EFFECT OF SQUEEZE PRESSURE ON MICROSTRUCTURAL CHARACTERISTICS OF THE AlSi7Mg ALLOY

The paper presents the results of studies on the effect of external pressure, applied on metal during squeeze casting process, on the structure of AlSi7Mg alloy. The obtained results were completed with examinations of structure compactness and hardness tests. The specimens for tests were obtained by casting the tested AlSi7Mg alloy to a die under different pressures, i.e. 0.1 (atmoshpheric pressure), and 75 and 150 MPa, using a hydraulic press of PHM 160c type. A significant effect of pressure on the average grain size and hardness of the samples was stressed, thus demonstrating the usefulness of liquid-phase methods with application of external pressure in improvement of the properties of castings produced.

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