On the exceptional damage-tolerance of gradient metallic materials

doi:10.1016/j.mattod.2019.09.023

IMR OpenIR

	On the exceptional damage-tolerance of gradient metallic materials
	Cao, Ruqing; Yu, Qin; Pan, Jie; Lin, Yan; Sweet, Andrew; Li, Yi; Ritchie, Robert O.
	2020
Source Publication	MATERIALS TODAY
Volume	32 Pages: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).
DOI	10.1016/j.mattod.2019.09.023
WOS ID	WOS:000514670500028
Citation statistics	Cited Times:10[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.imr.ac.cn/handle/321006/83282
Collection	中国科学院金属研究所
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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