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<p>In this study, the Al–7Si–0.35&#xa0;Mg alloy was subjected to refinement and modification treatment using Al–3Ti–4.35La master alloy combined with rare earth neodymium (Nd), and synergistically treated with T6 heat treatment (solid solution at 510&#xa0;°C for 4&#xa0;h + aging at 165&#xa0;°C for 3&#xa0;h). The influence of collaborative processing on the microstructure and mechanical properties of alloys was systematically studied. The results show that the Ti<sub>2</sub>Al<sub>20</sub>La phase can significantly refine the α-Al dendrites, and the synergistic effect of Nd and La effectively regulates the morphology, size and growth mechanism of eutectic Si. After T6 treatment, the eutectic Si is fully spheroidized, and the β″ strengthening precipitates are uniformly and dispersedly distributed. Ultimately, after T6 treatment, the tensile strength, elongation and microhardness of the alloy reach 275.7&#xa0;MPa, 13.6% and 94.2 HV, respectively, indicating a significant improvement in mechanical properties.</p> Graphical abstract <p></p>

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Study on synergistic regulation of microstructure and mechanical properties of Al–7Si–0.35 Mg alloy by simultaneous addition of (Al–3Ti–4.35La + Nd) master alloy and T6 heat treatment

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Wan-Wu Ding,
  • Rong-Jie Mu,
  • Mei Xu,
  • Chu-Yu Wu,
  • Cheng-Liang Yang,
  • Jia-Zhi An

摘要

In this study, the Al–7Si–0.35 Mg alloy was subjected to refinement and modification treatment using Al–3Ti–4.35La master alloy combined with rare earth neodymium (Nd), and synergistically treated with T6 heat treatment (solid solution at 510 °C for 4 h + aging at 165 °C for 3 h). The influence of collaborative processing on the microstructure and mechanical properties of alloys was systematically studied. The results show that the Ti2Al20La phase can significantly refine the α-Al dendrites, and the synergistic effect of Nd and La effectively regulates the morphology, size and growth mechanism of eutectic Si. After T6 treatment, the eutectic Si is fully spheroidized, and the β″ strengthening precipitates are uniformly and dispersedly distributed. Ultimately, after T6 treatment, the tensile strength, elongation and microhardness of the alloy reach 275.7 MPa, 13.6% and 94.2 HV, respectively, indicating a significant improvement in mechanical properties.

Graphical abstract