High-temperature damage-tolerance of coextruded, bioinspired (nacre-like), alumina/nickel compliant-phase ceramics

SCRIPTA MATERIALIA

卷:158

Article

Wilkerson, Ryan P.^1,2  Gludovatz, Bernd³  Ell, Jon^1,2  Watts, Jeremy⁴  Hilmas, Gregory E.⁴  Ritchie, Robert O.^1,2 

[1] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA

[3] UNSW Sydney, Sch Mech & Mfg Engn, Sydney, NSW 2052, Australia

[4] Missouri Univ Sci & Technol, Dept Mat Sci & Engn, Rolla, MO 65409 USA

关键词: Extrusion;    Nacre;    Biomimetic ceramics;    High temperature;    Crack-growth resistance;   

DOI  :  10.1016/j.scriptamat.2018.08.046

来源: Elsevier

【 摘 要 】

In this study, we use the coextrusion process to make high volume-fraction, nacre-like brick-and-mortar alumina structures with <10% nickel between the ceramic bricks. We perform strength and toughness tests on these compliant-phase aluminas at temperatures up to 900 degrees C, both to explore the evolution of toughening with changes in the mortar plasticity and to evaluate the viability of these materials at elevated temperatures. We find that temperature plays an important role in the mechanical performance of these materials. Specifically, we observe that crack-growth resistance can be improved at higher temperatures due to enhanced ductility in the metallic mortar. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free