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Metals 2015, 5(4), 2148-2164; doi:10.3390/met5042148

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

1
Institute for Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa 450000, Russia
2
United Company RUSAL, Moscow 109240, Russia
3
Laboratory for Mechanics of Bulk Nanostructured Materials, Saint Petersburg State University, Saint-Petersburg 199034, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Heinz Werner Höppel
Received: 17 September 2015 / Accepted: 17 November 2015 / Published: 20 November 2015
(This article belongs to the Special Issue Ultrafine-grained Metals)
View Full-Text   |   Download PDF [730 KB, uploaded 20 November 2015]   |  

Abstract

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. View Full-Text
Keywords: Al alloy; severe plastic deformation; equal channel angular pressing-Conform; ultrafine grained structure; aging; strength; electrical conductivity Al alloy; severe plastic deformation; equal channel angular pressing-Conform; ultrafine grained structure; aging; strength; electrical conductivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Murashkin, M.; Medvedev, A.; Kazykhanov, V.; Krokhin, A.; Raab, G.; Enikeev, N.; Valiev, R.Z. Enhanced Mechanical Properties and Electrical Conductivity in Ultrafine-Grained Al 6101 Alloy Processed via ECAP-Conform. Metals 2015, 5, 2148-2164.

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