Mechanical and microstructural properties of 2024-T351 aluminium using a hat-shaped specimen at high strain rates

Dynamic Shear Deformation of a Precipitation Hardened Al_0.7CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry

“…The smaller particles aligning in the shear flow direction are suggested as fragmentation of second phase particles inside the ASB leading to the formation of the rigid walls of the shear band. EDS of the larger second phase particles showed their composition to be different from that of the matrix material [19]. In the current work on examining the region outside the ASB as shown in Figure 6(d), we notice that the L12 phase within fcc has disordered and the presence of high density of nano-twins.…”

“…Note, that even though we see the fragmentation of the lamellae (highlighted by a yellow color arrow in Al map in the figure) at some places but the compositional heterogeneity is maintained even within the ASB. Edwards et al studied the shear deformation using hat shaped specimen on a 2024 Al alloy [19]. They showed that the high-temperature generated with the formation of ASB caused the second phase particles to coalesce and resulted in a slightly smoother dissolution surface on the particles.…”

“…Therefore, a detailed investigation of the microstructural evolution of ASB in metallic materials before and after impact loading tests is desirable [12,13]. Hat-shaped specimens, commonly referred to as top hat specimens, have been widely used to study the dynamic deformation behavior under shear loading [14][15][16][17][18][19][20][21][22][23][24] using split-Hopkinson pressure bar (SHPB) apparatus. This sample geometry promotes shear localization resulting in deformation focused in a narrow shear band (~ 2-50 µ m wide).…”

“…(2) Dynamic recrystallization (DRX) is observed in most the tested materials including copper [16], steel [17,18], pure titanium [15], titanium alloys [14,18], and aluminum alloy [19]. The shear texture is also observed in low-nickel-containing steel [17], pure titanium [15], and nickel alloy [20].…”

Dynamic Shear Deformation of a Precipitation Hardened Al0.7CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry

“…Therefore, a detailed investigation of the microstructural evolution of ASB in metallic materials before and after impact loading tests is desirable [ 12 , 13 ]. Hat-shaped specimens, commonly referred to as top hat specimens, have been widely used to study the dynamic deformation behavior under shear loading [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ] using split-Hopkinson pressure bar (SHPB) apparatus. This sample geometry promotes shear localization resulting in deformation focused in a narrow shear band (2–50 µm wide).…”