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<p>Titanium alloys are extensively employed in high-end manufacturing sectors such as aerospace and biomedical applications because of their low density, high specific strength, and excellent corrosion resistance. However, the inherent trade-off between strength and plasticity remains a critical bottleneck constraining the development of high-performance titanium alloys. This study focuses on a novel <i>β</i>-rich <i>α</i> + <i>β</i> titanium alloy, Ti-6Al-4&#xa0;V-2Mo-2Fe (Ti6422), and conducts the first systematic investigation based on powder metallurgy processing, with emphasis on elucidating the regulatory mechanism of aging cooling rate on microstructural evolution and synergistic strength-plasticity performance. The results show that the heat treatment protocol involving solution treatment at 850°C for 2&#xa0;h and aging at 600°C for 6&#xa0;h followed by furnace cooling (FC) enables the alloy to achieve exceptional comprehensive mechanical properties: ultimate tensile strength of 1405&#xa0;MPa, yield strength of 1339&#xa0;MPa, and elongation of 10.2%. Slow cooling significantly promotes the precipitation and growth of acicular <i>α</i><sub>s</sub>, with the <i>α</i>-phase volume fraction reaching 77% and an average grain size of 3.82&#xa0;<i>μ</i>m. By regulating the quantity ratio and morphological characteristics of <i>α</i><sub>s</sub> and primary <i>α</i> phases, a dual-phase microstructure with a multiscale heterogeneous structure is effectively constructed, which substantially enhances strength while maintaining plasticity, thereby breaking through the conventional strength-plasticity trade-off limitation of titanium alloys. This study not only establishes a heat treatment strategy for powder metallurgy Ti6422 alloy that combines high strength, good plasticity, and cost advantages but also provides process guidance for the subsequent development of broader <i>β</i>-rich titanium alloy systems.</p>

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Heat Treatment of Powder Metallurgy Ti-6Al-4V-2Mo-2Fe Alloy: Microstructural Evolution and Resulting Mechanical Properties

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Zhenhong Du,
  • Shangxing Qiu,
  • Fang Yang,
  • Yuping Dong,
  • Kehan Liu,
  • Xin Li,
  • Hao Pan,
  • Xinbo He,
  • Cunguang Chen,
  • Zhimeng Guo,
  • Xinhua Liu

摘要

Titanium alloys are extensively employed in high-end manufacturing sectors such as aerospace and biomedical applications because of their low density, high specific strength, and excellent corrosion resistance. However, the inherent trade-off between strength and plasticity remains a critical bottleneck constraining the development of high-performance titanium alloys. This study focuses on a novel β-rich α + β titanium alloy, Ti-6Al-4 V-2Mo-2Fe (Ti6422), and conducts the first systematic investigation based on powder metallurgy processing, with emphasis on elucidating the regulatory mechanism of aging cooling rate on microstructural evolution and synergistic strength-plasticity performance. The results show that the heat treatment protocol involving solution treatment at 850°C for 2 h and aging at 600°C for 6 h followed by furnace cooling (FC) enables the alloy to achieve exceptional comprehensive mechanical properties: ultimate tensile strength of 1405 MPa, yield strength of 1339 MPa, and elongation of 10.2%. Slow cooling significantly promotes the precipitation and growth of acicular αs, with the α-phase volume fraction reaching 77% and an average grain size of 3.82 μm. By regulating the quantity ratio and morphological characteristics of αs and primary α phases, a dual-phase microstructure with a multiscale heterogeneous structure is effectively constructed, which substantially enhances strength while maintaining plasticity, thereby breaking through the conventional strength-plasticity trade-off limitation of titanium alloys. This study not only establishes a heat treatment strategy for powder metallurgy Ti6422 alloy that combines high strength, good plasticity, and cost advantages but also provides process guidance for the subsequent development of broader β-rich titanium alloy systems.