Fig. 1. Schematic of laser shock dynamic compaction

Fig. 2. Scanning electron microscopy (SEM) images of different forms of copper powder. (a) Irregular copper powder；(b)(c) spherical copper powder with different diameters

Fig. 3. Drawing of pretreated and final copper powder compacts. (a) Macro morphologies; (b) enlarged local morphologies

Fig. 4. Cross-section morphologies of copper powder compact under different laser energy values. (a) Edge area; (b) central area

Fig. 5. Effect of laser energy on relative density of copper powder compact

Fig. 6. Macro morphologies of compacts of copper powder with different forms . (a) Irregular copper powder; (b) small spherical copper powder; (c) large spherical copper powder

Fig. 7. Microstructures of cross-section of different compacts. (a)(d) Irregular copper powder compact; (b)(e) small spherical copper powder compact; (c)(f) large spherical copper powder compact

Fig. 8. Effect of copper powder form on relative density of compacts

Fig. 9. Microhardness distribution of irregular copper powder compact under different laser energy values

Fig. 10. Effect of multiple impact on copper powder compact. (a) Effect of impact frequency on relative density; (b) effect of the second impact energy on relative density (keep the first impact energy at 360 mJ); (c) effect of the first impact energy on relative density (keep the second impact energy at 1800 mJ)