Abstract
Aluminium alloys are one of the preferred materials especially for land and air transportation because of their high strength and lowdensity
properties. Although production using casting method is economical yet it has some disadvantages. Shrinkage which is occurred
due to the density difference between the solid and liquid metal is prevented by feeders which need to be calculated. Liquid metal should
be transferred to the mould without any turbulence. As a result, sprues are needed to be designed precisely. On the other hand, aluminium
alloys can also be shaped by forging at semi-solid temperatures. There are some advantages compared to the traditional forging methods of
improving die life due to the lower tonnage values. In this study, semi-solid produced 7075 aluminium alloy die filling capabilities were
investigated. To achieve semisolid structure strain induced melt activated method (SIMA) was used. The desired structure was achieved at
635 °C and 30 minutes of duration of heat treatment. After determining the optimum parameters, metallographic analysis, density
calculations, porosity distribution and tensile tests were carried out. It was found that the reproducibility of SIMA produced 7075 alloy
was quite low. A proper tensile test result was achieved only 7 of the total 15 tests and the mean value was 386 MPa. The main reason for
this scattered in mechanical properties could be the chemical composition of the alloy and the rapid solidification of the liquid eutectic
phases. It is important to define the best fitting process parameters and controlling them precisely will be the most important factors for
future studies.
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