Scalable patterning on shape memory alloy by laser shock assisted direct imprinting

► An imprinting technique called laser shock assisted direct imprinting (LSADI) is reported, which can generate patterned indents in metallic surface without heating or etching. ► This method can be applied to any metallic surface and the patterns generated can be adjusted by changing the pattering of mask. ► This method can be easily scaled up for mass production, and it brings beneficial environmental impact since no chemicals are involved. ► LSADI has been applied to NiTi SMA in order to generate two-way shape memory effects.