fig23

Figure 23. Atomic structures of nanopolycrystalline (A and D) Zn, (B and E) Mg, and (C and F) Be, corresponding to the peak stress (A-C) and stable stress (D and E). Note: Strains for A2/B2/C2 are 5.3%, 6.2%, and 7.5%; strains for A4/B4/C4 are 15.0%. The red, green, blue, and white atoms represent HCP, FCC, BCC, and other structures, respectively. HCP: Hexagonal close-packed; FCC: face-centered cubic; BCC: body-centered cubic.