However, since most fracture
occurs on interface between Al/filler metal, it is suggested that this mixed layer possesses reasonably high bond strength, which could be attributed to Fe-rich
IMC. The particle (mark A) observed in filler metal
layer turns out to have 36 wt pct Si and 2 wt pct Fe with balance of Al.
This result suggests that itis possible to form round type Si-rich particle due to
the silicon segregation during solidi¯cation from liquid state of filler metal.