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Effects of Alloying in Near Eutectic Tin Silver Copper Solder Joints

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Figure

Fig. 1Schematic showing a) the specimen geometry with dimensions in mm and b) a side view of the test fixture used in the asymmetricfour-point bend tests, where x = 30 mm and y = 4 mm
Fig. 3Composite of Auger elemental mapping results for the solder matrix region of a joint made from Sn–3.6Ag–1.0Cu–0.45Co, wherethe SEM micrograph in secondary electron imaging at the lower right corner serves as the template for the elemental maps of Co,
Fig. 4Thermogram sections from differential scanning calorimetry mea-surements of the indicated alloys
Fig. 5SEM micrographs, using backscattered electron imaging, showing Cu substrate (bottom), intermetallic Cu/solder interface, andsolder matrix microstructures at moderate magnification of slowly cooled joints made from a) Sn–3.6Ag–1.0Cu, b) Sn–3.7Ag–0.9Cu,

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