Shape memory effect of spherical indentation in NiTi alloys

Abstract

Spherical indentation of an equiatomic nickel titanium shape memory alloy was conducted. The depth profile measured with a laser confocal microscope revealed that the indentation is accompanied with “sink-in” volume, which can exhibit nearly perfect shape memory effect. The depth of sink-in is as large as the half or the depth of indentation and thus cannot be ignored.