N. N. Popov, D. V. Presnyakov, I. S. Ryzhov, A. A. Kostyleva
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Abstract—The influence of annealing at 600°C on the mechanical and thermomechanical characteristics of a Ti50Pd30Ni20 alloy with high-temperature shape memory effect (SME) is studied. The best strength (σu = 1030 ± 140 MPa) and plastic (\(\varepsilon _{0}^{{\max }}\) = 11.5 ± 6.0%, δres = 6 ± 4%) characteristics have been obtained after annealing at 600°C. The maximum thermally recoverable strain (εSME = 4.3%) and the maximum degree of shape recovery (ηSME = 67%) are achieved after annealing at 600°C after preliminary induced tensile deformation at temperatures td =235–230°C and a strain rate \(\dot {\varepsilon }\) ≈ 2.8 × 10–3 s–1; in this case, the reverse martensitic transformation temperatures characterizing the main shape recovery are AsSME = 220°C and AfSME = 249°C. Taking into account the studies carried out before, we found that the martensitic transformation temperatures increase almost linearly and, conversely, the SME and the degrees of shape recovery decrease as the titanium nickelide is alloyed with palladium in the content range from 30 to 50 at %. Linear regression equations are derived. The results obtained are used for designing safety devices of, e.g., crosscutting and pushing types.
期刊介绍：
Russian Metallurgy (Metally) publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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