Improved fatigue resistance of gradient nanograined Cu

Long, Jianzhou; Pan, Qingsong; Tao, Nengguo; Dao, Ming; Suresh, S.; Lü, Lei

doi:10.1016/j.actamat.2018.12.018

Cited by 101 publications

(38 citation statements)

References 50 publications

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“…Here, our focus is not on topology optimization 122 , but on mesoscale optimization of the spatial distribution of microstructure features 123 . In cases where processing is feasible, grading of structure or composition can enhance properties [124][125][126][127] , enabling lightweighting. Materials designers have explored gradients of grain size 124,[127][128][129] , twin density 130,131 , component or phase fraction 132 .…”

Section: Energy Efficiency By Lightweighting and Harsh Operating Condmentioning

confidence: 99%

“…In cases where processing is feasible, grading of structure or composition can enhance properties [124][125][126][127] , enabling lightweighting. Materials designers have explored gradients of grain size 124,[127][128][129] , twin density 130,131 , component or phase fraction 132 . These investigations demonstrated that the underlying physical micro-mechanisms of deformation can be influenced by such grading, leading to improvements in plasticity 133,134 , strengthening 135 , and damage resistance 124,127,130,131,136 .…”

Section: Energy Efficiency By Lightweighting and Harsh Operating Condmentioning

confidence: 99%

“…Materials designers have explored gradients of grain size 124,[127][128][129] , twin density 130,131 , component or phase fraction 132 . These investigations demonstrated that the underlying physical micro-mechanisms of deformation can be influenced by such grading, leading to improvements in plasticity 133,134 , strengthening 135 , and damage resistance 124,127,130,131,136 . However, processes that realize gradients are difficult to scale up (for example, accumulative roll bonding 137,138 , thin film deposition 139,140 ).…”

Section: Energy Efficiency By Lightweighting and Harsh Operating Condmentioning

confidence: 99%

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Strategies for improving the sustainability of structural metals

Raabe

Taşan

Olivetti

2019

Nature

411

143

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Metagoods 16% Vehicles 13% Industrial equipment 16% Construction 55% Re ne Smelter Mine Fabrication Manufacture Use New Scrap Old Scrap Land ll Carbon scrap/nickel to other scrap markets Stock End-of-life products c Transportation 19% Electronics 5% Chemicals 1% Industrial machinery 30% Household appliances and metal goods 28% Building and infrastructure17% Mine Rutile Mill product Ti ingot Manufacturing scrap Mill scrap End-of-life products Use Ferrotitanium Ti sponge TiO 2 feed TiCl 4

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Section: Energy Efficiency By Lightweighting and Harsh Operating Condmentioning

confidence: 99%

Section: Energy Efficiency By Lightweighting and Harsh Operating Condmentioning

confidence: 99%

Section: Energy Efficiency By Lightweighting and Harsh Operating Condmentioning

confidence: 99%

See 1 more Smart Citation

Strategies for improving the sustainability of structural metals

Raabe

Taşan

Olivetti

2019

Nature

411

143

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“…Recently, gradient nanograined (GNG) materials with the spatially graded distributed grain sizes from nanometer in the surface to micron scale in the core exhibit a synergetic enhancement of mechanical properties, such as high strength, considerable ductility, excellent wear resistance, and improved resistance to fatigue cracking . For instance, by introducing a 65 μm thick GNG surface layer (accounting for a volume fraction of about 4.3%) on a CG Cu rod with a diameter of 6 mm, the measured fatigue limit of GNG/CG Cu at 10 7 cycles is 88 MPa, much higher than that of CG Cu (56 MPa) .…”

Section: Introductionmentioning

confidence: 99%

“…Microstructural observations revealed that abnormal grain growth is initiated from the subsurface layer, which obviously retards the crack initiation and thus results in the enhanced stress‐controlled fatigue properties of GNG/CG metals . More importantly, the strain‐controlled fatigue life of GNG/CG Cu even doubles that of the CG counterpart . Such superior fatigue resistance under strain control originates from homogeneous grain coarsening of the initially graded microstructure and suppressed surface roughening of cyclically deformed GNG/CG Cu …”

Section: Introductionmentioning

confidence: 99%

Effect of Volume Fraction of Gradient Nanograined Layer on Low‐Cycle Fatigue Behavior of Cu

2019

Self Cite

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Low‐cycle fatigue properties and cyclic behaviors of two pure Cu samples skinned with different volume fractions of gradient nanograined (GNG) layer are investigated under total strain‐amplitude‐controlled fatigue tests. Increasing the volume fraction of high‐strength GNG layer can greatly elevate the cyclic stress amplitude of GNG/coarse grain (CG) Cu, compared with that of CG Cu fatigued at the same strain amplitude. Distinctly, it does not clearly influence the low‐cycle fatigue life of GNG/CG samples with different GNG volume fractions, i.e., both exhibit comparable fatigue lives, even longer than their CG counterpart. Such enhanced low‐cycle fatigue life is mainly due to the progressive homogenization of the gradient surface nanostructure, which effectively suppresses the surface roughening and fatigue cracking of the GNG/CG samples during cyclic straining.

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A Study on the Surface Integrity of 50CrMnMoVNb Spring Steels with Different Matrix Strengths Processed by Shot Peening

Ren

Wang

et al. 2021

Adv Eng Mater

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The surface integrity of structural materials after surface mechanical strengthening has a significant effect on service performance. Herein, the 50CrMnMoVNb spring steels with different microstructures and strengths are surface strengthened by shot peening (SP) with the same parameter, and the effect of matrix strength on surface integrity, including the roughness, residual stress, and gradient structure, is systematically studied. The experimental results show that both the line roughness and surface roughness decrease with the increase in matrix strength; the microhardness enhancement at the topmost surface layer and thickness of gradient layer decrease with the increase in matrix strength, whereas the surface residual stress and the maximum compressive residual stress display an increasing trend with the increase in matrix strength, and both the depth at the maximum compressive residual stress and the thickness of compressive residual stress zone are stable with a value of ≈75 and ≈300 μm, respectively. Inspired by these results and discussions, the surface integrity of the shot peened (SPed) metallic materials would be improved greatly by composition adjustment and microstructure optimization to regulate the matrix strength, as well as the SP process optimization.

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Improved fatigue resistance of gradient nanograined Cu

Cited by 101 publications

References 50 publications

Strategies for improving the sustainability of structural metals

Strategies for improving the sustainability of structural metals

Effect of Volume Fraction of Gradient Nanograined Layer on Low‐Cycle Fatigue Behavior of Cu

A Study on the Surface Integrity of 50CrMnMoVNb Spring Steels with Different Matrix Strengths Processed by Shot Peening

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