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Two different Sn–Cu/Co and Sn/Co–Cu reaction couples were examined at temperatures ranging from 150°C to 200°C to examine the Cu alloying effect by varying Cu contents. Two reaction phases, CoSn 3 and (Cu,Co) 6 Sn 5 , were observed simultaneously at the interfaces of the Sn–Cu/Co couples (0.1wt%–3wt%Cu). The CoSn 3 layer was much thicker than (Cu,Co) 6 Sn ...
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