Effect of ECAP on microstructure and mechanical properties of a commercial 6061 Al alloy produced by powder metallurgy

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

“…However, our model is consistent with the observations on PM CP Al if we take l g =120nm, which is achieved for instance for f=0.05 and r=3nm. Our model is also consistent with the observations for PM Al-6061 for l g =600nm, which is achieved for instance for f=0.05 and r=15nm (r is taken from TEM data in [102]). These values for f and r values are realistic and consistent with the limited available data, which indicates that our model is also consistent with grain refinement in PM Al alloys.…”

“…From this data it is especially interesting to discuss a commercial purity (CP) powder metallurgical (PM) Al material cold deformed to an equivalent strain of about 1.4 [101] for which a refined grain size of about 400nm was a achieved and a PM Al-6061 for which a 500nm grain size was obtained after ECAP to a strain of about 4 [102]. Both of these grain sizes are substantially smaller than comparable alloys produced by conventional casting and subsequently subjected to SPD.…”

Influence of Die Angles on the Microhardness of Aluminum Alloy Processed by Equal Channel Angular Pressing

“…This shows that the structure yields an equal amount of strain throughout the whole workpiece. This result is in consistent with the results obtained by Chang et al [24] and Shin et al [25] on 6061 Al alloys. : Vickers microhardness from the bottom to the top of the Al-Si workpiece at two locations for 4 passes through the die with Φ =120 0 and Ψ =0 0 on the X and Y planes.…”

Tensile deformation characteristics of a nano-structured 5083 Al alloy

“…Cylindrical samples of φ 18 mm × 130 mm were prepared from the extruded bar, as starting materials for ECAP, followed by annealing at 723 K for 1 h. The starting materials showed the average grain size of approximately 200 m. The ECAP of eight passes was carried out using route C and a press speed of 2 mm s −1 at 373 and 473 K that selected for the restraint of recrystallization and much formation of high angle grain boundaries during ECAP [9], respectively. In addition, some samples were annealed at 473 K for 1 h after ECAP at 373 K. Much information for ECAP adopted in this study has been listed in previous reports [9][10][11][12][13]. Tensile tests were carried out using the tensile specimens with 25 mm in gauge length at the initial strain rate of 1.00 × 10 −3 s −1 at room temperature.…”