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<p>A novel ultra-high strength Ti-5Mo-5Cr-4Al-4V-2Nb (Ti-542) alloy after quasi-<i>β</i> forging was treated by solid solution-aging (STA) process. The microstructure characteristics under different STA regimes were studied. Through deformation twin inheritance and substructure recrystallization, grain refinement of <i>α</i><sub><i>p</i></sub> can be achieved. The secondary phase precipitation behaviors in grain and at grain boundary were also analyzed in detail. It is found that <i>α</i><sub>GW</sub> consistently aligns with the <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10853_2024_10534_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="51" /> </InlineMediaObject> <EquationSource Format="TEX">\(\langle {11\overline{2}0} \rangle\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">⟨</mo> <mrow> <mn>11</mn> <mover> <mn>2</mn> <mo>¯</mo> </mover> <mn>0</mn> </mrow> <mo stretchy="false">⟩</mo> </mrow> </math></EquationSource> </InlineEquation> axis of <i>α</i><sub><i>G</i></sub>, and the growth of <i>α</i><sub>GW</sub> can be divided into three categories according to the orientation of adjacent <i>β</i> grains. Moreover, the excellent strength-plasticity matching of Ti-542 alloy, with the yield strength of 1345&#xa0;MPa and the maximum strain exceeding 8% has been achieved. The fracture mechanisms with different microstructure characteristics were analyzed. The contributions of strengthening mechanisms, including fine grain strengthening, dislocation strengthening and precipitate strengthening, were systematically calculated based on strengthening models. The results will provide theoretical basis and process guidance for the microstructure design and mechanical property regulation of the new metastable <i>β</i> titanium alloy.</p>

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Microstructure regulation and mechanical properties of a newly developed ultra-high strength Ti-542 alloy

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Hengpei Pan,
  • Jinguang Li,
  • Xiao Yang,
  • Qianqian Chen,
  • Keren Zhang,
  • Mi Zhou,
  • Shengqi Feng

摘要

A novel ultra-high strength Ti-5Mo-5Cr-4Al-4V-2Nb (Ti-542) alloy after quasi-β forging was treated by solid solution-aging (STA) process. The microstructure characteristics under different STA regimes were studied. Through deformation twin inheritance and substructure recrystallization, grain refinement of αp can be achieved. The secondary phase precipitation behaviors in grain and at grain boundary were also analyzed in detail. It is found that αGW consistently aligns with the \(\langle {11\overline{2}0} \rangle\) ⟨ 11 2 ¯ 0 ⟩ axis of αG, and the growth of αGW can be divided into three categories according to the orientation of adjacent β grains. Moreover, the excellent strength-plasticity matching of Ti-542 alloy, with the yield strength of 1345 MPa and the maximum strain exceeding 8% has been achieved. The fracture mechanisms with different microstructure characteristics were analyzed. The contributions of strengthening mechanisms, including fine grain strengthening, dislocation strengthening and precipitate strengthening, were systematically calculated based on strengthening models. The results will provide theoretical basis and process guidance for the microstructure design and mechanical property regulation of the new metastable β titanium alloy.