Dr. Mustafa Ahmed Rijab /assistant prof.
Technical Institute -Baquba / Mechanical Department
The aim of this research is to investigate the effect of addition of pure titanium ( 0.05
and 0.1 ) % on the microstructure of AL – 12% Si alloy , And the effect of long term
homogenization (552 Co ) on the microstructure development .
The microstructure result showed that the addition of (0.05)% Ti exhibited a partial
modification on the structure , addition of (0.1) % Ti to the alloy showed a marked effect on
the modification . Also the results showed that the transformation of silicon (Si) from needle
or fibrous shape to spheriodal shape was observed during homogenization of the alloys . the
spheriodal shape of silicon (Si) particles was obtained via five different stages . these stages
are growth , fragmentation , spheriodization , growth and steady state of spheriodized silicon
(Si) respectively .