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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 AuthorLi, Yi(liyi@imr.ac.cn) ; Ritchie, Robert O.(roritchie@lbl.gov)
2020
Source PublicationMATERIALS TODAY
ISSN1369-7021
Volume32Pages:94-107
AbstractAn 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 OrganizationU.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
DOI10.1016/j.mattod.2019.09.023
Indexed BySCI
Language英语
Funding ProjectU.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 AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
WOS IDWOS:000514670500028
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/137616
Collection中国科学院金属研究所
Corresponding AuthorLi, Yi; Ritchie, Robert O.
Affiliation1.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.
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