Cyclic strain amplitude-dependent fatigue mechanism of gradient nanograined Cu

Pan, Qingsong; Long, Jianzhou; Jing, Lijun; Tao, Nengguo; Lü, Lei

doi:10.1016/j.actamat.2020.06.047

Cited by 21 publications

(12 citation statements)

References 40 publications

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“…22,23 Under cyclic loading, the cyclic elastic and plastic strains are spatially inhomogeneous but smoothly graded, thereby delocalizing deformation with controlled homogeneous or abnormal grain coarsening. 56 This results in a combination of both lowcycle and high-cycle fatigue resistance that is not achieved in their homogeneous NC counterparts. [56][57][58] The improved crack propagation resistance arises from crack tip blunting in the CG and more homogeneous stress field with the lower stress concentration ahead of the crack tip in the gradient structure.…”

Section: Fatigue and Fracture Of Nanocrystalline Metals And Alloysmentioning

confidence: 99%

“…56 This results in a combination of both lowcycle and high-cycle fatigue resistance that is not achieved in their homogeneous NC counterparts. [56][57][58] The improved crack propagation resistance arises from crack tip blunting in the CG and more homogeneous stress field with the lower stress concentration ahead of the crack tip in the gradient structure. 59,60 In summary, both engineering the spatial distribution of nanostructure and altering heterogeneous GB chemistry and structure by alloying are effective in enhancing the resistance to fatigue and fracture.…”

Section: Fatigue and Fracture Of Nanocrystalline Metals And Alloysmentioning

confidence: 99%

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Fatigue and fracture of nanostructured metals and alloys

et al. 2021

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Metals and alloys with nanoscale structural features (such as grain size or twin thickness <100 nm) exhibit exceptional strength and unusual deformation mechanisms. But, the suppressed dislocation slip, grain-boundary instability, and limited strain hardening in these nanostructured metals can be detrimental to fatigue and fracture properties. In this article, recent advances in understanding the structural origins of fatigue and fracture resistance of nanocrystalline and nanotwinned metals and alloys are reviewed. Based on this understanding, microstructural engineering strategies, such as gradient grain size, controlled boundary mobility, or hierarchical nanotwins, alter the deformation modes and provide promising paths to develop nanostructured materials with improved fatigue and fracture properties.

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Section: Fatigue and Fracture Of Nanocrystalline Metals And Alloysmentioning

confidence: 99%

Section: Fatigue and Fracture Of Nanocrystalline Metals And Alloysmentioning

confidence: 99%

Fatigue and fracture of nanostructured metals and alloys

et al. 2021

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“…Such superior ductility primarily originates from the progressive plastic yielding from the core to surface of the gradient nanostructures, which induces the activation of 2 of 9 novel deformation mechanisms [1]. For instance, a mechanically driven GB migration process with grain coarsening in either homogeneous or abnormal mode dominates the plastic deformation of the gradient NG Cu under tension and cyclic deformation [8,[13][14][15]. Nevertheless, as for conventional nanosized grains with high-density GBs, structural coarsening inevitably results in the mechanical softening under external mechanical stimuli, which is detrimental to the continuous property increment and technological applications [1,8,16].…”

Section: Introductionmentioning

confidence: 99%

Superior Strength and Ductility of 304 Austenitic Stainless Steel with Gradient Dislocations

et al. 2021

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Materials with designed gradient nanograins exhibit unprecedented mechanical properties, such as superior strength and ductility. In this study, a heterostructured 304 stainless steel with solely gradient dislocation structure (GDS) in micron-sized grains produced by cyclic-torsion processing was demonstrated to exhibit a substantially improved yield strength with slightly reduced uniform elongation, compared with its coarse grained counterparts. Microstructural observations reveal that multiple deformation mechanisms, associated with the formation of dense dislocation patterns, deformation twins and martensitic phase, are activated upon straining and contribute to the delocalized plastic deformation and the superior mechanical performance of the GDS 304 stainless steel.

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“…In recent years, structural materials with heterogenous microstructures have been proposed to achieve excellent mechanical properties and good fatigue resistance [7][8][9][10][11][12][13][14][15]. Mechanical properties and deformation mechanisms of some typical heterogenous microstructures, such as gradient nanograined (GNG) structure [9][10][11], lamellar structure [12][13][14], hierarchical and laminated grains and twins structure [15], and harmonic structure [16,17], have been investigated. As indicated in Figure 1a, the conventional bimodal structure has an irregular coarse grain (CG) and ultrafine grain (UFG) distribution.…”

Section: Introductionmentioning

confidence: 99%

Ratcheting-Fatigue Behavior of Harmonic-Structure-Designed SUS316L Stainless Steel

Yang

Zhang

et al. 2021

Metals

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Stainless steels with harmonic-structure design have a great balance of high strength and high ductility. Therefore, it is imperative to investigate their fatigue properties for engineering applications. In the present work, the harmonic-structured SUS316L stainless steels were fabricated by mechanical milling (MM) and subsequent hot isostatic pressing (HIP) process. A series of ratcheting-fatigue tests were performed on the harmonic-structured SUS316L steels under stress-control mode at room temperature. Effects of grain structure and stress-loading conditions on ratcheting behavior and fatigue life were investigated. Results showed that grain size and applied mean stress had a significant influence on ratcheting-strain accumulation and fatigue life. Owing to the ultrafine grained structure, tensile strength of the harmonic-structured SUS316L steels could be enhanced, which restrained the ratcheting-strain accumulation, resulting in a prolonged fatigue life. A higher mean stress caused a faster ratcheting-strain accumulation, which led to the deterioration of fatigue life. Moreover, a modified model based on Smith–Watson–Topper (SWT) criterion predicted the ratcheting-fatigue life of the harmonic-structured SUS316L steels well. Most of the fatigue-life points were located in the 5 times error band.

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Cyclic strain amplitude-dependent fatigue mechanism of gradient nanograined Cu

Cited by 21 publications

References 40 publications

Fatigue and fracture of nanostructured metals and alloys

Fatigue and fracture of nanostructured metals and alloys

Superior Strength and Ductility of 304 Austenitic Stainless Steel with Gradient Dislocations

Ratcheting-Fatigue Behavior of Harmonic-Structure-Designed SUS316L Stainless Steel

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