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<p>In this study, lightweight and high-strength aluminum-titanium (Al-Ti) interpenetrating phase composites (IPCs) were successfully synthesized by integrating additive manufacturing with hot-pressing sintering, which overcomes the well-known issue of immiscible interface. The Ti6Al4V lattice structure acted as reinforcement of AlMgScZr alloy. A diffusion dominated interface was formed between Ti6Al4V and AlMgScZr, and no brittle phase such as Al<sub>3</sub>Ti was found. Al-Ti IPCs demonstrate an excellent combination of strength and specific energy absorption. Systematic experiments and simulations reveal two key mechanisms underlying this synergy: (1) the Ti6Al4V skeleton suppresses damage propagation, enhancing structural integrity compared to monolithic AlMgScZr alloys; (2) the AlMgScZr alloy matrix stabilizes the Ti6Al4V lattice against buckling. This work provides new insights into designing lightweight IPCs with superior mechanical performance.</p>

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Al-Ti interpenetrating phase composites with high strength and specific energy absorption fabricated by additive manufacturing and hot-pressing sintering

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Mingyang Zhang,
  • Zhangtao Li,
  • Junhao Wu,
  • Junye Li,
  • Zhun Liang,
  • Changmeng Liu,
  • Gaoyang Mi,
  • Chunming Wang,
  • Yinan Cui

摘要

In this study, lightweight and high-strength aluminum-titanium (Al-Ti) interpenetrating phase composites (IPCs) were successfully synthesized by integrating additive manufacturing with hot-pressing sintering, which overcomes the well-known issue of immiscible interface. The Ti6Al4V lattice structure acted as reinforcement of AlMgScZr alloy. A diffusion dominated interface was formed between Ti6Al4V and AlMgScZr, and no brittle phase such as Al3Ti was found. Al-Ti IPCs demonstrate an excellent combination of strength and specific energy absorption. Systematic experiments and simulations reveal two key mechanisms underlying this synergy: (1) the Ti6Al4V skeleton suppresses damage propagation, enhancing structural integrity compared to monolithic AlMgScZr alloys; (2) the AlMgScZr alloy matrix stabilizes the Ti6Al4V lattice against buckling. This work provides new insights into designing lightweight IPCs with superior mechanical performance.