Abstract
Two extrudates made of AlSi11 alloy have been produced in the co-extrusion process: solid billet and machining chips from the rolling process. The microstructure was observed, mechanical properties were determined on the basis of the 1-axial stretch test, and the fatigue tests were performed to determine the fatigue resistance of the AlSi11 alloy.
Highlights
In Al-Si alloys, such as additives Fe, Mn and Sr have a strong influence on the fatigue properties of these materials [1]
Nicoletto et al [3] investigated the effect of temperature on the fatigue resistance of eutectic Al-Si alloys
Test specimens cut from the motor pistons were subjected to fatigue tests at ambient temperature and at 250°C, 300°C and 350°C
Summary
The AlSi11 alloy batch in the form of chips (fig. 1a) was prepared from the rolling ingot on a TUM 35 lathe without the use of a cooling agent. The AlSi11 alloy batch in the form of chips The chips were cold pressed under the pressure of 30 t to form 10 mm high and 38 mm diameter samples A bar of solid ingot was pressed. The bars produced were 8 mm in diameter. A 1-axis stretch test at ambient temperature according to EN ISO 6892-1 was performed on a Zwick/Roell Z050 strength machine. Fatigue tests were carried out on the MTS 880 endurance machine. Circular samples were subjected to cyclical loads, providing a 1axial tensile stress (sinusoidal, pulsating). The test was conducted at 10 Hz frequency and the maximum cycle. MECHANIK NR 11/2017 stress of 140 MPa (about 70% of the tensile strength). Hitachi SU-70 scanning electron microscope was used for the microstructure examinations
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