Abstract
The effect of heat treatment on the structure, martensitic transformations, and properties of rapidly quenched binary titanium-enriched TiNi alloys with a shape-memory effect, which were produced by melt-spinning, has been studied using transmission and scanning electron microscopy, X-ray diffraction, and measurements of mechanical properties and electrical resistivity over a wide temperature range. Annealing of initial amorphous alloys was found to ensure their nanocrystallization with the formation of a two-phase (TiNi + Ti2Ni) nanocomposite structure. The annealing of initial submicrocrystalline alloys initiates their decomposition with the heterogeneous formation of Ti2Ni disperse particles in the supersaturated B2 austenite matrix. All alloys under study undergo a single B2 ↔ B19′ martensitic transition occurring above room temperature, exhibit high strength and plasticity, and demonstrate a narrow-hysteresis shape-memory effect.
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