| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 830383 | Materials & Design (1980-2015) | 2013 | 10 Pages |
Minor alloying addition to solders has been an important strategy to improve the integrity and reliability of Pb-free solders joint. In this study, the effects of 0.06Ni and 0.5Sb additives on the microstructure and solidification behavior as well as the creep properties of Sn–1.0Ag–0.5Cu (SAC105) alloys were investigated. Results show that alloying of Ni and Sb resulted in considerably reduced undercooling, increased eutectic area and extended volume fraction of proeutectic Sn of which the dendritic size was refined. Moreover, with the addition of Ni and Sb into SAC105, significant improvement in creep resistance of (210%) and (350%) is realized when compared with the SAC105 solder alloy. Likewise, the creep life time of SAC105 alloys was remarkably enhanced (2–3 times) with the minor alloying additions. An analysis of the creep behavior at elevated temperatures suggested that the presence of hard Ni3Sn4 IMC particles and the solid solution hardening effects which appeared, respectively, in the Ni-doped and Sb-doped alloys could increase the resistance to dislocation movement, which improves the creep properties.
► Effect of Ni and Sb on thermal and creep behavior of Sn–1.0Ag–0.5Cu alloy was assessed. ► Alloying of Ni and Sb resulted in considerably reduced undercooling and increased eutectic area. ► Enhanced creep resistance of SAC(105)Sb was due to solid solution hardening of Sb in Sn. ► Enhanced creep resistance of SAC(105)Ni was due to formation of Ni3Sn4 particles. ► The Sb-containing alloy has the highest creep resistance and longer fracture time.
