The influence of the structure on the fatigue properties of aluminium alloys for the casting

Abstract

The article will be focused on monitoring the influence of the structure on the fatigue properties of Al-Mg cast alloy. As an experimental material were used aluminium alloys EN AC 51200 and EN AC 51500, supplied in a cast state without a heat treatment, which were produced by the continuous casting method. These alloys were selected on the basis of the chemical composition, where the content of most alloying elements is comparable. Fatigue properties of aluminium alloys were tested by three-point bending cyclic loading. The fracture surface of the testing sample was examined using scanning electron microscopy (SEM), where samples were observed on various stages of the fatigue process, their characteristics and differences of fracture surfaces.

Archives of Metallurgy and Materials

“…The low frequency fatigue tests were carried out according to STN 42 0362 by means of the fatigue experimental machine Zwick/Roell Amsler 150HFP 5100. The equipment uses the resonance principle with constant or variable amplitude and mean load [15][16]. The fatigue tests were realised at sinusoidal cyclic push-pull loading (stress ratio R = -1) in the high cycle fatigue region (from 10 5 to 10 7 cycles) at frequency f ≈ 120 Hz.…”