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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XV
Presentation Title Development of High Strength and High Electrical Conductivity of Cu-Ni-Al Alloys
Author(s) Kiyohito Ishida, Takashi Miyamoto, Ikuo Ohnuma, Toshihiro Omori, Ryousuke Kainuma
On-Site Speaker (Planned) Kiyohito Ishida
Abstract Scope Cu-Ni-Al based alloys with high strength and high electrical conductivity (EC) strengthened by the γ’ (L12) phase have been designed using the thermodynamic database of Cu-based alloys. Combinatorial examination of concentration dependence on hardness and EC in the calculated α (fcc) and γ’-Ni3Al two-phase region was conducted using the Vickers hardness test, the four-terminal method and electron probe microanalysis. The measurements were performed in the diffusion zone of Cu/Cu-30Ni/Cu-20Al (mass %) diffusion triples having a wide range of continuous concentration profiles formed by aging at 500℃ for 6, 12 and 18 hours after annealing at 1000℃ for 2 months. Both hardness and EC were found to decrease with increasing Ni and Al content. A good combination with high strength and high EC was obtained in Cu-(6-13) Ni-(1-3) Al base alloys. The developed alloy has been commercially produced and used as suspension wire in a DVD device.
Proceedings Inclusion? Planned: A print-only volume

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