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<p>Poor ductility is the primary concern of magnesium matrix composites (MMCs). Meanwhile, improving the ductility and strength of MMCs simultaneously remains a major challenge. In this work, AZ31B alloy reinforced with TC4 particles was fabricated via friction stir processing (FSP). The microstructure of the composite was analyzed by optical microscope (OM), scanning electron microscope (SEM), energy-dispersive x-ray spectroscopy (EDS), and electron backscatter diffraction (EBSD). Microscopic observation of the TC4 particles revealed their uniform dispersion in the stir zone and the absence of any decomposition or reaction with the AZ31B matrix. A continuous and complete interface was obtained between TC4 particles and the matrix. TC4 particles underwent breakage due to severe plastic strain during FSP. The grains in the Mg matrix were refined from 13.36 to 9.3&#xa0;μm owing to dynamic recrystallization and the pinning effect of TC4 particles. TC4 particles improved the tensile behavior and assisted to retain appreciable ductility. The ultimate tensile strength of MMCs (240&#xa0;MPa) is 8&#xa0;MPa higher than that of the matrix (232&#xa0;MPa). The percentage elongation of MMCs (17.1%) is 1.1% higher than that of the matrix (16.0%). The fracture surfaces of the MMCs showed two key characteristics in dimple morphology and distribution.</p>

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Effect of TC4 Particles on Microstructure and Mechanical Properties of AZ31B Magnesium Matrix Composites Prepared through Friction Stir Processing

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Qijin Li,
  • Yang Xu,
  • Shujin Chen,
  • Junwei Lu,
  • Yuting Dai

摘要

Poor ductility is the primary concern of magnesium matrix composites (MMCs). Meanwhile, improving the ductility and strength of MMCs simultaneously remains a major challenge. In this work, AZ31B alloy reinforced with TC4 particles was fabricated via friction stir processing (FSP). The microstructure of the composite was analyzed by optical microscope (OM), scanning electron microscope (SEM), energy-dispersive x-ray spectroscopy (EDS), and electron backscatter diffraction (EBSD). Microscopic observation of the TC4 particles revealed their uniform dispersion in the stir zone and the absence of any decomposition or reaction with the AZ31B matrix. A continuous and complete interface was obtained between TC4 particles and the matrix. TC4 particles underwent breakage due to severe plastic strain during FSP. The grains in the Mg matrix were refined from 13.36 to 9.3 μm owing to dynamic recrystallization and the pinning effect of TC4 particles. TC4 particles improved the tensile behavior and assisted to retain appreciable ductility. The ultimate tensile strength of MMCs (240 MPa) is 8 MPa higher than that of the matrix (232 MPa). The percentage elongation of MMCs (17.1%) is 1.1% higher than that of the matrix (16.0%). The fracture surfaces of the MMCs showed two key characteristics in dimple morphology and distribution.