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Metals 2015, 5(2), 763-776;

Ultrafine-Grained Precipitation Hardened Copper Alloys by Swaging or Accumulative Roll Bonding

Central Laboratory, Research & Development, Wieland-Werke AG, Graf-Arco-Str. 36, 89079 Ulm, Germany
Institute of Materials Science and Engineering, TU Clausthal, Agricola-Str. 6, 38678 Clausthal-Zellerfeld, Germany
Author to whom correspondence should be addressed.
Academic Editor: Heinz Werner Höppel
Received: 30 March 2015 / Revised: 7 May 2015 / Accepted: 8 May 2015 / Published: 13 May 2015
(This article belongs to the Special Issue Ultrafine-grained Metals)
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There is an increasing demand in the industry for conductive high strength copper alloys. Traditionally, alloy systems capable of precipitation hardening have been the first choice for electromechanical connector materials. Recently, ultrafine-grained materials have gained enormous attention in the materials science community as well as in first industrial applications (see, for instance, proceedings of NANO SPD conferences). In this study the potential of precipitation hardened ultra-fine grained copper alloys is outlined and discussed. For this purpose, swaging or accumulative roll-bonding is applied to typical precipitation hardened high-strength copper alloys such as Corson alloys. A detailed description of the microstructure is given by means of EBSD, Electron Channeling Imaging (ECCI) methods and consequences for mechanical properties (tensile strength as well as fatigue) and electrical conductivity are discussed. Finally the role of precipitates for thermal stability is investigated and promising concepts (e.g. tailoring of stacking fault energy for grain size reduction) and alloy systems for the future are proposed and discussed. The relation between electrical conductivity and strength is reported. View Full-Text
Keywords: Cu-Ni-Si alloys; swaging; accumulative roll bonding; precipitation hardening Cu-Ni-Si alloys; swaging; accumulative roll bonding; precipitation hardening

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Altenberger, I.; Kuhn, H.-A.; Gholami, M.; Mhaede, M.; Wagner, L. Ultrafine-Grained Precipitation Hardened Copper Alloys by Swaging or Accumulative Roll Bonding. Metals 2015, 5, 763-776.

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