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<p>The aim of the present work is to determine the actual yield stress in torsion of the shape memory and superelastic Ti<sub>49.3</sub>Ni<sub>50.7</sub> (at%) alloy in the as-received state and after aging at 673&#xa0;K. The dislocation yield stress of the as-received Ti<sub>49.3</sub>Ni<sub>50.7</sub> (at%) alloy specimens under torsion is found to be <i>τ</i><sub>0.3</sub> = 460 ± 30&#xa0;MPa. In this case, the value of <i>τ</i><sub>0.3</sub> lies at the end of the pseudoyield plateau of the <i>τ</i>–<i>γ</i> dependence at the total strain <i>γ</i><sub><i>t</i></sub> = 10.0%. For the Ti<sub>49.3</sub>Ni<sub>50.7</sub> alloy specimens annealed at 673&#xa0;K for 1&#xa0;h, the dislocation yield stress in torsion reaches <i>τ</i><sub>0.3</sub> = 800 ± 10&#xa0;MPa. For these specimens, the <i>τ</i><sub>0.3</sub> position on the <i>τ</i>–<i>γ</i> dependence is at the end of the strain hardening stage at the total strain <i>γ</i><sub><i>t</i></sub> = 14.05%. Such a significant increase in <i>τ</i><sub>0.3</sub> of the specimens aged at 673&#xa0;K for 1&#xa0;h above that of the as-received specimens is due to strengthening by Ti<sub>3</sub>Ni<sub>4</sub> precipitates. It is shown that, in strengthened TiNi-based alloys, the dislocation yield stress can occur close to the end of the strain hardening stage.</p>

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Yield Stress in the Shape Memory and Superelastic Ti49.3Ni50.7 Alloy After Aging at 673 K

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • A. I. Lotkov,
  • D. Yu Zhapova,
  • A. A. Gusarenko,
  • V. N. Grishkov,
  • N. V. Girsova,
  • Yu. P. Mironov,
  • K. V. Krukovskii

摘要

The aim of the present work is to determine the actual yield stress in torsion of the shape memory and superelastic Ti49.3Ni50.7 (at%) alloy in the as-received state and after aging at 673 K. The dislocation yield stress of the as-received Ti49.3Ni50.7 (at%) alloy specimens under torsion is found to be τ0.3 = 460 ± 30 MPa. In this case, the value of τ0.3 lies at the end of the pseudoyield plateau of the τ–γ dependence at the total strain γt = 10.0%. For the Ti49.3Ni50.7 alloy specimens annealed at 673 K for 1 h, the dislocation yield stress in torsion reaches τ0.3 = 800 ± 10 MPa. For these specimens, the τ0.3 position on the τ–γ dependence is at the end of the strain hardening stage at the total strain γt = 14.05%. Such a significant increase in τ0.3 of the specimens aged at 673 K for 1 h above that of the as-received specimens is due to strengthening by Ti3Ni4 precipitates. It is shown that, in strengthened TiNi-based alloys, the dislocation yield stress can occur close to the end of the strain hardening stage.