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Figure 1.  Effect of Mn content on (a) RDFs and (b) atomic volume of CoCrFeNiMn_x HEA at a temperature of 1 K.

Figure 2.  The elastic modulus of CoCrFeNiMn_x HEA at a temperature of 1 K. (a) C₁₁, (b) C₁₂, (c) C₄₄. The results of CoCrFeNiMn₂₀ HEA are compared with those of Thürmer et al. in Ref. [22].

Figure 3.  Schematic diagram of the shock response of the HEA.

Figure 4.  Position–time (x–t) diagrams for shock compression and release in the CoCrFeNiMn₂₀ HEA sample at U_p = 1200 m⋅s⁻¹. (a) Shock pressure, (b) temperature, and (c) atomic volume.

Figure 5.  Shock profiles from MD simulations of CoCrFeNiMn_x HEA at U_p = 1200 m⋅s⁻¹. Profiles correspond to 15 ps after the initial piston compression. (a) Shock pressure P_xx, (b) shear stress P_sh, and (c) temperature T.

Figure 6.  Shock Hugoniot data (a) U_p–U_s and (b) P–V/V₀ of CoCrFeNiMn_x HEA. The dotted lines in panel (a) are linear fit to the MD results. The dotted lines in panel (b) are calculation Hugoniot curves using Eq. (3).

Figure 7.  The evolution of P_xx profiles for CoCrFeNi HEA sample at U_p = 1200 m⋅s⁻¹ during the spallation process.

Figure 8.  Free surface velocity histories of (a) CoCrFeNiMn₂₀ HEA at various U_p and (b) CoCrFeNiMn_x HEA at U_p = 1200 m⋅s⁻¹.

Figure 9.  Shock-induced spall strength of CoCrFeNiMn HEAs versus strain rate from this work and references by Li et al.,^[17] Thürmer et al.,^[16,22] Zhang et al.,^[13] and Xie et al.^[32]

Figure 10.  Atomic fraction of FCC, BCC, HCP and disordered structures as a function of time: (a) U_p = 800 m⋅s⁻¹, (b) U_p = 1200 m⋅s⁻¹, (c) U_p = 1600 m⋅s⁻¹.

Figure 11.  Snapshots of shock-induced structural changes of CoCrFeNiMn_x HEA. (a)–(c) U_p = 800 m⋅s⁻¹, (d)–(f) U_p = 1200 m⋅s⁻¹, (g)–(i) U_p = 1600 m⋅s⁻¹.

Figure 12.  Evolution of dislocation density as a function of time: (a) U_p = 800 m⋅s⁻¹, (b) U_p = 1200 m⋅s⁻¹, and (c) U_p = 1600 m⋅s⁻¹. (d) Dislocation distribution for different U_p and Mn contents at 15 ps.