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. 2017 Mar 10;7:144. doi: 10.1038/s41598-017-00157-0

Figure 2.

Figure 2

Morphologies of annealed samples with different segment lengths. FE-SEM images of the four kinds Ni/Cu samples after annealing at 700 °C for 2 h in air: (a) Ni10s/Cu60s; (b) Ni30s/Cu30s; (c) Ni90s/Cu45s and (d) Ni60s/Cu90s.