Abstract
Abstract The paper present the examination results concerning mechanical properties of castings made of AlSi7MG alloy in correlation both with the most significant squeeze casting parameters and with the modification treatment. Experiments were planned and held according to the 23 factorial design. The regression equations describing the influence of the squeeze pressure, the mould temperature, and the quantity of strontium modifier on the strength and elongation of the examined alloy were obtained. It was found that the main factor controlling the strength increase is the squeeze pressure, while the plasticity (A5) of the alloy is affected most advantageously by modification. The application of modification treatment in squeeze casting technology enables for production of the slab-type castings made of AlSi7Mg alloy exhibiting strength at the level of 230 MPa and elongation exceeding 14%.
Highlights
Squeeze casting technology belongs to the group of modern casting methods applied mostly to the aluminium alloys, which allow for production of high-quality castings with smooth surface, high dimensional accuracy and good shape fidelity, and which simultaneously are characterised by the low production costs as well as material and energy savings
The examinations were held in order to determine the relationship between mechanical properties of a slab-type casting made of the AlSi7Mg alloy and the most significant squeeze casting parameters along with the modification treatment applied during its production
Application of 23 factorial design allowed for determination of the regression equations describing the change of strength and elongation of the AlSi7Mg alloy against the changes in technological parameters of squeeze casting and modification
Summary
Squeeze casting technology belongs to the group of modern casting methods applied mostly to the aluminium alloys, which allow for production of high-quality castings with smooth surface, high dimensional accuracy and good shape fidelity, and which simultaneously are characterised by the low production costs as well as material and energy savings. Squeeze cast products exhibit high mechanical properties, which values often exceed the values reached by plastically worked elements. The strengthening of cast alloys results here from the fine grain structure formed under the conditions of pressure applied during the solidification [3,4,5,6,7]. During the solidification of a squeeze cast item there occurs an increase in the growth rate of the α solid solution dendrites as well as the rise in the volume percentage of this phase in the structure. The examinations were held in order to determine the relationship between mechanical properties of a slab-type casting made of the AlSi7Mg alloy and the most significant squeeze casting parameters (i.e. the pressure and the temperature of the mould) along with the modification treatment applied during its production. The initial optimization of variables was performed on the basis of the 23 factorial design
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