Abstract
Aging temperature in the range of 300–500 °C (1 h) strongly affects transformation and mechanical behavior of Ni50.8Ti alloy wire samples obtained as a result of hot drawing at test temperatures of −196 ≤ T ≤ 60 °C. Isochronous aging of hot-deformed Ni-rich NiTi alloy forms a mixed substructure that consists of grains and subgrains, their average size increases from 0.9 to 3.3 μm vs temperature growth. In the aging range of 430–500 °C the diameter of Ti3Ni4 precipitates grows from 10–20 nm to 0.1–0.2 μm along the grain/subgrain boundaries. The widest RsM − Af temperature range (Δ76°C) of the reverse MT is revealed after aging at 300 °C; the minimal RsM − Af temperature range (Δ10°C) – after aging at 500 °C. Aging-induced microstructure strongly affects stress–temperature behavior and Young’s modulus: the obtained regularities are associated with contribution of various competing factors.
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