Synergetic strengthening far beyond rule of mixtures in gradient structured aluminum rod

Moering, Jordan; Ma, Xiaolong; Malkin, J.; Yang, Meng; Zhu, Yuntian; Mathaudhu, Suveen

doi:10.1016/j.scriptamat.2016.05.006

Cited by 91 publications

(26 citation statements)

References 35 publications

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“…The distinct microstructural features observed at various depths of the SMRT sample indicate a formation of GNS in the depth span of 0–300 μm. The present observations are consistent with previous results obtained in other materials, such as Ni [ 6 , 36 , 37 ], Cu [ 2 , 38 ], Al alloy [ 21 , 39 ], and Ni alloy [ 12 , 40 , 41 ], subjected to surface mechanical processing.…”

Section: Resultssupporting

confidence: 93%

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Gradient Enhanced Strain Hardening and Tensile Deformability in a Gradient-Nanostructured Ni Alloy

Bao

Zhang

et al. 2021

Nanomaterials

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Gradient-nanostructured material is an emerging category of material with spatial gradients in microstructural features. The incompatibility between gradient nanostructures (GNS) in the surface layer and coarse-grained (CG) core and their roles in extra strengthening and strain hardening have been well elucidated. Nevertheless, whether similar mechanisms exist within the GNS is not clear yet. Here, interactions between nanostructured layers constituting the GNS in a Ni alloy processed by surface mechanical rolling treatment were investigated by performing unique microtension tests on the whole GNS and three subdivided nanostructured layers at specific depths, respectively. The isolated nanograined layer at the topmost surface shows the highest strength but a brittle nature. With increasing depths, isolated layers exhibit lower strength but enhanced tensile plasticity. The GNS sample’s behavior complied more with the soft isolated layer at the inner side of GNS. Furthermore, an extra strain hardening was found in the GNS sample, leading to a greater uniform elongation (>3%) as compared to all of three constituent nanostructured layers. This extra strain hardening could be ascribed to the effects of the strain gradients arising from the incompatibility associated with the depth-dependent mechanical performance of various nanostructured layers.

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Section: Resultssupporting

confidence: 93%

“…One of the critical advantages displayed by gradient metals is the unusual combinations of high strength and ductility [ 1 , 2 , 3 , 4 , 8 , 17 , 20 , 21 , 22 ]. For example, Fang et al [ 2 ] engineered a gradient variation on the surface of CG Cu by surface mechanical grinding treatment (SMGT).…”

Section: Introductionmentioning

confidence: 99%

Gradient Enhanced Strain Hardening and Tensile Deformability in a Gradient-Nanostructured Ni Alloy

Bao

Zhang

et al. 2021

Nanomaterials

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“…As a result, the tradeoff in strength and ductility can be largely alleviated. [11][12][13][14]18,19,[28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] In this article, we focus on the trans-scale GS and HLS, containing the nanograins (NG)/nanostructures (NS) and coarse grains (CG). Both the GS and HLS induce hetero deformation, which produces extraordinary strain hardening.…”

Section: Introductionmentioning

confidence: 99%

Gradient and lamellar heterostructures for superior mechanical properties

Zhu

2021

MRS Bulletin

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Heterostructured (HS) materials are a novel class of materials with mechanical properties that are superior over their conventional homogeneous counterparts. They are composed of HS zones with a dramatic difference in mechanical behaviors, which produces a synergistic effect on mechanical properties that are above the prediction by the rule-of-mixtures. Among all heterostructures, the two most studied are grain-size gradient structure and heterolamellar structure. These two heterostructures produce typical heterogeneous deformation during tensile deformation, producing long-range back stress in the soft zones and forward stress in the hard zones, which collectively produces hetero deformation-induced (HDI) stress to enhance the yield strength before yielding, and HDI hardening after yielding to retain ductility. In this article, we will focus on these two types of heterostructures. The issues, concerns, and progress are reviewed with the emphasis on the synergistic effect of mechanical properties, the fundamentals of several special plastic behaviors (e.g., strain gradient, HDI hardening and strain hardening), the plastic deformation mechanism, and the relationship between the microstructure and properties.

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“…Due to the inverted relationship between the strength and toughness of metallic materials, high strength nanostructured metals with homogeneous microstructure often exhibit poor plasticity, which seriously restricts their practical application in engineering. Recently, the concept of microstructural gradient has been increasingly applied to engineering materials [4][5][6][7][8][9][10]. Relevant research results demonstrate that gradient nanostructured materials can possess both high strength and good plasticity.…”

Section: Introductionmentioning

confidence: 99%

“…Relevant research results demonstrate that gradient nanostructured materials can possess both high strength and good plasticity. Further analysis reveals that the establishment of gradient structure can distribute stress better, and the plasticity of nanostructured metal can be improved remarkably by the coordination of strain caused by the inconsistency of plastic deformation [3,4,7]. Nevertheless, with the increasing demands of industrial development on the comprehensive properties of metals, how to thoroughly understand the effect of structural gradient on mechanical properties is a key problem when developing high-performance gradient metallic materials.…”

Section: Introductionmentioning

confidence: 99%

Grain Orientation Induced Softening in Electrodeposited Gradient Nanostructured Nickel during Cold Rolling Deformation

Wang

et al. 2020

Reviews on Advanced Materials Science

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Quantitative microstructural evolution and the corresponding microhardness of electrodeposited nanostructured nickel sheet during cold rolling deformation are investigated by x-ray diffraction, transmission electron microscopy and Vicker’s microhardness testing. Particularly, to investigate the effect of stress states on deformation behavior, two series of gradient nanostructured nickel with symmetric structures and the homogeneous counterparts with three levels of grain size are compared based on macro-statistical data. In such hierarchical sandwich-like gradient samples, the layers with larger grain size, as the soft phase, indeed sustain more deformation. Deformation-induced grain rotation changes are observed in the center layers with a relatively larger grain size, accompanied by an obvious decrease in microhardness. According to the quantitative microstructural parameters including the grain size, dislocation density and stacking fault probability before and after deformation, evaluation based on Hall-Petch and Bailey-Hirsch relationships indicates the transition from strain hardening to softening can be attributed to grain orientation change.

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Synergetic strengthening far beyond rule of mixtures in gradient structured aluminum rod

Cited by 91 publications

References 35 publications

Gradient Enhanced Strain Hardening and Tensile Deformability in a Gradient-Nanostructured Ni Alloy

Gradient Enhanced Strain Hardening and Tensile Deformability in a Gradient-Nanostructured Ni Alloy

Gradient and lamellar heterostructures for superior mechanical properties

Grain Orientation Induced Softening in Electrodeposited Gradient Nanostructured Nickel during Cold Rolling Deformation

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