Bioinspired nacre-like alumina with a bulk-metallic glass-forming alloy as a compliant phase
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in: Nature Communications, Jahrgang 10.2019, Nr. 1, 961, 27.02.2019.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - Bioinspired nacre-like alumina with a bulk-metallic glass-forming alloy as a compliant phase
AU - Wat, Amy
AU - Lee, Je In
AU - Ryu, Chae Woo
AU - Gludovatz, Bernd
AU - Kim, Jinyeon
AU - Tomsia, Antoni P.
AU - Ishikawa, Takehiko
AU - Schmitz, Julianna
AU - Meyer, Andreas
AU - Alfreider, Markus
AU - Kiener, Daniel
AU - Park, Eun Soo
AU - Ritchie, Robert O.
PY - 2019/2/27
Y1 - 2019/2/27
N2 - 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 infiltrationtemperature 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.
AB - 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 infiltrationtemperature 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.
UR - http://www.scopus.com/inward/record.url?scp=85062283825&partnerID=8YFLogxK
U2 - 10.1038/s41467-019-08753-6
DO - 10.1038/s41467-019-08753-6
M3 - Article
VL - 10.2019
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 961
ER -
