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    LI Shuaiqi, GAO Zeng, LIU Shanguang, JIN Xiwei, ZHANG Zhen, NIU Jitai. Microstructure and Properties of ZL114A Aluminum Matrix Composites Reinforced by Different Content In-situ TiB2 Particles[J]. Materials and Mechanical Engineering, 2024, 48(12): 58-64. DOI: 10.11973/jxgccl230523
    Citation: LI Shuaiqi, GAO Zeng, LIU Shanguang, JIN Xiwei, ZHANG Zhen, NIU Jitai. Microstructure and Properties of ZL114A Aluminum Matrix Composites Reinforced by Different Content In-situ TiB2 Particles[J]. Materials and Mechanical Engineering, 2024, 48(12): 58-64. DOI: 10.11973/jxgccl230523

    Microstructure and Properties of ZL114A Aluminum Matrix Composites Reinforced by Different Content In-situ TiB2 Particles

    • With ZL114A alloy as matrix, ZL114A aluminum matrix composites reinforced by in-situ TiB2 particles with different mass fractions (3%, 6%, 9%) were prepared by mixed salt reaction method. The microstructure and tensile properties of composites were studied, and the growth mechanism of TiB2 in the matrix was analyzed. The results show that the main phases of the composites were Al, Si and TiB2 phases, indicating that the in-situ TiB2 particle reinforced ZL114A aluminum matrix composites were successfully prepared. With the increase of TiB2 content, the grains of the matrix were refined and spheroidized, the eutectic silicon was obviously refined and its morphology changed from coarse long strip to short rod. The in-situ TiB2 particles increased the strength and plasticity of the composite, and the fracture mode changed from brittle fracture of ZL114A alloy to mixed ductile-brittle fracture. With the increase of TiB2 content, the tensile strength and percentage elongation after fracture first increased and then decreased, and reached the maximum when the mass fraction of TiB2 was 6%, which were 237.4 MPa and 6.7%, respectively. During the preparation process of the composites, a nearly spherical TiB2 core was first precipitated from the matrix. With the growth of the spherical core, a small plane was formed on the surface of the spherical core, and finally the typical TiB2 morphology of the hexagonal platform combination was formed.
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