English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Hierarchical crack buffering triples ductility in eutectic herringbone high-entropy alloys

MPS-Authors
/persons/resource/persons125330

Raabe,  Dierk
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

External Resource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Shi, P., Li, R., Li, Y., Wen, Y., Zhong, Y., Ren, W., et al. (2021). Hierarchical crack buffering triples ductility in eutectic herringbone high-entropy alloys. Science, 373(6557), 912-918. doi:10.1126/science.abf6986.


Cite as: http://hdl.handle.net/21.11116/0000-0009-4673-7
Abstract
In human-made malleable materials, microdamage such as cracking usually limits material lifetime. Some biological composites, such as bone, have hierarchical microstructures that tolerate cracks but cannot withstand high elongation. We demonstrate a directionally solidified eutectic high-entropy alloy (EHEA) that successfully reconciles crack tolerance and high elongation. The solidified alloy has a hierarchically organized herringbone structure that enables bionic-inspired hierarchical crack buffering. This effect guides stable, persistent crystallographic nucleation and growth of multiple microcracks in abundant poor-deformability microstructures. Hierarchical buffering by adjacent dynamic strain–hardened features helps the cracks to avoid catastrophic growth and percolation. Our self-buffering herringbone material yields an ultrahigh uniform tensile elongation (~50), three times that of conventional nonbuffering EHEAs, without sacrificing strength. © 2021 American Association for the Advancement of Science. All rights reserved.