On the exceptional damage-tolerance of gradient metallic materials

doi:10.1016/j.mattod.2019.09.023

CORC > 金属研究所 > 中国科学院金属研究所

	On the exceptional damage-tolerance of gradient metallic materials
	Cao, Ruqing 1,4; Yu, Qin 2; Pan, Jie 1; Lin, Yan 1; Sweet, Andrew 2,3; Li, Yi 1; Ritchie, Robert O.2,3
刊名	MATERIALS TODAY
	2020
卷号	32 页码:94-107
ISSN号	1369-7021
DOI	10.1016/j.mattod.2019.09.023
通讯作者	Li, Yi(liyi@imr.ac.cn) ; Ritchie, Robert O.(roritchie@lbl.gov)
英文摘要	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).
资助项目	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研究方向	Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000514670500028
资助机构	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
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/137615]
专题	金属研究所_中国科学院金属研究所
通讯作者	Li, Yi; Ritchie, Robert O.
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA 3.Lawrence Berkeley Natl Lab, Dept Mat Sci & Engn, Berkeley, CA 94720 USA 4.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
推荐引用方式 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.