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<p>Comprehensive studies on the influence of hafnium concentration in the range from 2.7 to 5.3 at % on the mechanical and thermomechanical characteristics of the properties of Ni–Ti–Hf alloys with high-temperature shape memory effect on samples made of strips with a thickness from 1.9 to 2.46 mm after high-temperature annealing in vacuum are carried out. For the specified alloys, high mean values of strength (σ<sub>B</sub>&#xa0;= 1030 MPa) and plasticity (δ<sub>res</sub> from 38 to 29%) characteristics are obtained. By means of annealing in vacuum and the selection of conditions for inducing deformation, it becomes possible to obtain thermomechanical characteristics that meet the requirements for creating safety devices for nuclear power facilities: temperatures of the beginning and end of shape recovery above 100°C (<i>A</i><sub>s SME</sub> from 117 ± 4 to 131 ± 4°C, <i>A</i><sub>f SME</sub> from 139&#xa0;±&#xa0;4 to 150 ± 3°C), a fairly narrow range of shape recovery temperatures (|<i>A</i><sub>s SME</sub>–<i>A</i><sub>f SME</sub>| = 20 ± 1°C), the value of thermally reversible deformation during the manifestation of the SME of more than 3% (ε<sub>SME</sub> from 3.2 ± 0.2 to 4.3 ± 0.9%), the degree of shape recovery of more than 40% (η<sub>SME</sub> from 38 ± 3 to 54 ± 13%).</p>

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Influence of Hafnium Concentration on Mechanical and Thermomechanical Characteristics of Ni–Ti–Hf System Alloys with High-Temperature Shape Memory Effect

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • N. N. Popov,
  • D. A. Kaydarov,
  • D. V. Presnyakov,
  • T. A. Morozova,
  • A. A. Kostyleva

摘要

Comprehensive studies on the influence of hafnium concentration in the range from 2.7 to 5.3 at % on the mechanical and thermomechanical characteristics of the properties of Ni–Ti–Hf alloys with high-temperature shape memory effect on samples made of strips with a thickness from 1.9 to 2.46 mm after high-temperature annealing in vacuum are carried out. For the specified alloys, high mean values of strength (σB = 1030 MPa) and plasticity (δres from 38 to 29%) characteristics are obtained. By means of annealing in vacuum and the selection of conditions for inducing deformation, it becomes possible to obtain thermomechanical characteristics that meet the requirements for creating safety devices for nuclear power facilities: temperatures of the beginning and end of shape recovery above 100°C (As SME from 117 ± 4 to 131 ± 4°C, Af SME from 139 ± 4 to 150 ± 3°C), a fairly narrow range of shape recovery temperatures (|As SME–Af SME| = 20 ± 1°C), the value of thermally reversible deformation during the manifestation of the SME of more than 3% (εSME from 3.2 ± 0.2 to 4.3 ± 0.9%), the degree of shape recovery of more than 40% (ηSME from 38 ± 3 to 54 ± 13%).