Iranian Journal of Materials Science and Engineering

Abstract:

structures in alloys. This method is based on pouring the melt through a small sized nozzle into a mould located at a

certain height under the crucible. This simple method generates globular structures without using equipments such as

impellers, electromagnetic stirrers, ultrasonic probes and cooling slopes. Therefore it is cost effective. In the present

study, the effect of casting size and mould casting modulus on the globular structure evolution in A356 aluminium alloy

specimens prepared by NMS process was investigated. The results showed that regardless of the different casting

modulus and their sizes, all the specimens exhibited globular structures. However, the size and shape factor of the

globules decreased with increased casting modulus and casting size indicating the influential effect of the surface area

of the mould in generating globular structures in this process.