Abstract
Al/B4C surface nano‐composite layers was achieved on commercial 7075 Al substrate employing friction stir processing technique. Agglomeration of B4C particles was occurred after a single pass. The dispersion of B4C particles was found to be affected by the number of FSP passes. A distribution of nano‐size B4C particle was achieved after four passes. Moreover, the increasing in number of FSP passes causes a decreasing in matrix grain size of the surface nano‐composite layer. The micro hardness of the surface nano‐composite layer improves by almost two times as compared to that of the as‐received substrate; this is attributed to the finer matrix grains and dispersion of nano‐sized B4C particles.
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