Characterization Of An Equal Channel Angular Pressed Al-Zn-In Alloy

Abstract

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.

Mechanisms of Structure Formation under Severe Plastic Deformation: A Review

“…The development of methods of severe plastic deformation (SPD) in recent years has expanded the process of evolution of metal systems up to the formation of nanostructured state. Many review papers [1-3], experimental [4][5][6][7][8][9][10][11][12][13][14][15] and theoretical papers [16][17][18] have appeared in this direction, including those using computer modelling, the authors of which, systematizing the results obtained, complementing and enriching each other, create a general picture of severe deformation of solids. Nevertheless, it should be recognized that today there is still no general physical model of matter evolution under plastic deformation.…”

Finite Element Modeling of ECAP-Linex Combined Process of Severe Plastic Deformation

“…Among the new directions in ECAP is the processing of hard-toform materials. Experimental and theoretical modeling of the mechanics of ECAP, associated with studies of the stress-strain state, contact stresses, and friction conditions, made it possible to design tooling for obtaining large-sized blanks from various metals, such as copper, titanium, tungsten, and aluminum, as well as in various alloys based on them [8][9][10][11].…”

Theoretical study of the force parameters of the ECAP-Linex combined process

“…Among the new directions in ECAP is the processing of hardto-form materials. Experimental and theoretical modeling of the mechanics of ECAP, associated with studies of the stress-strain state, contact stresses, and friction conditions, made it possible to design tooling for obtaining large-sized blanks from various metals, such as copper, titanium, tungsten, aluminum, and their numerous alloys [8][9][10][11].…”