Flaw-insensitive fracture of a micrometer-sized brittle metallic glass

doi:10.1016/j.actamat.2021.117219

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	Flaw-insensitive fracture of a micrometer-sized brittle metallic glass
	Qu, Ruitao 2,3,4; Maass, Robert 1,5; Liu, Zengqian 3; Tonnies, Dominik 2; Tian, Lin 2; Ritchie, Robert O.6,7; Zhang, Zhefeng 3; Volkert, Cynthia A.2
刊名	ACTA MATERIALIA
	2021-10-01
卷号	218 页码:9
关键词	Metallic glass Fracture toughness Size effect Small-scale
ISSN号	1359-6454
DOI	10.1016/j.actamat.2021.117219
通讯作者	Zhang, Zhefeng(zhfzhang@imr.ac.cn) ; Volkert, Cynthia A.(volkert@ump.gwdg.de)
英文摘要	Brittle materials, such as oxide glasses, are usually very sensitive to flaws, giving rise to a macroscopic fracture strength that is much lower than that predicted by theory. The same applies to metallic glasses (MGs), with the important difference that these glasses can exhibit certain plastic strain prior to catastrophic failure. Here we consider the strongest metallic alloy known, a ternary Co55Ta10B35 MG. We show that this macroscopically brittle glass is flaw-insensitive at the micrometer scale. This discovery emerges when testing pre-cracked specimens with self-similar geometries, where the fracture stress does not decrease with increasing pre-crack size. The fracture toughness of this ultra-strong glassy alloy is further shown to increase with increasing sample size. Both these findings deviate from our classical understanding of fracture mechanics, and are attributed to a transition from toughness-controlled to strength-controlled fracture below a critical sample size. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
资助项目	National Natural Science Foundation of China (NSFC)[51771205] ; Alexander von Humboldt (AvH) Foundation ; U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division[DE-AC02-05CH11231] ; Department of Materials Science and Engineering at UIUC ; KC Wong Education Foundation[GJTD-2020-09]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000706379300010
资助机构	National Natural Science Foundation of China (NSFC) ; Alexander von Humboldt (AvH) Foundation ; U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division ; Department of Materials Science and Engineering at UIUC ; KC Wong Education Foundation
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/166588]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang, Zhefeng; Volkert, Cynthia A.
作者单位	1.BAM Fed Inst Mat Res & Testing, Eichen 87, D-12205 Berlin, Germany 2.Univ Gottingen, Inst Mat Phys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany 3.Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China 4.Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, 127 West Youyi Rd, Xian 710072, Peoples R China 5.Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA 6.Univ Calif Berkeley, Mat Sci Div, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA 7.Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA
推荐引用方式 GB/T 7714	Qu, Ruitao,Maass, Robert,Liu, Zengqian,et al. Flaw-insensitive fracture of a micrometer-sized brittle metallic glass[J]. ACTA MATERIALIA,2021,218:9.
APA	Qu, Ruitao.,Maass, Robert.,Liu, Zengqian.,Tonnies, Dominik.,Tian, Lin.,...&Volkert, Cynthia A..(2021).Flaw-insensitive fracture of a micrometer-sized brittle metallic glass.ACTA MATERIALIA,218,9.
MLA	Qu, Ruitao,et al."Flaw-insensitive fracture of a micrometer-sized brittle metallic glass".ACTA MATERIALIA 218(2021):9.