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<p>An aluminum matrix composite with enhanced high-temperature strength and modulus is developed in this study using powder metallurgy, incorporating high-energy ball milling-controlled in-situ reactions between the Ti<sub>2</sub>AlC (MAX phase) precursor and aluminum (Al) matrix. High-energy ball milling induces a dual-pathway elemental diffusion architecture in Ti<sub>2</sub>AlC, enabling the internal decomposition mechanism in Ti<sub>2</sub>AlC and producing a hierarchical microstructure. This structure contains (1) 0.42 μm and 38.6 vol.% Al<sub>3</sub>Ti particles uniformly dispersed in the Al matrix (0.32 μm), and (2) intraparticle carbon-contained clusters and rod-like phases (2–100 nm), enhancing Al<sub>3</sub>Ti strength. This multi-level architecture achieves high strength and stiffness at elevated temperatures, with ultimate tensile strength values of 632 MPa (room temperature) and 246 MPa (350 °C) and corresponding Young’s modulus values of 124 GPa and 106 GPa, respectively. At 350 °C, the specific modulus of the composite surpasses that of Ti (TC4), Cu (QZr0.2), steel (45 steel), and Ni (GH93) by 88%, 190%, 55%, and 42%, respectively, which positions it as a competitive candidate for lightweight structural materials in high-temperature applications.</p>

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Hierarchical reinforcement strategy enables aluminum matrix composites with uncompromised high-temperature mechanical properties

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月13日

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  • H. J. Hu,
  • Y. H. Shi,
  • Y. N. Zan,
  • M. Song,
  • D. Wang,
  • Q. Z. Wang,
  • L. H. He,
  • W. Yin,
  • B. L. Xiao,
  • Z. Y. Ma

摘要

An aluminum matrix composite with enhanced high-temperature strength and modulus is developed in this study using powder metallurgy, incorporating high-energy ball milling-controlled in-situ reactions between the Ti2AlC (MAX phase) precursor and aluminum (Al) matrix. High-energy ball milling induces a dual-pathway elemental diffusion architecture in Ti2AlC, enabling the internal decomposition mechanism in Ti2AlC and producing a hierarchical microstructure. This structure contains (1) 0.42 μm and 38.6 vol.% Al3Ti particles uniformly dispersed in the Al matrix (0.32 μm), and (2) intraparticle carbon-contained clusters and rod-like phases (2–100 nm), enhancing Al3Ti strength. This multi-level architecture achieves high strength and stiffness at elevated temperatures, with ultimate tensile strength values of 632 MPa (room temperature) and 246 MPa (350 °C) and corresponding Young’s modulus values of 124 GPa and 106 GPa, respectively. At 350 °C, the specific modulus of the composite surpasses that of Ti (TC4), Cu (QZr0.2), steel (45 steel), and Ni (GH93) by 88%, 190%, 55%, and 42%, respectively, which positions it as a competitive candidate for lightweight structural materials in high-temperature applications.