Deformation of the Shape Memory and Surface Microrelief of Ni–Fe–Ga–Co and Cu–Al–Ni Alloy Single Crystals

Abstract

We present the results of experimental studies of the return of Ni–Fe–Ga–Co and Cu–Al–Ni single crystals to the initial form at the macro- and microlevels after their deformation by compression and subsequent restorative heating. It is found that the geometric dimensions of the sample are reproduced with high accuracy (up to 20 μm). The microrelief appearing on the initially polished surface during crystal compression (the arithmetic mean profile deviation R_a ≈ 0.25–0.75 μm, the average spacing of local protrusions of the profile S ≈ 0.027–0.11 mm) is not removed by subsequent heating and remains with further multiple repetition of deformation–restoration cycles.