Abstract
The magnetic-field dependence of microstructure and property of Ag-Sn solder alloys (Ag100-xSnx, x = 0, 19.5, 49.6, 96.2, 100) has been investigated by experiment. The viscosity of the alloys increases with decreasing temperature and x. Magnetic-field enhanced viscosity, largest for pure Ag while smallest for Ag50.4Sn49.6. The magnetic-field induced viscosity ηB is inversely proportional to the electrical resistivity Ω of melts, both of which are affected by the constitution of clusters in melts. Under magnetic field, the surface structure of alloy ingot is refined, the segregation is reduced, the grain size is refined, and most important the wettability is increased.
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