The research described in this contribution is focused on fractographic analysis of the fracture area of newly developed eutectic silumin type AlSi9NiCuMg0.5 (AA 4032), which was developed and patented by a team of staff of the Faculty of Mechanical Engineering. The paper presents determination of the cause of casting cracks in operating conditions. Fractographic analysis of the fracture area, identification of the structure of the casting, identification of structural components on the surface of the fracture surface and chemical analysis of the material in the area of refraction were performed within the experiment. Al-Si alloys with high specific strength, low density, and good castability are widely used in pressure-molded components for the automotive and aerospace industries. The results shown that the inter-media phases Fe-Al and Fe-Si in aluminium alloys lead to breakage across the entire casting section and a crack that crossed the entire cross section, which was confirmed by EDS analysis.
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Práce popisuje jednotlivé strukturální složky slévárenské slitiny AlSi12CuMgNi v tvářeném stavu, identifikované pomocí barevné metalografie a EDX mikroanalýzy. Výsledky jsou porovnávané s teoretickými poznatky o výskytu intermetalických sloučenin u dané slitiny.
EN
The paper refers to particular structural components of wrought aluminium casting alloy AlSi12CuMgNi which is indentify by colour metalography and EDX microanalysis. The results are compared with theoretical experience about the intermetalic phases occurence in studied alloy.
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