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Robust Cellular Shape-Memory Ceramics via Gradient‐Controlled Freeze Casting

Zeng, Xiaomei and Arai, Noriaki and Faber, Katherine T. (2019) Robust Cellular Shape-Memory Ceramics via Gradient‐Controlled Freeze Casting. Advanced Engineering Materials, 21 (12). Art. No. 1900398. ISSN 1438-1656. doi:10.1002/adem.201900398.

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Shape‐memory ceramics offer promise for applications like actuation and energy damping, due to their unique properties of high specific strength, high ductility, light weight and inertness in harsh environments. To date, shape‐memory behavior in ceramics is limited to micro/submicro‐scale pillars and particles to circumvent the longstanding problem of transformation‐induced fracture which occurs readily in bulk polycrystalline specimens. The challenge, therefore, lies in the realization of shape‐memory properties in bulk ceramics, which requires careful design of three‐dimensional structures that locally mimic pillar structures. In this work, it is demonstrated that with a gradient‐controlled freeze‐casting approach, honeycomb‐like cellular structures can be fabricated with thin and directionally aligned walls to facilitate martensitic transformation under compression without fracture. With this approach, robust bulk shape‐memory ceramics have been demonstrated in a highly porous structure with strengths under compressive stresses of 25 MPa and strains up to 7.5%.

Item Type:Article
Related URLs:
URLURL TypeDescription
Arai, Noriaki0000-0002-3040-2997
Faber, Katherine T.0000-0001-6585-2536
Additional Information:© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Issue Online: 19 December 2019; Version of Record online: 23 September 2019; Accepted manuscript online: 31 August 2019; Manuscript revised: 16 August 2019; Manuscript received: 11 April 2019. Funding Information: Resnick Sustainability Institute at Caltech; National Science Foundation. Grant Number: DMR-1411218.
Group:Resnick Sustainability Institute
Funding AgencyGrant Number
Resnick Sustainability InstituteUNSPECIFIED
Subject Keywords:cellular structures; ice templating; martensitic transformation; porous ceramics; shape‐memory ceramics
Issue or Number:12
Record Number:CaltechAUTHORS:20190904-112355921
Persistent URL:
Official Citation:Zeng, X., Arai, N. and Faber, K.T. (2019), Robust Cellular Shape‐Memory Ceramics via Gradient‐Controlled Freeze Casting. Adv. Eng. Mater., 21: 1900398. doi:10.1002/adem.201900398
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98411
Deposited By: Tony Diaz
Deposited On:04 Sep 2019 21:01
Last Modified:16 Nov 2021 17:38

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