. In good agreement with the Matthiessen's rule for dilute alloys [25], this leads to the increase in electrical conductivity of UFG alloys up to more than 58% IACS [19][20][21].…”

mentioning

confidence: 99%

“…metastable and stable modifications using severe plastic deformation (SPD) [19][20][21][22][23]. The strengthening up to 365 MPa can be achieved via grain refinement during SPD, as well as through precipitation hardening induced by following dynamic aging.…”

mentioning

confidence: 99%

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Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Murashkin

Medvedev

Kazykhanov

et al. 2015

Metals

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This paper studies the effect of equal channel angular pressing-Conform (ECAP-C) and further artificial aging (AA) on microstructure, mechanical, and electrical properties of Al 6101 alloy. As is shown, ECAP-C at 130 °C with six cycles resulted in the formation of an ultrafine-grained (UFG) structure with a grain size of 400-600 nm containing nanoscale spherical metastable β′ and stable β second-phase precipitates. As a result, processed wire rods demonstrated the ultimate tensile strength (UTS) of 308 MPa and electrical conductivity of 53.1% IACS. Electrical conductivity can be increased without any notable degradation in mechanical strength of the UFG alloy by further AA at 170 °C and considerably enhanced by additional decomposition of solid solution accompanied by the formation of rod-shaped metastable β′ precipitates mainly in the ultrafine grain interior and by the decrease of the alloying element content in the Al matrix. It is demonstrated that ECAP-C can be used to process Al-Mg-Si wire rods with the specified UFG microstructure. The mechanical strength and electrical conductivity in this case are shown to be much higher than those in the industrial semi-finished products made of similar material processed by the conventional T6 or T81 treatment. OPEN ACCESSMetals 2015, 5 2149

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Section: Microstructural Features Of the Alloy Processed Via Ecap-csupporting

confidence: 51%

Section: Microstructural Features Of the Alloy Processed Via Ecap-cmentioning

confidence: 72%

Section: Properties and Microstructure Of The Ufg Alloy Processed Viamentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Murashkin

Medvedev

Kazykhanov

et al. 2015

Metals

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

et al. 2017

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High-pressure torsion at room temperature followed by two processing routes, either 1) annealing at 200 C for 8 h or 2) elevated temperature (200 C) high-pressure torsion, are employed to obtain simultaneous increase in mechanical strength and electrical conductivity of Al-2 wt%Fe. The comparative study of microstructure, particle distribution, mechanical properties, and electrical conductivity for both processing routes gives the optimal combination of high mechanical strength and high electrical conductivity in Al-2Fe alloy. It is shown that while the mechanical strength is approximately the same for both processing routes (>320 MPa), high-pressure torsion at elevated temperature results in higher conductivity (!52% IACS) due to reduction of Fe solute atom concentration in Al matrix compared to annealing treatment. High-pressure torsion at 200 C has been demonstrated as a new and effective way for obtaining combination of high mechanical strength and electrical conductivity in Al-Fe alloys.

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Interface Characterization and Performances of a Novel Pure Al Clad Al Alloy Wire

et al. 2018

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Based on the principle of skin effect, a pure Al clad Al alloy wire is designed to break the mutually exclusive relation between strength and electrical conductivity. Actually, bimetallic composite wires offer the ability to blend the desired properties of various metals into a single wire, for example, combining the high-conductivity of pure Al (outer layer) and the high-strength of Al alloy (core). Thus, a novel method is adopted to prepare a pure Al clad Al alloy wire (ACAW) and the metallurgical bonding between pure Al and Al alloy is achieved by compressing the Al alloy cylinder into a hollow pure Al cylinder followed by a series of processes including forging, rolling, and colddrawing. A perfect interface is obtained as the fine grains are found across the interface. Furthermore, a linear rule of mixtures is applied to calculate the performance of ACAW as compared with the measured performance of ACAW. The measured strength of ACAW is the same as the calculated strength. Interestingly, the measured electrical conductivity of ACAW (58.17% IACS) is higher than the calculated electrical conductivity (57.60%IACS). Consequently, ACAW is an effective approach for combining the high-conductivity of pure Al and the high-strength of Al alloy.

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Optimization of electrical conductivity and strength combination by structure design at the nanoscale in Al–Mg–Si alloys

Cited by 259 publications

References 54 publications

Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform

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

Interface Characterization and Performances of a Novel Pure Al Clad Al Alloy Wire

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