Microstructure and Properties of ZL114A Aluminum Matrix Composites Reinforced by Different Content In-situ TiB<sub>2</sub> Particles

LI Shuaiqi; GAO Zeng; LIU Shanguang; JIN Xiwei; ZHANG Zhen; NIU Jitai

doi:10.11973/jxgccl230523

Materials and Mechanical Engineering > 2024 > 48(12): 58-64. > DOI: 10.11973/jxgccl230523

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

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

1.
School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
2.
AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
3.
Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications, Beijing 100095, China

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Received Date: October 29, 2023
Revised Date: October 23, 2024

Graphical Abstract

Abstract

Abstract

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.
- in-situ TiB₂ particle,
- aluminum matrix composite,
- tensile property,
- microstructure,
- growth mechanism

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References (21)

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