| On the exceptional damage-tolerance of gradient metallic materials | |
| Cao, Ruqing1,2; Yu, Qin3; Pan, Jie1; Lin, Yan1; Sweet, Andrew3,4; Li, Yi1; Ritchie, Robert O.3,4 | |
| Corresponding Author | Li, Yi(liyi@imr.ac.cn) ; Ritchie, Robert O.(roritchie@lbl.gov) |
| 2020 | |
| Source Publication | MATERIALS TODAY
 |
| ISSN | 1369-7021 |
| Volume | 32Pages:94-107 |
| Abstract | An experimental study is described on the fracture toughness and micro-mechanisms associated with the initiation and propagation of cracks in metallic nickel containing marked gradients in grain size, ranging from similar to 30 nm to similar to 4 mu m. Specifically, cracks are grown in a gradient structured (GS) nickel with grain-size gradient ranging from the coarse macro-scale to nano-scale (CG -> NG) and vice versa (NG -> CG), with the measured crack-resistance R-curves compared to the corresponding behavior in uniform nano-grained (NG) and coarse-grained (CG) materials. It is found that the gradient structures display a much-improved combination of high strength and toughness compared to uniform grain-sized materials. However, based on J-integral measurements in the gradient materials, the crack-initiation toughness is far higher for cracks grown in the direction of the coarse-to-nano grained gradient than vice versa, a result which we ascribe primarily to excessive crack-tip blunting in the coarse-grained microstructure. Both gradient structures, however, display marked rising R-curve behavior with exceptional crack-growth toughnesses exceeding 200 MPa.m(1/2). |
| Funding Organization | U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy |
| DOI | 10.1016/j.mattod.2019.09.023 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division[DE-AC02-05-CH11231] ; National Key Research and Development Program of China[2017YFB0702003] ; National Natural Science Foundation of China[51471165] ; Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy[DE-AC02-05CH11231] |
| WOS Research Area | Materials Science |
| WOS Subject | Materials Science, Multidisciplinary |
| WOS ID | WOS:000514670500028 |
| Publisher | ELSEVIER SCI LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/137616 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Li, Yi; Ritchie, Robert O. |
| Affiliation | 1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 3.Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA 4.Lawrence Berkeley Natl Lab, Dept Mat Sci & Engn, Berkeley, CA 94720 USA |
| Recommended Citation GB/T 7714 | Cao, Ruqing,Yu, Qin,Pan, Jie,et al. On the exceptional damage-tolerance of gradient metallic materials[J]. MATERIALS TODAY,2020,32:94-107. |
| APA | Cao, Ruqing.,Yu, Qin.,Pan, Jie.,Lin, Yan.,Sweet, Andrew.,...&Ritchie, Robert O..(2020).On the exceptional damage-tolerance of gradient metallic materials.MATERIALS TODAY,32,94-107. |
| MLA | Cao, Ruqing,et al."On the exceptional damage-tolerance of gradient metallic materials".MATERIALS TODAY 32(2020):94-107. |
| Files in This Item: | There are no files associated with this item. | |||||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment