Title

High-Temperature Damage-Tolerance of Coextruded, Bioinspired ("Nacre-Like"), Alumina/Nickel Compliant-Phase Ceramics

Abstract

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 °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.

Department(s)

Materials Science and Engineering

Comments

This work was supported by the Mechanical Behavior of Materials Program (KC-13) at the Lawrence Berkeley National Laboratory, funded by the U.S. Department of Energy , Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under contract no. DE-AC02-05CH11231.

Keywords and Phrases

Biomimetic Ceramics; Crack-Growth Resistance; Extrusion; High Temperature; Nacre

International Standard Serial Number (ISSN)

1359-6462

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 Acta Materialia Inc, All rights reserved.

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