Multiscale Phenomena in Fatigue of Ultra-Fine Grain Materials &amp;mdash; an Overview

Vinogradov, Alexei; Hashimoto, Satoshi

doi:10.2320/matertrans.42.74

Cited by 187 publications

(91 citation statements)

References 30 publications

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“…Cyclic softening apparently occurs at all plastic-strain amplitudes as previously reported in the literature. [9][10][11][12]19) To discuss the strain-amplitude dependence of the amount of cyclic softening, a cyclic softening ratio was defined as 1 À ð "3 = Max Þ. Here, "3 is the stress amplitude at the late stage of " cum ¼ 3 and Max is the maximum stress amplitude.…”

Section: Cyclic Stress-strain Responsementioning

confidence: 99%

“…These structural features of the SBs characterized by the present study are consistent with those reported in the literature. 9,11,14,16,18) Changes in grain size and grain morphology of the fatigued specimens were observed using the EBSD method. Grain maps obtained from an as-ECAPed material and a specimen Fig.…”

Section: Cyclic Stress-strain Responsementioning

confidence: 99%

“…7,8) In considering practical applications, the cyclic deformation and fatigue properties of UFG materials have been studied extensively. In particular, the following characteristic features in cyclic deformation of UFG Cu processed by ECAP have been sporadically reported: (1) cyclic softening is frequently detected as a stress-strain response, [9][10][11][12][13] (2) macroscopic shear bands (SBs) are formed inhomogeneously, 9,10,13-18) (3) coarse grains are locally developed. 9,12,14,15,[19][20][21] For example, Wu et al 14,15) observed no grain coarsening, while they found apparent SBs by scanning electron microscopy (SEM) observation.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Deformation Behavior of Ultra-Fine Grained Copper Produced by Equal Channel Angular Pressing

et al. 2009

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Cyclic deformation behavior of ultra-fine grained (UFG) Cu of 99.99% purity processed by equal-channel angular pressing was investigated. In tension-compression fatigue tests under strain control, UFG Cu showed cyclic softening. Shear bands were formed along the direction inclined by about 45 from the loading axis. Observations using an electron backscattering diffraction technique and transmission electron microscopy revealed that local grain growth took place in the shear bands and overall grains elongated along the shear direction. Cyclic softening can be understood as a result of dynamic grain coarsening occurred intensively in the strain localized shear bands.

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Section: Cyclic Stress-strain Responsementioning

confidence: 99%

Section: Cyclic Stress-strain Responsementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cyclic Deformation Behavior of Ultra-Fine Grained Copper Produced by Equal Channel Angular Pressing

et al. 2009

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“…A number of experimental investigations about nc materials have been carried out (e.g. their production by equal channel angular pressing [1][2][3][4][5][6][7][8][9][10]). However, investigations into the fatigue properties of electrodeposited nc metal are limited.…”

mentioning

confidence: 99%

Shear bands at the fatigue crack tip of nanocrystalline nickel

Xie

Hong

2007

Scripta Materialia

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Fatigue crack growth rates in electrodeposited nanocrystalline Ni and its coarse counterpart were experimentally investigated in this paper. The shear bands, called the epsilon plastic zone, were observed on the surface of nanocrystalline Ni samples. The length of the shear bands is close to the estimated size of the plastic zone at the crack tip. Atomic force microscopy measurements indicate that the shear strain in the shear bands and the width of shear bands increase with related crack length.

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“…Regarding the fatigue of UFG materials, most studies have concentrated on cyclic deformation, fatigue life, surface damage formation and underlying microstructural mechanisms [1][2][3][4][5][6]. Since the fatigue life of machine components and structures are mainly controlled by the growth life of a fatigue crack, the crack growth behavior should be clarified for the design of safe machine components and structures.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of crack growth rate and growth model of ultrafine grained copper

Goto

Han

Euh

et al. 2011

Computational Methods and Experimental Measurements XV

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High-cycle fatigue tests were carried out on smooth specimens of ultrafine grained (UFG) copper produced by equal channel angular pressing for 12 passes. The growth behavior of a small surface-crack was monitored. A major crack, which led to the final fracture of the specimen, initiated from shear bands (SBs) at an early stage of stressing. Different tendencies of growth behavior occurred depending on the ranges of crack length. To understand the changes in growth rate and fracture surface morphologies, a quantitative model describing a crack growth mechanism were developed considering the reversible plastic zone size at a crack tip. In addition, the crack growth rate of UFG copper was evaluated by applying the small-crack growth raw.

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Multiscale Phenomena in Fatigue of Ultra-Fine Grain Materials — an Overview

Cited by 187 publications

References 30 publications

Cyclic Deformation Behavior of Ultra-Fine Grained Copper Produced by Equal Channel Angular Pressing

Cyclic Deformation Behavior of Ultra-Fine Grained Copper Produced by Equal Channel Angular Pressing

Shear bands at the fatigue crack tip of nanocrystalline nickel

Evaluation of crack growth rate and growth model of ultrafine grained copper

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