Dr. Najim A. Saad, Dr. Alaa A. Ateia, Awham J. Salman
الملخص الانجليزي
This paper provides an overview of the mechanical properties of reinforced Al-
12%Si alloy by uni-directional of the eutectic phases in specific direction. A special
solidification unit have been designed and manufactured to ensure the correct
orientation of growing eutectic phase. Two types of insulation materials have been
used to isolate the carbon steel mold of solidification unit, (dry sand and glass wool).
The second type insulator found to be favorable in augmenting the growth and unidirection
of eutectic phase with the conditions of cold water flow through the unit.
The produced microstructure consists of little elongated α-phase with a noticeable
correct orientation of the growing discontinuous eutectic phase in the direction of heat
sink. Hardness, tension, compression and impact properties have improved in
comparison with the samples of free mold isolation case (i.e. free solidification).
These results reflect directly the effect of uni-directional growth of eutectic phase in
the reinforcement process of the investigated alloy as an in situ-composite material.
تاريخ النشر
01/01/2010
الناشر
The Iraqi Journal For Mechanical And Material Engineering