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<p>This study investigates the synthesis, phase evolution, and densification of the Ti–6Al–2Sn–4Zr–6Mo (Ti-6246) alloy produced by the Hydride Cycle (HC) method as an energy-efficient solid-state alternative to conventional melting routes. The alloy was synthesized using hydride precursors obtained by self-propagating high-temperature synthesis, followed by vacuum dehydrogenation–sintering and an additional hydrogenation–(dehydrogenation–sintering) cycle. X-ray diffraction and differential thermal analysis confirmed the formation of a compositionally consistent (α + β) alloy at 1050&#xa0;°C, significantly below the melting point of molybdenum (2623&#xa0;°C). SEM/EDS analysis and elemental mapping demonstrated a generally uniform distribution of alloying elements at the examined scale and confirmed the absence of large-scale segregation. The hydrogenation–(dehydrogenation–sintering) cycle promoted phase re-equilibration within the two-phase (α + β) microstructure and significantly enhanced densification, resulting in a relative density of approximately 99%. The as-synthesized alloy exhibited high microhardness values up to 403.2 HV, associated with the refined non-equilibrium microstructure. The more equilibrated microstructure of the cycled alloy was accompanied by a reduction in microhardness despite the improved densification. The results demonstrate that the HC method provides a streamlined and compositionally controlled solid-state route for processing complex titanium alloys.</p>

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Energy-efficient hydride cycle synthesis of Ti-6Al-2Sn-4Zr-6Mo alloy: microstructure and densification

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Anahit Aleksanyan,
  • Gayane Chilingaryan,
  • Davit Mayilyan

摘要

This study investigates the synthesis, phase evolution, and densification of the Ti–6Al–2Sn–4Zr–6Mo (Ti-6246) alloy produced by the Hydride Cycle (HC) method as an energy-efficient solid-state alternative to conventional melting routes. The alloy was synthesized using hydride precursors obtained by self-propagating high-temperature synthesis, followed by vacuum dehydrogenation–sintering and an additional hydrogenation–(dehydrogenation–sintering) cycle. X-ray diffraction and differential thermal analysis confirmed the formation of a compositionally consistent (α + β) alloy at 1050 °C, significantly below the melting point of molybdenum (2623 °C). SEM/EDS analysis and elemental mapping demonstrated a generally uniform distribution of alloying elements at the examined scale and confirmed the absence of large-scale segregation. The hydrogenation–(dehydrogenation–sintering) cycle promoted phase re-equilibration within the two-phase (α + β) microstructure and significantly enhanced densification, resulting in a relative density of approximately 99%. The as-synthesized alloy exhibited high microhardness values up to 403.2 HV, associated with the refined non-equilibrium microstructure. The more equilibrated microstructure of the cycled alloy was accompanied by a reduction in microhardness despite the improved densification. The results demonstrate that the HC method provides a streamlined and compositionally controlled solid-state route for processing complex titanium alloys.