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<p>Functionally graded materials (FGMs), consisting of varying amounts of ceramic phases, were fabricated using the hot-pressing sintering technique, with Ti<sub>3</sub>AlC<sub>2</sub> and 2024Al as the primary constituents. Room-temperature examinations were conducted to assess the microstructural composition and mechanical properties of the composites. The effect of different ceramic contents on crack growth and the toughening mechanisms was studied. The findings indicate that the interface of the prepared gradient materials is consolidated, with no microvoids, flaws, or other defects. The Ti<sub>3</sub>AlC<sub>2</sub> particles in the matrix are distributed in a network structure, which plays a strong bridging role in load-bearing and improves the overall performance of the gradient composites. The superior fracture toughness and bending strength reached 12.99 ± 0.4&#xa0;MPa&#xa0;m<sup>1/2</sup> and 601 ± 9.8&#xa0;MPa, respectively. Compared to the average strength of Ti<sub>3</sub>AlC<sub>2</sub>/2024Al composites with 5, 10, 15, and 20 vol.% Ti<sub>3</sub>AlC<sub>2</sub>, the bending strength and fracture toughness increased by 34.1% and 11.7%, respectively. Concurrently, the Vickers hardness of the functionally graded materials exhibited a progression across the material’s gradient axis, with the top surface hardness reaching 1.81 ± 0.05 GPa. The excellent properties of Ti<sub>3</sub>AlC<sub>2</sub>/2024Al FGM can be attributed to the network distribution of Ti<sub>3</sub>AlC<sub>2</sub> and the in-situ Al<sub>3</sub>Ti, as well as the reinforcement of the matrix by the dispersive distribution of Al<sub>2</sub>Cu and the toughening of provided by the ceramic content gradient structure.</p>

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Microstructure characterization and mechanical properties of Ti3AlC2-Al3Ti/2024Al gradient composites with a laminate-reticular hierarchical structure

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Youbo Wu,
  • Zhenying Huang,
  • Wenqiang Hu,
  • Weici Zhuang,
  • Xue Li,
  • Qingwen Sun,
  • Ziqiang Zhu,
  • Ziling Liao,
  • Xin Yang,
  • Xiaohui Zhu,
  • Yang Zhou

摘要

Functionally graded materials (FGMs), consisting of varying amounts of ceramic phases, were fabricated using the hot-pressing sintering technique, with Ti3AlC2 and 2024Al as the primary constituents. Room-temperature examinations were conducted to assess the microstructural composition and mechanical properties of the composites. The effect of different ceramic contents on crack growth and the toughening mechanisms was studied. The findings indicate that the interface of the prepared gradient materials is consolidated, with no microvoids, flaws, or other defects. The Ti3AlC2 particles in the matrix are distributed in a network structure, which plays a strong bridging role in load-bearing and improves the overall performance of the gradient composites. The superior fracture toughness and bending strength reached 12.99 ± 0.4 MPa m1/2 and 601 ± 9.8 MPa, respectively. Compared to the average strength of Ti3AlC2/2024Al composites with 5, 10, 15, and 20 vol.% Ti3AlC2, the bending strength and fracture toughness increased by 34.1% and 11.7%, respectively. Concurrently, the Vickers hardness of the functionally graded materials exhibited a progression across the material’s gradient axis, with the top surface hardness reaching 1.81 ± 0.05 GPa. The excellent properties of Ti3AlC2/2024Al FGM can be attributed to the network distribution of Ti3AlC2 and the in-situ Al3Ti, as well as the reinforcement of the matrix by the dispersive distribution of Al2Cu and the toughening of provided by the ceramic content gradient structure.