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<p>In this study, the effect of vanadium (V) addition on the microstructure and heat resistance of 2519 alloy was investigated by phase diagram calculations and experiments. The addition of V leads to the formation of the primary Al<sub>10</sub>V phase, which exists in two forms: octahedral and hexagonal disk morphologies particles. TEM results show that a spherical, coherent Al<sub>18</sub>Mg<sub>3</sub>V<sub>2</sub> phase precipitates in the alloy after aging treatment. Heterogeneous nucleation of the <i>θ</i>′ phase on Al<sub>18</sub>Mg<sub>3</sub>V<sub>2</sub> phase was observed. For the first time, the orientation relationship between the Al<sub>18</sub>Mg<sub>3</sub>V<sub>2</sub> phase and the aluminum matrix was determined. The Al<sub>18</sub>Mg<sub>3</sub>V<sub>2</sub> phase demonstrated excellent thermal stability during thermal exposure, with its average size remaining at 57&#xa0;nm after 1000&#xa0;h at 250&#xa0;°C. The experimental results show that 0.3&#xa0;V alloy exhibits the highest strength at 350&#xa0;°C, 33% higher than that of the 0&#xa0;V alloy, with a tensile strength of 120&#xa0;MPa and elongation of 27.6%. The 0.1&#xa0;V alloy shows the best strength after thermal exposure at 250&#xa0;°C, with a tensile strength of 317&#xa0;MPa and elongation of 13.6%. These results indicate that V enhances the heat resistance of the 2519 alloy.</p>

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Effect of Vanadium Addition on Microstructure and Heat Resistance of 2519 Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2025年5月2日

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  • Shijie Shen,
  • Qirong Wei,
  • Gaoyong Lin,
  • Yong Jiang,
  • Jin Qin,
  • Yanchao Deng,
  • Bin Wang

摘要

In this study, the effect of vanadium (V) addition on the microstructure and heat resistance of 2519 alloy was investigated by phase diagram calculations and experiments. The addition of V leads to the formation of the primary Al10V phase, which exists in two forms: octahedral and hexagonal disk morphologies particles. TEM results show that a spherical, coherent Al18Mg3V2 phase precipitates in the alloy after aging treatment. Heterogeneous nucleation of the θ′ phase on Al18Mg3V2 phase was observed. For the first time, the orientation relationship between the Al18Mg3V2 phase and the aluminum matrix was determined. The Al18Mg3V2 phase demonstrated excellent thermal stability during thermal exposure, with its average size remaining at 57 nm after 1000 h at 250 °C. The experimental results show that 0.3 V alloy exhibits the highest strength at 350 °C, 33% higher than that of the 0 V alloy, with a tensile strength of 120 MPa and elongation of 27.6%. The 0.1 V alloy shows the best strength after thermal exposure at 250 °C, with a tensile strength of 317 MPa and elongation of 13.6%. These results indicate that V enhances the heat resistance of the 2519 alloy.