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<p>Adding refiners to the melts is one of the most efficient refining methods for magnesium alloys. How to improve the effectiveness of refiners was a significant issue in the Mg alloy foundry industry. Commonly used methods (e.g., electromagnetic and ultrasonic techniques) required sophisticated equipment and involve high costs. In this study, the improvement in refining effect of Al-NbB<sub>2</sub> refiner on AZ91 alloy was realized by the addition of Gd elements. The Al-NbB<sub>2</sub>-<i>x</i>Gd (x = 0, 0.3, 0.5, 0.7) refiners for AZ91 alloy were prepared by solid-liquid reaction method. Adding 0.5 wt.% Gd to the Al-NbB<sub>2</sub> refiner reduced NbB<sub>2</sub> particle size, altered its morphology (hexagonal prism → spherical polyhedron), and improved its distribution and dispersion, significantly enhancing refining performance. The Al-NbB<sub>2</sub> refiner showed better refining effects than other commonly used refiners. Compared with the refining effect of Al-NbB<sub>2</sub> refiner on AZ91, the grain refining effect of Al-NbB<sub>2</sub>-0.5Gd refiner on AZ91 alloy was enhanced by 30% (78–55&#xa0;μm). The yield strength, tensile strength and elongation were increased by 8% (74–80&#xa0;MPa), 12% (151–169&#xa0;MPa) and 12% (5.1–5.7%), respectively. The existences of NbB<sub>2</sub> and Al<sub>3</sub>Gd particles in AZ91 alloy was demonstrated using high-resolution transmission electron microscopy (HRTEM). The matching relationships between particles and α-Mg were determined using the edge-to-edge model (E2EM). The refinement mechanism of refiners in AZ91 alloy was analyzed.</p>

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Effect of Gd Addition on the Refining Properties of Refiner (Al-NbB2) for Magnesium-Aluminum Alloys

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Huanhuan Zhou,
  • Yu Bai,
  • Wenxue Fan,
  • Endian Liu,
  • Hai Hao

摘要

Adding refiners to the melts is one of the most efficient refining methods for magnesium alloys. How to improve the effectiveness of refiners was a significant issue in the Mg alloy foundry industry. Commonly used methods (e.g., electromagnetic and ultrasonic techniques) required sophisticated equipment and involve high costs. In this study, the improvement in refining effect of Al-NbB2 refiner on AZ91 alloy was realized by the addition of Gd elements. The Al-NbB2-xGd (x = 0, 0.3, 0.5, 0.7) refiners for AZ91 alloy were prepared by solid-liquid reaction method. Adding 0.5 wt.% Gd to the Al-NbB2 refiner reduced NbB2 particle size, altered its morphology (hexagonal prism → spherical polyhedron), and improved its distribution and dispersion, significantly enhancing refining performance. The Al-NbB2 refiner showed better refining effects than other commonly used refiners. Compared with the refining effect of Al-NbB2 refiner on AZ91, the grain refining effect of Al-NbB2-0.5Gd refiner on AZ91 alloy was enhanced by 30% (78–55 μm). The yield strength, tensile strength and elongation were increased by 8% (74–80 MPa), 12% (151–169 MPa) and 12% (5.1–5.7%), respectively. The existences of NbB2 and Al3Gd particles in AZ91 alloy was demonstrated using high-resolution transmission electron microscopy (HRTEM). The matching relationships between particles and α-Mg were determined using the edge-to-edge model (E2EM). The refinement mechanism of refiners in AZ91 alloy was analyzed.