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

doi:10.1126/science.abf6986

GSTDTAP > 气候变化

DOI	10.1126/science.abf6986
	Hierarchical crack buffering triples ductility in eutectic herringbone high-entropy alloys
	Peijian Shi; Runguang Li; Yi Li; Yuebo Wen; Yunbo Zhong; Weili Ren; Zhe Shen; Tianxiang Zheng; Jianchao Peng; Xue Liang; Pengfei Hu; Na Min; Yong Zhang; Yang Ren; Peter K. Liaw; Dierk Raabe; Yan-Dong Wang
	2021-08-20
发表期刊	Science
出版年	2021
英文摘要	Eutectic high-entropy alloys have a dual-phase structure that could be useful for optimizing a material's properties. Shi et al. found that directional solidification of an aluminum-iron-cobalt-nickel eutectic high-entropy alloy created a herringbone-patterned microstructure that was extremely resistant to fracture (see the Perspective by An). The structure contained lamellae of hard and soft phases, and the cracks that formed in the hard phase were arrested at the boundary of the soft phase. This, along with stress transfer, allowed a tripling of the maximal elongation while retaining high strength. Science , abf6986, this issue p. [912][1]; see also abk1671, p. [857][2] 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. [1]: /lookup/doi/10.1126/science.abf6986 [2]: /lookup/doi/10.1126/science.abk1671
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/336034
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Peijian Shi,Runguang Li,Yi Li,et al. Hierarchical crack buffering triples ductility in eutectic herringbone high-entropy alloys[J]. Science,2021.
APA	Peijian Shi.,Runguang Li.,Yi Li.,Yuebo Wen.,Yunbo Zhong.,...&Yan-Dong Wang.(2021).Hierarchical crack buffering triples ductility in eutectic herringbone high-entropy alloys.Science.
MLA	Peijian Shi,et al."Hierarchical crack buffering triples ductility in eutectic herringbone high-entropy alloys".Science (2021).