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<p>To produce Mg-MMC materials effectively, production via stir casting under an argon atmosphere is increasingly being used, resulting in reduced porosity, better surface finish, and improved isotropic properties. However, there can still be issues with agglomeration for higher reinforcement loading, non-uniform structure, and cluster formation, which can limit the overall mechanical properties of the composites. This work investigates the microstructural refinement and mechanical performance of AZ91E magnesium alloy reinforced with hybrid ceramic nanoparticle systems using a semisolid stir-casting technique associated with an ultrasonic process. Alumina (50 nm) and boron carbide (30 nm) nanoparticles were incorporated at varying weight fractions to produce five sample conditions: unreinforced AZ91E, AZ91E/3 wt.% Al<sub>2</sub>O<sub>3</sub>, and hybrid composites containing 3 wt.% Al<sub>2</sub>O<sub>3</sub> with 2, 4, and 6 wt.% B<sub>4</sub>C. To enhance particle-matrix wetting, 1 wt.% magnesium fluoride (MgF<sub>2</sub>) was introduced, and argon gas was employed throughout for melt protection and degassing. The fabricated composites are subjected to microstructural, physical, and mechanical characterization. Ultrasonic-aided stir casting at 500 rpm leads to even particle distribution and superior mechanical properties. Sample 5 of AZ91E, embedded with 3% Al<sub>2</sub>O<sub>3</sub>/6% B<sub>4</sub>C, is observed to have higher thermal stability, superior tensile stress (312 MPa), optimum hardness (98.7 HV), and better impact toughness (28.4 J).</p>

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Production and Characterization of AZ91E Magnesium Alloy Hybrid Composites Reinforced with Boron Carbide and Aluminum Oxide via Advanced Semisolid Ultrasonic Stir-Casting Process

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Madaminov Sanjarbek Maxmudjon Ugli,
  • Toshit Jain,
  • D. Kanaka Mahalakshmi Devi,
  • Tarun Kapoor,
  • A. Saravanan,
  • Prateek Aggarwal,
  • Sagayaraj Pappu,
  • Ramya Maranan,
  • R. Srinivasan,
  • Anand Rajendran

摘要

To produce Mg-MMC materials effectively, production via stir casting under an argon atmosphere is increasingly being used, resulting in reduced porosity, better surface finish, and improved isotropic properties. However, there can still be issues with agglomeration for higher reinforcement loading, non-uniform structure, and cluster formation, which can limit the overall mechanical properties of the composites. This work investigates the microstructural refinement and mechanical performance of AZ91E magnesium alloy reinforced with hybrid ceramic nanoparticle systems using a semisolid stir-casting technique associated with an ultrasonic process. Alumina (50 nm) and boron carbide (30 nm) nanoparticles were incorporated at varying weight fractions to produce five sample conditions: unreinforced AZ91E, AZ91E/3 wt.% Al2O3, and hybrid composites containing 3 wt.% Al2O3 with 2, 4, and 6 wt.% B4C. To enhance particle-matrix wetting, 1 wt.% magnesium fluoride (MgF2) was introduced, and argon gas was employed throughout for melt protection and degassing. The fabricated composites are subjected to microstructural, physical, and mechanical characterization. Ultrasonic-aided stir casting at 500 rpm leads to even particle distribution and superior mechanical properties. Sample 5 of AZ91E, embedded with 3% Al2O3/6% B4C, is observed to have higher thermal stability, superior tensile stress (312 MPa), optimum hardness (98.7 HV), and better impact toughness (28.4 J).