Improved mechanical properties in cast Al–Si alloys by combined alloying of Fe and Cu

Influence of the chemical composition and process parameters on the mechanical properties of an extruded aluminium alloy for highly loaded structural parts

“…Analyses of the precipitated phases in these alloys carried out by various authors did not produce entirely matching results about the phases; this is attributed to the different processing conditions and the initial chemical compositions of these alloys. Thus Mrówka-Nowotnik et al [31] in a detailed investigation of as-cast AA6082 revealed that this consists of the following constituents: a-Al, ß-Al 5 FeSi, a-AlFeSi, a-Al 15 (FeMn) 3 Si, b-Al 9 Mn 3 Si, a-Al 12 Fe 3 Si, Mg 2 Si, while other authors [9][10][11][12][13][14][15][16][17] reported the presence also of a(Al 8 Fe 2 Si), ß(Al 5 FeSi), b-Al 9 Fe 2 Si 2 and p(Al 8 FeMg 3 Si 6 ) in these alloys. 3 Si or a-Al 12 (FeCr) 3 Si, which are detrimental to the mechanical properties of the alloys.…”

“…It is known that, the mechanical properties of Al alloys are also closely related to the content of alloying elements [9][10][11][12][13][14][15][16][17][18] as well as to the applied process parameters, i.e., casting, homogenization, heating, deformation parameters, heat treatments, etc., [19][20][21][22][23][24][25][26][27][28][29][30]. This means that improving the main mechanical properties of an aluminium alloy, i.e., tensile strength, yield stress, hardness and ductility, is achieved by adding alloying elements, like Mg, Si, Mn, Fe, Cr, etc., since these favour a specific morphology, crystallography and chemical composition of the intermetallic phases in the microstructure [9][10][11][12][13][14][15][16][17][18]31], on the one hand, while with the correct selection of process parameters, the desired characteristics of the intermetallic phases in terms of size, as well as their shape, fraction, distribution, etc., in the final microstructure [19][20][21][22][23][24][25][26][27][2...…”

“…This means that improving the main mechanical properties of an aluminium alloy, i.e., tensile strength, yield stress, hardness and ductility, is achieved by adding alloying elements, like Mg, Si, Mn, Fe, Cr, etc., since these favour a specific morphology, crystallography and chemical composition of the intermetallic phases in the microstructure [9][10][11][12][13][14][15][16][17][18]31], on the one hand, while with the correct selection of process parameters, the desired characteristics of the intermetallic phases in terms of size, as well as their shape, fraction, distribution, etc., in the final microstructure [19][20][21][22][23][24][25][26][27][28][29][30], can be achieved, on the other. Consequently, both strongly affect the properties of the alloy in a complex way.…”

“…3 Si or a-Al 12 (FeCr) 3 Si, which are detrimental to the mechanical properties of the alloys. Furthermore, Cu is added to impart heat treatability to the castings through the formation of the Al 2 Cu phase [9][10][11][12][13][14][15][16][17]31]. Furthermore, some authors [18] reported that Cu can contribute to increasing of strength due to formation of Q-phase (Al 5 Cu 2 Mg 8 Si 6 ).…”

Influence of cooling mode in relation to casting and extrusion parameters on mechanical properties of AA6082

“…melting, casting, homogenisation, extrusion and ageing. In every step of the manufacturing process, the chemical composition and the process parameters have a very complex influence on the final mechanical properties [3][4][5][6][7][8][9][10]. One of these steps is the homogenisation process, which is a crucial heat treatment before the extrusion process for AA production [11,12].…”