Laboratory x-ray diffraction complex for in situ investigations of structural phase evolution of materials under gaseous atmosphere

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Abstract

In this work, a laboratory X-ray diffraction complex for in situ investigations of structural phase evolution of materials under gaseous atmosphere and elevated temperatures was developed. The approbation of the complex was carried out using a commercially pure titanium (CP-Ti) powder, zirconium (Zr-1Nb) alloy and electron beam melted Ti-6Al-4V alloy. It was established that hydrogenation of the CP-Ti powder occurred at a temperature of 500C and a hydrogen pressure of 0.5 atm, accompanied by the formation of metastable γ titanium hydride (γ-TiH) phase. The lifetime of the γ-TiH phase was 35–40 min. Decomposition of the γ-TiH occurred after reaching a temperature of 650C as a result of the thermally stimulated desorption of hydrogen. The α-Zr → δ-ZrH phase transformation was observed under hydrogenation of the zirconium Zr-1Nb alloy at a temperature of 350C and a hydrogen pressure of 0.5 atm. It was revealed that the increase in hydrogenation temperature to 450C accelerated this transformation by two times. Hydrogenation of the electron beam melted titanium Ti-6Al-4V alloy at a temperature of 650C and hydrogen pressure of 0.5 atm was accompanied by the α → α + β → β + α2 phase transformations.

Original languageEnglish
Article number447
JournalMetals
Volume10
Issue number4
DOIs
Publication statusPublished - Apr 2020

Keywords

  • Electron beam melting
  • Hydrogenation
  • In situ XRD
  • Thermal expansion coefficient
  • Titanium alloys
  • Zirconium alloy

ASJC Scopus subject areas

  • Materials Science(all)

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