In this work an Aluminum matrix composite reinforced with alumina prepared by insitu
(liquid-gas) method were investigated. Gas was represented by an oxygen with flow
rate 50, 100, and 150 Sml/min (Standard mile Liter/minute) at different temperature
(720, 740, 760 and 780 °C). The effects of reaction temperature on alumina particle size
and alumina volume fraction were studied extensively. Resulted alumina was identified
by using XRD and SEM techniques. The resulted composites were characterized using
density and hardness tests. It is found generally, that the alumina particle size was (3 ± 1
μm), the density and hardness are decreases as the alumina particles weight percent
increases. The reason behind such behavior was the increment in porosity around alumina
particles and also to the weakness in wettability between alumina and metal matrix.
Furthermore, it is noted that, there are many problems need to be resolved like
segregation, agglomeration and weak of wettability are occurred between the particles
surface and matrix.