Journal
MATERIALS & DESIGN
Volume 132, Issue -, Pages 148-157Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2017.06.062
Keywords
Aluminum alloys; Precipitation; Electrical conductivity; Strength
Categories
Funding
- National Natural Science Foundation of China (NSFC) [51331007]
- State Grid Corporation of China [52110416001z]
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Outstanding mechanical and conductive properties are vital to Al alloys used as overhead conductors. However, high strength and high electrical conductivity are usually mutually exclusive in metallic materials. In this study, we present a novel method to achieve high strength and high conductivity in an Al-Mg-Si conductor. Numerous dispersive nano-scale precipitates were obtained using an artificial aging treatment for a 6201RE Al alloy conductor. The precipitation of the alloying elements in the form of nano-scale precipitates is determined to play a strengthening role, decreasing the concentration of alloying elements in the matrix and reduce lattice distortion such that high strength (352.3MPa) and high electrical conductivity (56.0% IACS) are achieved simultaneously in a 6201RE Al alloy. High strength and enhanced electrical conductivity could be achieved by introducing the nanoscale precipitates in the Al alloy. Finally, the strengthening mechanisms and the electrical conductivity induced by the nano-scale precipitates were discussed. (C) 2017 Elsevier Ltd. All rights reserved.
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