Bioinspired nacre-like alumina with a bulk-metallic glass-forming alloy as a compliant phase

Amy Wat, Je In Lee, Chae Woo Ryu, Bernd Gludovatz, Jinyeon Kim, Antoni P. Tomsia, Takehiko Ishikawa, Julianna Schmitz, Andreas Meyer, Markus Alfreider, Daniel Kiener, Eun Soo Park () and Robert O. Ritchie ()
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Amy Wat: University of California
Je In Lee: Seoul National University
Chae Woo Ryu: Seoul National University
Bernd Gludovatz: UNSW Sydney
Jinyeon Kim: Seoul National University
Antoni P. Tomsia: Lawrence Berkeley National Laboratory
Takehiko Ishikawa: Japan Aerospace Explanation Agency
Julianna Schmitz: Institut für Materialphysik im Weltraum, DLR
Andreas Meyer: Institut für Materialphysik im Weltraum, DLR
Markus Alfreider: Montanuniversität Leoben
Daniel Kiener: Montanuniversität Leoben
Eun Soo Park: Seoul National University
Robert O. Ritchie: University of California

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: Abstract Bioinspired ceramics with micron-scale ceramic “bricks” bonded by a metallic “mortar” are projected to result in higher strength and toughness ceramics, but their processing is challenging as metals do not typically wet ceramics. To resolve this issue, we made alumina structures using rapid pressureless infiltration of a zirconium-based bulk-metallic glass mortar that reactively wets the surface of freeze-cast alumina preforms. The mechanical properties of the resulting Al2O3 with a glass-forming compliant-phase change with infiltration temperature and ceramic content, leading to a trade-off between flexural strength (varying from 89 to 800 MPa) and fracture toughness (varying from 4 to more than 9 MPa·m½). The high toughness levels are attributed to brick pull-out and crack deflection along the ceramic/metal interfaces. Since these mechanisms are enabled by interfacial failure rather than failure within the metallic mortar, the potential for optimizing these bioinspired materials for damage tolerance has still not been fully realized.

Date: 2019
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DOI: 10.1038/s41467-019-08753-6

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