AISI316 EDM Inconel 718 alloy T2 copper foil acoustic softening additive manufacturing aspect ratio hole bio-inspired functional surface blanking experimental bulk metallic glass chatter mark computation copper substrate critical fracture value crystal plasticity current density cut surface quality deionized water difficult-to-cut material distortion electrically assisted electrically-assisted rolling electron backscatter diffraction equal channel angular pressing fine blanking finite element analysis finite element method analysis formability forming limit forming method