Mechanical Properties of Shock Treated Aluminium Alloy Al 2024-T4

Abstract

inAbstract. Plate impact experiment has been carried out on Al 2024-T4 alloy using single stage gas gun. The dynamic yield strength and spall strength of Al 2024-T4 sample has been determined to be 0.35 GPa and 1.43 GPa, respectively, from free surface velocity history measured using VISAR. The sample recovered after unloading from peak shock pressure of 4.4 GPa along with an unshocked sample is analyzed for mechanical properties using nanoindentation and scanning electron microscopy (SEM). The nano-indentation measurements reveal that the hardness and Young's modulus for unshocked sample remains unchanged as a function of load (equivalently depth), however, the same for shocked sample decreases monotonically with increase of load up to ~40 mN and on further increase of load it remains unchanged, suggesting the (i) increase in hardness of shock loaded sample; (ii) the increase in hardness is limited to certain depth, which in our case is 845.12 ± 43.16 nm.

Response to Comment on “Adiabatic shear instability is not necessary for adhesion in cold spray”

“…We have collected experimental measurements of the spall strength for Al and its alloys from the literature [13][14][15][16][17][18][19][20][21][22][23]. Figure 2 shows the normalized critical velocity as a function of the normalized spall strength following Eq.…”