Abstract
Attributing to sensitive fast scanning calorimetry, combined with focused ion beam and high resolution transmission electron microscopy, we observed the solidification structure of single Sn3.5Ag droplet quenched at controllable rate. Amorphous layers in nanometer adjacent to some Ag3Sn crystals were directly detected. Based on solid state amorphization, a nano diffusion couple between primary formed β-Sn matrix and Ag3Sn intermetallic was put forward. Quenched at 15 000 K/s, the concentration gradient in this diffusion area was up to 109 m−1, which could seriously suppress the growth and further homogeneous nucleation of Ag3Sn, leading to the formation of amorphous structure.
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