Theoretical and Experimental Analysis of Formability of Explosive Welded Mg/Al Bimetallic Bars

Abstract

The paper has presented the results of theoretical studies and experimental tests of the plastic deformation of Mg/Al bimetallic specimens. Theoretical studies were carried out using the Forge2011® computer program. Physical modeling, on the other hand, was performed using the Gleeble3800 simulator. Bimetallic bars of an outer diameter of 22.5 mm and a cladding layer thickness of 1.7 mm were obtained by the explosive welding method. Samples for formability tests, characterized by a diameter-to-length ratio of 1, were taken from the bars. The theoretical studies and experimental tests were carried out for the temperature range from 300 to 400°C and for different strain rates. Based on the obtained investigation results it has been found that the main parameters influencing the formability of Mg/Al bimetallic bars are strain rate than the process temperature.

Effect of the Shape of Rolling Passes and the Temperature on the Corrosion Protection of the Mg/Al Bimetallic Bars

“…The shape of two developed groove systems is shown in Figure 3. Temperature-deformation parameters were selected based on the results of physical and numerical modelings of compression tests of two-layer Mg/Al samples [39,40]. The rolling process was conducted for two temperatures: 300 and 400 • C. After each pass, the samples were reheated to the rolling temperature.…”

“…The bimetallic feedstock was heated in the LAC KC 120/14 (LAC, Židlochovice, Czech Republic) resistance chamber furnace before rolling and before the individual passes. Temperature-deformation parameters were selected based on the results of physical and numerical modelings of compression tests of two-layer Mg/Al samples [39,40]. The rolling process was conducted for two temperatures: 300 and 400 °C.…”

Skew Rolling of Bimetallic Rods

“…However, for bimetallic parts to operate properly, they have to be made of high quality materials that can be permanently joined over the entire contact surface. Depending on the intended use and required mechanical properties, bimetallic materials can be joined by bonding, adhesive bonding, press-fitting, or shrink-fitting [2][3][4][5][6]. Bimetallic materials for the production of machine parts that carry larger loads are typically welded or fusion-welded [7][8][9][10][11].…”

The Analysis of Pressed Cups Producing Possibilities from Rolled Bimetallic Al-1050 + Cu-M1E Sheets

“…The third and final process is heat treatment. However, in the case of multilayer products, it often causes the formation of intermetallic phases (even layers), which in turn, generate microcracks or delamination of the welded materials [24][25][26][27][28][29][30][31][32][33][34]. Usually delamination of the welded materials occurs as effect of improper heat treatment [10,18,24,34].…”

“…The presented example of the implementation of Al/Cu bimetal refers to the condition where copper is the outer layer in the finished product. As mentioned above, a problem that occurs very often in the manufacturing process of multilayer products, is the occurrence of intermetallic phases [7,[9][10][11][12][13][14][15][16][17][18][19][20]25,27,[29][30][31][32][33][34]. In bimetals of the Cu/Al type, a very commonly observed phase is CuAl 2 (gray-brown area in Figure 3).…”