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Soldering aluminum alloys at low temperature have great potential to avoid softening of base metals. Pure Al was soldered with pure tin assisted by ultrasound. The influence of primary α(Al) on the microstructure of Al/Sn interface and its bonding strength was studied. It is found that the primary α(Al) in liquid tin tends to be octahedron enclosed by Al {111} facet with the lowest surface free energy...
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