TEM observation of stress-induced martensite after nanoindentation of pseudoelastic Ti_(50)Ni_(48)Fe_2

摘要

In the present study we show that stress-induced martensite forms during nanoindentation of a pseudoelastic shape memory alloy of type Ti_(50)Ni_(48)Fe_2. For this purpose, we performed nanoindentation experiments using a specimen which was prepared for subsequent investigation in a transmission electron microscope (TEM). A Berkovich nanoindentation experiment into the thin part of the TEM specimen and subsequent post-mortem TEM analysis (bright field and selected area diffraction) showed that B19' forms close to the center of the indent (distance d from the center of the indent <2 mu m). Further out (2 mu m