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

Shi, Peijian; Li, Runguang; Li, Yi; Wen, Yuebo; Zhong, Yunbo; Ren, Weili; Shen, Zhe; Zheng, Tianxiang; Peng, Jianchao; Liang, Xue; Hu, Pengfei; Min, Na; Zhang, Yong; Ren, Yang; Liaw, Peter K.; Raabe, Dierk; Wang, Yan-Dong

doi:10.1126/science.abf6986

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

Journal Article · Fri Aug 20 00:00:00 EDT 2021 · Science

DOI:https://doi.org/10.1126/science.abf6986· OSTI ID:1822835

^[1]; ^[2]; Li, Yi ^[1]; Wen, Yuebo ^[1]; ^[1]; Ren, Weili ^[1]; Shen, Zhe ^[1]; Zheng, Tianxiang ^[1]; Peng, Jianchao ^[1]; Liang, Xue ^[1]; Hu, Pengfei ^[1]; ^[1]; ^[2]; ^[3]; ^[4]; ^[5]; ^[6]

Shanghai University (China)
Univ. of Science and Technology, Beijing (China)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Univ. of Tennessee, Knoxville, TN (United States)
Max Planck Inst. fuer Eisenforschung, Düsseldorf (Germany)
Univ. of Science and Technology, Beijing (China); Northeastern University, Shenyang (China)

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. Here, 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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); National Science Foundation of China (NSFC); Funds for Creative Research Groups of China

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1822835

Journal Information:: Science, Journal Name: Science Journal Issue: 6557 Vol. 373; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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