Scholarlink

<p>This study examines the phase transitions occurring during linear heating of the Zr15Nb alloy through a comprehensive, multi-technique methodology comprising in situ high-energy synchrotron X-ray diffraction (HEXRD), electrical resistance measurements, differential scanning calorimetry (DSC) and thermal expansion analysis, supplemented by ex situ transmission electron microscopy (TEM). The findings reveal a complex sequence of phase transformations and corresponding structural changes over a broad temperature range (from room temperature up to 800&#xa0;°C). Two distinct body-centered cubic (bcc) <i>β</i> phases <i>β</i><sub>Zr</sub> and <i>β</i><sub>Nb</sub>with closely related lattice parameters are identified. At room temperature, the microstructure is characterized by a mixture of the metastable <i>β</i><sub>Zr</sub> + <i>ω</i><sub>ath</sub> phase. Upon heating, <i>β</i><sub>Zr</sub> progressively decomposes, giving rise to the formation of <i>β</i><sub>Nb</sub>. TEM observation revealed the cuboidal shape of the <i>ω</i><sub>iso</sub> particles, resulting from the high lattice misfit between <i>β</i> and <i>ω</i> phase. The <i>ω</i> solvus temperature is determined to be approximately 555&#xa0;°C, as evidenced by in situ HEXRD and abrupt changes in the alloy’s thermal and electrical properties. The growth of the <i>α</i> phase occurs after the dissolution of the <i>ω</i> phase, resulting in a pronounced increase in thermal expansion.</p> Graphical Abstract <p></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

Phase transformations in metastable β-Zr15Nb alloy revealed by in situ methods

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月5日

查看全文
  • Anna Veverková,
  • Kristína Bartha,
  • Jozef Veselý,
  • Pere Barriobero-Vila,
  • Jiří Kozlík,
  • Petr Doležal,
  • Jiří Pospíšil,
  • Jana Šmilauerová,
  • Josef Stráský

摘要

This study examines the phase transitions occurring during linear heating of the Zr15Nb alloy through a comprehensive, multi-technique methodology comprising in situ high-energy synchrotron X-ray diffraction (HEXRD), electrical resistance measurements, differential scanning calorimetry (DSC) and thermal expansion analysis, supplemented by ex situ transmission electron microscopy (TEM). The findings reveal a complex sequence of phase transformations and corresponding structural changes over a broad temperature range (from room temperature up to 800 °C). Two distinct body-centered cubic (bcc) β phases βZr and βNbwith closely related lattice parameters are identified. At room temperature, the microstructure is characterized by a mixture of the metastable βZr + ωath phase. Upon heating, βZr progressively decomposes, giving rise to the formation of βNb. TEM observation revealed the cuboidal shape of the ωiso particles, resulting from the high lattice misfit between β and ω phase. The ω solvus temperature is determined to be approximately 555 °C, as evidenced by in situ HEXRD and abrupt changes in the alloy’s thermal and electrical properties. The growth of the α phase occurs after the dissolution of the ω phase, resulting in a pronounced increase in thermal expansion.

Graphical Abstract