Microstructure, Texture, Mechanical and Ballistic Properties Correlation of a Hot Rolled and Peak Aged AA-7017 Alloy Plate at Surface and Centre

Abstract

The present work describes microstructure, texture, mechanical and ballistic properties correlation of a hot rolled and peak aged AA-7017 alloy plate at surface and centre. Both the microstructures and textures are different on the surface and centre of the plate. The surface of the plate shows recrystallized grains and a weak over all texture. The centre of the plate displays elongated grains and a sharp texture. Tensile properties, hardness and impact toughness are evaluated at surface and centre of the plate. It is observed that strength and hardness is high at centre, whereas ductility and impact toughness is more at the surface. Ballistic properties of the plate at centre and surface are measured by impacting against two different 7.62 mm deformable projectiles. The plates impacted on the surface shows better ballistic resistance. Ballistic performance of the plate at surface and centre has been correlated with the microstructure, texture and mechanical properties.

Effect of ceramic particles reinforcement on the ballistic resistance of friction stir processed thick AA6061 surface composite targets

“…Another is strain hardening effect, introduced by severe material deformation. 42,43 At the starting point of the entry region of the penetration channel the temperature rise is more, this leads to lesser microhardness value; after which the microhardness is very high due to strain hardening effect. In the middle region, there is a sudden fall in microhardness.…”

“…Similar variation in hardness along the penetration channel has been reported in other ballistic studies on aluminium alloys. 42,43 It is inferred from the plot that as the energy absorbed by the FSPed-G target in the entry region is very high; this leads to severe work hardening hence resulting in higher microhardness value. Also the presence of graphene has dissipated the heat in the entry region, thus generating a numerous work hardening effect.…”