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<p>The A356-TiB<sub>2</sub> in-situ composites discs with varying TiB₂ reinforcement levels (1–4 wt.%) were fabricated using a flux-assisted salt route assisted by high shear mixing and vertical centrifugal casting. XRD analysis confirmed the formation of in-situ TiB<sub>2</sub> without the traces of intermediate phases. Microstructural observations of artificial ageing treated (T6) composites revealed significant refinement and spheroidization of eutectic Si with increasing TiB<sub>2</sub> content. A uniform dispersion of TiB<sub>2</sub> particles with minimal agglomeration was achieved at 3 wt.% reinforcement. The high shear process effectively fragmented the agglomerates and ensured uniform distribution of TiB<sub>2</sub>, resulting in enhanced Mg<sub>2</sub>Si precipitation and aging kinetics. Mechanical testing demonstrated that the 3 wt.% composite exhibited the highest hardness (142 BHN), an improvement of tensile strength by ~ 29% and superior wear resistance (up to 56.8% reduction in wear rate) compared to base alloy.</p>

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Effect of T6 treatment on in-situ A356-TiB2 composites disc fabricated by high shear mixing and centrifugal casting processes

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Sunil Manani,
  • Nidhi Sindhu,
  • T. P. D. Rajan,
  • R. K. Goyal,
  • Sreekumar Vadakke Madam

摘要

The A356-TiB2 in-situ composites discs with varying TiB₂ reinforcement levels (1–4 wt.%) were fabricated using a flux-assisted salt route assisted by high shear mixing and vertical centrifugal casting. XRD analysis confirmed the formation of in-situ TiB2 without the traces of intermediate phases. Microstructural observations of artificial ageing treated (T6) composites revealed significant refinement and spheroidization of eutectic Si with increasing TiB2 content. A uniform dispersion of TiB2 particles with minimal agglomeration was achieved at 3 wt.% reinforcement. The high shear process effectively fragmented the agglomerates and ensured uniform distribution of TiB2, resulting in enhanced Mg2Si precipitation and aging kinetics. Mechanical testing demonstrated that the 3 wt.% composite exhibited the highest hardness (142 BHN), an improvement of tensile strength by ~ 29% and superior wear resistance (up to 56.8% reduction in wear rate) compared to base alloy.