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The interfacial microstructure and Kirkendall voids between eutectic SnIn and polycrystalline Cu substrate was investigated after reflowing and long-term solid-state aging process. The results indicated that two crystal-structure IMC species: Cu(In, Sn)2 phase existing at the solder side and Cu2(In, Sn) phase locating at the Cu side, among which Cu2(In, Sn) phase with two different morphologies, the...
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