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<p>Nowadays, aluminum matrix composites (AMCs) have garnered significant attention across various industries due to their unique properties, such as high specific strength and modulus, low density, and excellent wear resistance. The in situ technique is one of the modern methods for fabricating AMCs, where the reinforcing phase is generated within the matrix. This study investigates the microstructure and mechanical properties of Al5083-TiB<sub>2</sub> nanocomposites produced via the stir casting process. In this method, KBF<sub>6</sub> and K<sub>2</sub>TiF<sub>6</sub> salts were added to molten Al5083. The mixture was stirred for initial durations of 5 and 10&#xa0;min and held for 20, 30, and 40&#xa0;min before being poured into a metallic mold. To achieve better dispersion of the reinforcement particles, a secondary stirring step of 10&#xa0;min was applied in some samples. Hot extrusion was employed to enhance the properties of the cast specimens. The formation, distribution, and morphology of the reinforcement particles were analyzed using x-ray diffraction (XRD), scanning electron microscopy (SEM), and field emission scanning electron microscopy (FE-SEM). The results revealed that the optimal processing parameters 5&#xa0;min of initial stirring, 40&#xa0;min of holding time, and 10&#xa0;min of secondary stirring resulted in the formation of the desired TiB<sub>2</sub> phase without the formation of the detrimental Al<sub>3</sub>Ti phase. Furthermore, alloying elements were added to certain samples to enhance mechanical properties. The results showed that the addition of magnesium increased the tensile strength from 200 to 355&#xa0;MPa and the elongation from 16 to 18%, compared to non-alloyed samples. In the sample alloyed with zirconium, a significant improvement was observed with a tensile strength of 426&#xa0;MPa and an elongation of 32%.</p>

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Fabrication and Mechanical Characterization of Al5083-TiB2 Nanocomposite via Stir Casting Using KBF4 and K2TiF6 Salts through In Situ Reaction in Al5083 Melt

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Ali Alizadeh,
  • Zahra Rasoulzadeh,
  • Mohsen Heydari Beni,
  • Jafar Eskandari Jam,
  • Majid Eskandari Shahraki,
  • Alireza Asadolahei

摘要

Nowadays, aluminum matrix composites (AMCs) have garnered significant attention across various industries due to their unique properties, such as high specific strength and modulus, low density, and excellent wear resistance. The in situ technique is one of the modern methods for fabricating AMCs, where the reinforcing phase is generated within the matrix. This study investigates the microstructure and mechanical properties of Al5083-TiB2 nanocomposites produced via the stir casting process. In this method, KBF6 and K2TiF6 salts were added to molten Al5083. The mixture was stirred for initial durations of 5 and 10 min and held for 20, 30, and 40 min before being poured into a metallic mold. To achieve better dispersion of the reinforcement particles, a secondary stirring step of 10 min was applied in some samples. Hot extrusion was employed to enhance the properties of the cast specimens. The formation, distribution, and morphology of the reinforcement particles were analyzed using x-ray diffraction (XRD), scanning electron microscopy (SEM), and field emission scanning electron microscopy (FE-SEM). The results revealed that the optimal processing parameters 5 min of initial stirring, 40 min of holding time, and 10 min of secondary stirring resulted in the formation of the desired TiB2 phase without the formation of the detrimental Al3Ti phase. Furthermore, alloying elements were added to certain samples to enhance mechanical properties. The results showed that the addition of magnesium increased the tensile strength from 200 to 355 MPa and the elongation from 16 to 18%, compared to non-alloyed samples. In the sample alloyed with zirconium, a significant improvement was observed with a tensile strength of 426 MPa and an elongation of 32%.