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Author: search.filters.author.MOOKAM, NiwatSubject: search.filters.subject.lead-free solder

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    Influence of Cu content on microstructure, grain orientation and mechanical properties of Sn–xCu lead-free solders
    (2022-04-01)
    KANLAYASIRI, Kannachai
    ;
    MOOKAM, Niwat
    The effect of Cu content on the microstructure, grain orientation and mechanical properties of Sn–xCu (x=0–4.0 wt.%) lead-free solder was studied. Results showed that added Cu induced the formation of intermetallic phases. Only the η-Cu<inf>6</inf>Sn<inf>5</inf> and ɛ-Cu<inf>3</inf>Sn phases were present in the β-Sn matrix. For all contents, the strongly preferred orientation of the β-Sn phase was formed on the {001} plane. In Sn doped with 1.0 wt.% Cu, the η-Cu<inf>6</inf>Sn<inf>5</inf> phase exhibited the preferred orientation of {0001} plane, whereas doping with 3.0 or 4.0 wt.% Cu transformed the preferred orientation to the {010} plane. In addition, only the {0001} and planes were present in the ɛ-Cu<inf>3</inf>Sn phase. The high Cu contents contributed to an increased number of low-angle boundaries, high residual strain, tensile strength and microhardness.