| Flaw-insensitive fracture of a micrometer-sized brittle metallic glass | |
| Qu, Ruitao1,2,3; Maass, Robert4,5; Liu, Zengqian2; Tonnies, Dominik1; Tian, Lin1; Ritchie, Robert O.6,7; Zhang, Zhefeng2; Volkert, Cynthia A.1 | |
| Corresponding Author | Zhang, Zhefeng(zhfzhang@imr.ac.cn) ; Volkert, Cynthia A.(volkert@ump.gwdg.de) |
| 2021-10-01 | |
| Source Publication | ACTA MATERIALIA
 |
| ISSN | 1359-6454 |
| Volume | 218Pages:9 |
| Abstract | 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. |
| Keyword | Metallic glass Fracture toughness Size effect Small-scale |
| Funding Organization | 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 |
| DOI | 10.1016/j.actamat.2021.117219 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 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 Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000706379300010 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/166589 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Zhang, Zhefeng; Volkert, Cynthia A. |
| Affiliation | 1.Univ Gottingen, Inst Mat Phys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany 2.Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China 3.Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, 127 West Youyi Rd, Xian 710072, Peoples R China 4.Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA 5.BAM Fed Inst Mat Res & Testing, Eichen 87, D-12205 Berlin, Germany 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 |
| Recommended Citation 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. |
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