Plastic deformation mechanism of polycrystalline copper foil shocked with femtosecond laser

- Plastic deformation mechanism of fs laser shocked copper has been characterized.
- Under low strain, stacking faults (SFs) act as complementary deformation mode.
- With increasing strain, twins and SFs act as important deformation mechanism.
- Twins connecting with twin or SFs is the result of SFs overlapping.
- Strain produces more dislocation. Twins relate with strain rate and pressure more.