In situ synchrotron study of electromigration induced grain rotations in Sn solder joints.

ABSTRACT: Here we report an in situ study of the early stage of microstructure evolution induced by electromigration in a Pb-free β-Sn based solder joint by synchrotron polychromatic X-ray microdiffraction. With this technique, crystal orientation evolution is monitored at intragranular levels with high spatial and angular resolution. During the entire experiment, no crystal growth is detected, and rigid grain rotation is observed only in the two grains within the current crowding region, where high density and divergence of electric current occur. Theoretical calculation indicates that the trend of electrical resistance drop still holds under the present conditions in the grain with high electrical resistivity, while the other grain with low resistivity reorients to align its a-axis more parallel w

SUBMITTER: Shen H 

PROVIDER: S-EPMC4834559 | biostudies-literature | 2016 Apr

REPOSITORIES: biostudies-literature