Preparation of Y-A1203 nanocrystallites by SOL-GEL auto combustion process and production of A1-A1203 aluminum matrix composites. by Ahmad @ Ayob, Mansor, Shameli, Kamyar, Khorrami, Saeid Abedini, Lotfi, Roshanak, Sedaghat, Sajjad, Shabanzadeh, Parvaneh, Bagchesara, Mohammad Amin