ELECTRICAL CHARACTERIZATION OF ß→α-Sn TRANSITION IN HIGH TIN CONTNET SOLDER ALLOYS WITH DIFFERENT INOCULATORS

Illés, Balázs and Skwarek, Agata and Bátorfi, Réka and Hurtony, Tamas and Harsányi, Gábor (2019) ELECTRICAL CHARACTERIZATION OF ß→α-Sn TRANSITION IN HIGH TIN CONTNET SOLDER ALLOYS WITH DIFFERENT INOCULATORS. ACTA PHYSICA POLONICA A, 134 (5). pp. 935-937. ISSN 0587-4246

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Abstract

The identification of allotropic transition of the metallic β-Sn to non-metallic α-Sn in Sn-rich solders joints is crucial for electronics working in sub-zero temperatures. This phenomenon was characterized by electrical resistance measurements in SnCu1 and Sn99Ag0.3Cu0.7 alloys inoculated with InSb, CdTe and α-Sn. Samples were stored at -18°C for 10 weeks. The transition showed characteristic differences at the different alloys and inoculators, like different nucleation, growth and the saturation stages. Although the presence of α-Sn initiates the transition faster than the other inoculators, but the higher diffusion rate of the non-tin inoculators results in much more serious destruction of the samples. The results of the electrical resistance measurements were validated with metallurgical cross-sections.

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