Scholarlink

<p>In the paper, electrometric measurement, X-ray diffraction analysis, and positron lifetime spectroscopy are carried out to study changes in the structural-phase state and lattice defects of the Ti<sub>49.3</sub>Ni<sub>50.7</sub> alloy samples after quenching from 1073&#xa0;K and subsequent annealing at 573, 673, and 773&#xa0;K. After quenching, the Ti<sub>49.3</sub>Ni<sub>50.7</sub> alloy samples are in the B2-phase state with a slightly increased concentration of vacancies in the nickel sublattice. Annealing at 573&#xa0;K for 1&#xa0;h causes a highly inhomogeneous structural-phase state in the samples: the concentration of vacancies in the nickel sublattice increases (probably due to the formation of Guinier–Preston zones), and the R phase and a small amount of the Ti<sub>3</sub>Ni<sub>4</sub> phase appear. With an increase in the annealing temperature, the volume fraction of the R phase changes along a single-peaked curve, and that of the Ti<sub>3</sub>Ni<sub>4</sub> phase monotonically grows to 4%. In all samples, the scalar dislocation density <i>ρ</i><sub>d</sub> approaches the lower detection limit of the used investigation methods (~ 10<sup>12</sup>‒10<sup>13</sup>&#xa0;m<sup>−2</sup>). Based on the obtained results, it can be expected that high fatigue life and the most significant strengthening of the Ti<sub>49.3</sub>Ni<sub>50.7</sub> (at%) alloy samples may be achieved in the annealing temperature range of 523–673&#xa0;K, depending on the average size of grains–subgrains.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Changes in the Structural-Phase State of Ti49.3Ni50.7 Alloy at the Initial Stages of Aging After Quenching from the B2-Phase Homogeneity Region

  • 期刊论文

  • 发表日期：

    2026年7月29日

查看全文
  • A. Lotkov,
  • R. Laptev,
  • Y. Mironov,
  • K. Krukovskii,
  • A. Gusarenko

摘要

In the paper, electrometric measurement, X-ray diffraction analysis, and positron lifetime spectroscopy are carried out to study changes in the structural-phase state and lattice defects of the Ti49.3Ni50.7 alloy samples after quenching from 1073 K and subsequent annealing at 573, 673, and 773 K. After quenching, the Ti49.3Ni50.7 alloy samples are in the B2-phase state with a slightly increased concentration of vacancies in the nickel sublattice. Annealing at 573 K for 1 h causes a highly inhomogeneous structural-phase state in the samples: the concentration of vacancies in the nickel sublattice increases (probably due to the formation of Guinier–Preston zones), and the R phase and a small amount of the Ti3Ni4 phase appear. With an increase in the annealing temperature, the volume fraction of the R phase changes along a single-peaked curve, and that of the Ti3Ni4 phase monotonically grows to 4%. In all samples, the scalar dislocation density ρd approaches the lower detection limit of the used investigation methods (~ 1012‒1013 m−2). Based on the obtained results, it can be expected that high fatigue life and the most significant strengthening of the Ti49.3Ni50.7 (at%) alloy samples may be achieved in the annealing temperature range of 523–673 K, depending on the average size of grains–subgrains.