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<p>Artificial materials, especially metals, exhibit mutual exclusivity in strength and toughness, posing a challenge for the design of mechanically robust yet resilient materials. This study designs a strength-toughness guided Mg-Ti6Al4V interpenetrating-phase composite (IPC) inspired by the exceptional flexibility architecture of dragonfly wings. The composite was fabricated by pressure-infiltrating pure Mg into an additively manufactured Ti6Al4V skeleton to form a dual continuous interpenetrating-phase structure. Comprehensive microstructural characterization confirmed the fabrication of a well-integrated network with uniform elemental distribution, smooth hardness gradients, and good interfacial metallurgical bonding at the interphase boundaries. <i>In-situ</i> scanning electron microscopy and X-ray computed tomography measured the real-time evolution of crack propagation, uncovering the hierarchical toughening mechanisms enabled by the bioinspired architecture. The specific energy absorption, specific stiffness, and specific strength of the IPC increased by 16%, 59%, and 43%, respectively, relative to the Mg matrix. Split Hopkinson pressure bar tests further confirmed that the IPC achieved dynamic specific strength and stiffness values that were 15% higher than those of pure Mg, despite the latter showing a stronger strain-rate sensitivity. This study provides a method for strength-toughness guided composites and offers a general strategy applicable to other high-performance artificial materials.</p>

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Additively manufactured bio-inspired structure: Strength-toughness guided Mg-Ti6Al4V interpenetrating phase composites

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Jinzhe Wang,
  • Liwu Miao,
  • Xiyu Zhang,
  • Changyi Liu,
  • Bingqian Li,
  • Siyang Gao,
  • Zhonghan Yu,
  • Kaisheng Yang,
  • Zhijie Xu,
  • Hongwei Zhao,
  • Luquan Ren

摘要

Artificial materials, especially metals, exhibit mutual exclusivity in strength and toughness, posing a challenge for the design of mechanically robust yet resilient materials. This study designs a strength-toughness guided Mg-Ti6Al4V interpenetrating-phase composite (IPC) inspired by the exceptional flexibility architecture of dragonfly wings. The composite was fabricated by pressure-infiltrating pure Mg into an additively manufactured Ti6Al4V skeleton to form a dual continuous interpenetrating-phase structure. Comprehensive microstructural characterization confirmed the fabrication of a well-integrated network with uniform elemental distribution, smooth hardness gradients, and good interfacial metallurgical bonding at the interphase boundaries. In-situ scanning electron microscopy and X-ray computed tomography measured the real-time evolution of crack propagation, uncovering the hierarchical toughening mechanisms enabled by the bioinspired architecture. The specific energy absorption, specific stiffness, and specific strength of the IPC increased by 16%, 59%, and 43%, respectively, relative to the Mg matrix. Split Hopkinson pressure bar tests further confirmed that the IPC achieved dynamic specific strength and stiffness values that were 15% higher than those of pure Mg, despite the latter showing a stronger strain-rate sensitivity. This study provides a method for strength-toughness guided composites and offers a general strategy applicable to other high-performance artificial materials.