2012 Volume 53 Issue 9 Pages 1644-1647
TiB2p behavior was systematically studied in laser welding of A356/TiB2p metal matrix composites (MMCs). TiB2 particles encountered three different types of evolution under the direct irradiation of laser, including oxidization, escaping out of the bead and immigration in the welding pool. TiB2 particles remained solid state in the welding pool. The clusters of solid TiB2 particles were pushed into smaller clusters size and dispersive TiB2 particles by the outflow of Al plasma. After solidification, the distribution of TiB2 in the bead got more homogeneous than pre-welding. TiB2 and Al matrix bonded in strong semi-coherent relationship.