Effect of high magnetic field on the morphology of (Cu, Ni)_6Sn_5 at Sn0.3Ni/Cu interface

摘要

The effect of high magnetic field on the microstructure of (Cu, Ni)_6Sn_5 intermetallic compound layer in Sn0.3Ni/Cu couples at 250 ℃ was examined. The applied magnetic field changed the morphology of outer (Cu, Ni)_6Sn_5 crystals on the Sn side from faceted shape to stick shape. The high magnetic field affected the crystal orientations of (Cu, Ni)_6Sn_5 and reduced the Ni content in the outer layer. The morphology evolution of (Cu, Ni)_6Sn_5 is attributed to the content of Ni solute decreased by magnetic field. The effects of high magnetic field on the liquid convection and phase diagram are considered to be responsible for the Ni content.