Equal channel angular pressing (ECAP) is a technique that creates a high accumulated strain in metals and results in ultrafine-grained structure. In this study, Al-5Zn-0.02In was processed by ECAP at a room temperature using route Bc through an ECAP die (press angle of Φ = 100• and Ψ = 20 • ). The samples were subjected to ECAP with 1, 2, 3 and 4 passes. The processed specimens were characterized using electron backscatter diffraction (EBSD). The results confirmed the grain refinement of the alloy after ECAP to an average grain size less than 5 µm after 4-pass ECAP. The microhardness test shows that the hardness increased with the number of passes. The hardness of the cross-sectional area of the sample was similar to that tested along the pressing direction.Keywords: Aluminum alloys, Equal channel angular pressing, Severe plastic deformation, Electron backscatter diffraction Metoda przeciskania w kanale kątowym (ang. Equal channel angular pressing; ECAP) prowadzi do powstania bardzo wysokich naprężeń, w wyniku czego otrzymuje się ziarna o bardzo drobnej strukturze. W niniejszej pracy, stop Al-5Zn-0,02In wytwarzano metodą ECAP w temperaturze pokojowej, wykorzystując ścieżkę Bc przez matrycę ECAP (kąty krzywizny: Φ = 100• i Ψ = 20 • ). Próbki poddano ECAP z 1, 2, 3 i 4 przejściami. Otrzymane próbki badano metodą dyfrakcji elektronów wstecznie rozproszonych (ang. electron back scatter diffraction; EBSD). W stopie otrzymanym metodą ECAP z 4 przejściami, średnia wielkość ziaren wynosiła mniej niż 5 µm. Badania mikrotwardości wykazały, że twardość zwiększała się wraz z liczbą przejść. Twardość zmierzona w poprzek próbki byłą porównywalna do tej mierzonej wzdłuż osi nacisku.
Equal channel angular pressing (ECAP) is one of severe plastic deformation (SPD) techniques that gives a high level of strain and eventually results in ultrafine-grained structure. This research aims to study the effects of passes on equal channel angular pressing of 6061 aluminium alloy. The samples were subjected to ECAP using route Bc with 1, 2, 3, and 4 passes. The processed samples were characterized using a variety of techniques: Optical Microscopy (OM); Scanning Electron Microscopy (SEM) equipped with Energy Dispersive X-ray (EDX); and Electron Back Scatter Diffraction (EBSD). The results showed that ECAP had a large influence on misorientation and size of grains but little effects on precipitates. The 4-pass ECAP led to a high fraction of low-angle boundaries and led to a nearly 97% increase of hardness.
This research aims to investigate the influence of production conditions on the quality of aluminium casting with open-cell aluminium foam core. Open-cell aluminium foams were produced using vacuum pressure to aid molten metal to be fill into space of water-soluble space holders to obtain aluminum foams with specific pore sizes. The produced foams were then used as cores for castings. Optical microscope was employed for determination of the final cast product structure. Results indicate that open-cell aluminum foam can be successfully used as a core for casting without pore intrusion by molten metal. However, the quality of final cast products depends significantly on preheat and pouring temperature conditions. Possible optimal conditions for good quality castings were suggested.
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