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<p>Phase and structural transformations in near-α-titanium alloys Ti – 9Al – 4Zr – 3Sn – 5Ta – (0,15Si) under quenching and subsequent aging or tempering are investigated. Electron microscope and x-ray diffraction phase analyses are performed and compressive mechanical tests of samples of titanium alloys are conducted. The properties of the samples are compared after various modes of heat treatment. The effect of silicon addition on the structure of the alloys after quenching and aging is determined. The effect of quenching from the double-phase (α + β) range and 300-h aging at 650°C on the properties of the titanium alloys is shown to be positive. It is established that additional alloying with silicon raises the strength level after quenching due to solid-solution hardening, but aging does not raise noticeably the precipitation hardening of the alloy due to the low fraction of the precipitated silicides.</p>

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Features of Structure Formation, Phase Composition, and Properties in Near-α-Titanium Alloys of the Ti – Al – Zr – Sn – Ta – Si System

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • I. V. Narygina,
  • N. A. Popov,
  • A. S. Boyarkin,
  • K. I. Lugovaya,
  • A. A. Popov,
  • I. A. Korelin

摘要

Phase and structural transformations in near-α-titanium alloys Ti – 9Al – 4Zr – 3Sn – 5Ta – (0,15Si) under quenching and subsequent aging or tempering are investigated. Electron microscope and x-ray diffraction phase analyses are performed and compressive mechanical tests of samples of titanium alloys are conducted. The properties of the samples are compared after various modes of heat treatment. The effect of silicon addition on the structure of the alloys after quenching and aging is determined. The effect of quenching from the double-phase (α + β) range and 300-h aging at 650°C on the properties of the titanium alloys is shown to be positive. It is established that additional alloying with silicon raises the strength level after quenching due to solid-solution hardening, but aging does not raise noticeably the precipitation hardening of the alloy due to the low fraction of the precipitated silicides.