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- W2892854247 abstract "Purpose To explore substitutes for traditional Sn-Pb solder, Sn-20In-2.8Ag was considered because of its appropriate melting temperature, good reliability and high ductility at less than 100°C. However, the mechanical properties of Sn-20In-2.8Ag were not satisfactory. The reason for the poor mechanical properties of the Sn-20In-2.8Ag/Cu joint was revealed, and a way to solve the problem was found. Design/methodology/approach The microstructure evolution, characteristics of melting and solidification and joining performance with Cu were investigated using scanning electron microscopy (SEM), electron probe microanalysis, differential scanning calorimetry (DSC) and mechanical testing. Findings SEM results showed that the microstructure of Sn-20In-2.8Ag was composed of coarse dendritic Ag 2 In and γ phases, with Ag 2 In distributed at the grain boundaries. DSC measurements revealed that small amount of low temperature eutectic reaction, L → Ag 2 In + β + γ, occurred at 112.9°C. This reaction was caused by the segregation of indium, which is a process that has a strong driving force. In the lap-shear testing, a crack propagated along the grain boundary of the solder, and failure showed an intergranular fracture. This failure was connected with the three-phase eutectic and coarse Ag 2 In. Thus, to improve the mechanical properties, segregation of indium should be reduced and coarsening of Ag 2 In should be prevented. Originality/value The reason for the unsatisfactory mechanical properties of Sn-20In-2.8Ag was revealed via microstructural observations and solidification analysis, and the way to solve this problem was found." @default.
- W2892854247 created "2018-10-05" @default.
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- W2892854247 date "2019-02-18" @default.
- W2892854247 modified "2023-09-26" @default.
- W2892854247 title "Microstructure of Sn-20In-2.8Ag solder and mechanical properties of joint with Cu" @default.
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- W2892854247 doi "https://doi.org/10.1108/ssmt-12-2017-0044" @default.
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