Damage-tolerant architected materials inspired by crystal microstructure
File(s)
Accepted version
Author(s)
Pham, Minh Son
Liu, Chen
Todd, Iain
Lertthanasarn, Jedsada
Type
Journal Article
Abstract
Architected materials that consist of periodic arrangements of nodes and struts are lightweight and can exhibit combinations of properties (such as negative Poisson ratios) that do not occur in conventional solids. Architected materials reported previously are usually constructed from identical ‘unit cells’ arranged so that they all have the same orientation. As a result, when loaded beyond the yield point, localized bands of high stress emerge, causing catastrophic collapse of the mechanical strength of the material. This ‘post-yielding collapse’ is analogous to the rapid decreases in stress associated with dislocation slip in metallic single crystals. Here we use the hardening mechanisms found in crystalline materials to develop architected materials that are robust and damage-tolerant, by mimicking the microscale structure of crystalline materials—such as grain boundaries, precipitates and phases. The crystal-inspired mesoscale structures in our architected materials are as important for their mechanical properties as are crystallographic microstructures in metallic alloys. Our approach combines the hardening principles of metallurgy and architected materials, enabling the design of materials with desired properties.
Date Issued
2019-01-17
Date Acceptance
2018-11-29
Citation
Nature, 2019, 565 (7739), pp.305-311
ISSN
0028-0836
Publisher
Nature Research
Start Page
305
End Page
311
Journal / Book Title
Nature
Volume
565
Issue
7739
Copyright Statement
© 2019 Springer Nature Limited. All rights reserved. The final publication is available at via https://dx.doi.org/10.1038/s41586-018-0850-3
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000455781600031&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
AISI 316L
DEFORMATION
BEHAVIOR
EVOLUTION
COPPER
Publication Status
Published
Date Publish Online
2019-01-16