Formation of Two-Way Shape Memory Effect in Rapid-Quenched TiNiCu Alloys
Moscow Engineering Physics Institute, Dep. of Solid State Physics, Kashirskoe shosse 31, 115409 Moscow, Russia
2 A.A. Baikov Institute of Metallurgy, Russian Academy of Sciences, Leninsky Prospect 49, 117911 Moscow, Russia
Recently we have developed a number of devices for an optical radiation control based on the shape memory effect. A blind of rapid-quenched TiNiCu alloy having a two-way shape memory in bending was used as a basic element. So far as the rapid quenched alloy used is amorphous in initial state, it needs thermal annealing to form shape memory. This paper describes procedure of thermo-mechanical treatment, that allows to form desired two-way shape memory immediately during thermal annealing of amorphous alloy without training. It was shown that degree of two-way shape recovery depends critically on initial strain, temperature and duration of the annealing. It was experimentally determined optimum parameters of thermo-mechanical treatment to achieve maximum two-way shape memory.
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