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<p>The purpose of the work is to investigate the microstructure, phase composition and elemental composition of the weld obtained by electron beam welding of two Ti-6Al-4 and Ti-3Al-5&#xa0;V-5Mo titanium alloys. The research methods are the X-ray diffraction analysis, transmission and scanning electron microscopy using energy-dispersion analysis and diffraction of backscattered electrons. It was found that in the fusion zone of the welded joint the Ti-3Al-5&#xa0;V-3Mo alloy is formed with the prior anisotropic shape <i>β</i>-grains and nanocrystalline <i>α′</i>-martensitic internal microstructure. The penetration of Mo into the fusion zone leads to the reduction of the <i>α′</i>-martensite lath transverse dimensions of up to 76&#xa0;nm and the formation of the <i>α″</i>-phase with a volume fraction of up to 6%. The microhardness of the fusion zone is increased compared to the base metal zones. This is due to the grain boundary contribution from the nanocrystalline structure, the elastic micro-stress contribution in the laths with transverse dimensions equal 40&#xa0;nm, and the solid solution contribution to hardening due to an increase in Mo concentration in the fusion zone. </p>

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Formation of the α″-Phase in the Electron Beam Weld of α + β Dissimilar Titanium Alloys

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • O. B. Perevalova,
  • A. V. Panin,
  • M. S. Kazachenok

摘要

The purpose of the work is to investigate the microstructure, phase composition and elemental composition of the weld obtained by electron beam welding of two Ti-6Al-4 and Ti-3Al-5 V-5Mo titanium alloys. The research methods are the X-ray diffraction analysis, transmission and scanning electron microscopy using energy-dispersion analysis and diffraction of backscattered electrons. It was found that in the fusion zone of the welded joint the Ti-3Al-5 V-3Mo alloy is formed with the prior anisotropic shape β-grains and nanocrystalline α′-martensitic internal microstructure. The penetration of Mo into the fusion zone leads to the reduction of the α′-martensite lath transverse dimensions of up to 76 nm and the formation of the α″-phase with a volume fraction of up to 6%. The microhardness of the fusion zone is increased compared to the base metal zones. This is due to the grain boundary contribution from the nanocrystalline structure, the elastic micro-stress contribution in the laths with transverse dimensions equal 40 nm, and the solid solution contribution to hardening due to an increase in Mo concentration in the fusion zone.