Mechanical Properties of Copper Processed by Severe Plastic Deformation

Kunz, Ludvík

doi:10.5772/32634

Cited by 6 publications

(4 citation statements)

References 56 publications

(56 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…12. This conclusion applies to various materials including NC Cu which has been investigated in particular by the Brno group, see [232]. The fatigue response of electro-deposited NC Ni and cryo-milled UFG Al-Mg alloy has been studied by Hanlon et al [241,242].…”

Section: Fatigue Life Of Some Nc and Ufg Metalsmentioning

confidence: 93%

“…In Cu, the slip bands, their shape and mean features resemble the slip bands formed in CG Cu. As stated by Kunz [232] ''The role of the coarsened structure in the crack initiation process and the specific mechanism of initiation are not sufficiently understood. Contrary to the CG Cu, where the specific dislocation structures associated with cyclic slip bands are described thoroughly, there are no similar and conclusive observations on UFG Cu''.…”

Section: Fatigue Life Modelling Of Single-phase Ufg Materialsmentioning

confidence: 98%

“…The cyclic deformation and fatigue properties of UFG metals and alloys have been reviewed in some detail by Mughrabi [229], Mughrabi and Höppel [230] and more recently by Höppel and Göken [231], Kunz [232], and Padilla and Boyce [233], see also [234][235][236]. From these reviews, it arises that the cyclic and fatigue behavior strongly depend on parameters of the SPD procedure, on the purity of the material and on the type of fatigue loading.…”

Section: Cyclic Behavior Of Nc and Ufg Metalsmentioning

confidence: 98%

See 2 more Smart Citations

Failure of metals III: Fracture and fatigue of nanostructured metallic materials

2016

View full text Add to dashboard Cite

a b s t r a c tPushing the internal or external dimensions of metallic alloys down to the nanometer scale gives rise to strong materials, though most often at the expense of a low ductility and a low resistance to cracking, with negative impact on the transfer to engineering applications. These characteristics are observed, with some exceptions, in bulk ultra-fine grained and nanocrystalline metals, nano-twinned metals, thin metallic coatings on substrates and freestanding thin metallic films and nanowires. This overview encompasses all these systems to reveal commonalities in the origins of the lack of ductility and fracture resistance, in factors governing fatigue resistance, and in ways to improve properties. After surveying the various processing methods and key deformation mechanisms, we systematically address the current state of the art in terms of plastic localization, damage, static and fatigue cracking, for three classes of systems: (1) bulk ultra-fine grained and nanocrystalline metals, (2) thin metallic films on substrates, and (3) 1D and 2D freestanding micro and nanoscale systems. In doing so, we aim to favour cross-fertilization between progress made in the fields of mechanics of thin films, nanomechanics, fundamental researches in bulk nanocrystalline metals and metallurgy to impart enhanced resistance to fracture and fatigue in high-strength nanostructured systems. This involves exploiting intrinsic mechanisms, e.g. to enhance hardening and rate-sensitivity so as to delay necking, or improve grain-boundary cohesion to resist intergranular cracks or voids. Extrinsic methods can also be utilized such as by hybridizing the metal with another material to delocalize the deformation -as practiced in stretchable electronics. Fatigue crack initiation is in principle improved by a fine structure, but at the expense of larger fatigue crack growth rates. Extrinsic toughening through hybridization allows arresting or bridging cracks. The content and discussions are based on experimental, theoretical and simulation results from the recent literature, and focus is laid on linking microstructure and physical mechanisms to the overall mechanical behavior.

show abstract

Section: Fatigue Life Of Some Nc and Ufg Metalsmentioning

confidence: 93%

Section: Fatigue Life Modelling Of Single-phase Ufg Materialsmentioning

confidence: 98%

Section: Cyclic Behavior Of Nc and Ufg Metalsmentioning

confidence: 98%

See 1 more Smart Citation

Failure of metals III: Fracture and fatigue of nanostructured metallic materials

2016

View full text Add to dashboard Cite

show abstract

“…Several studies have explored the grainsize e ects on cyclic deformation of Ultra-Fine Grain (UFG) materials produced by ECAP. Most of them have shown an enhanced fatigue life of the UFG copper than the coarse-grained counterpart when the cycling is stress-controlled [7][8][9], while grain re nement under plastic strain-controlled testing is not advantageous to both high [10,11] and low purity coppers [8] due to cyclic softening under strain-controlled fatigue. Also, it is shown that a decrease in the purity of copper can improve the fatigue strength at S-N curve [12].…”

Section: Introductionmentioning

confidence: 99%

Fatigue behavior of nano-grained pure copper processed by equal channel angular rolling

Habibi¹,

Ketabchi²,

Eskandarzadeh³

2017

Scientia Iranica

View full text Add to dashboard Cite

Abstract. The equal channel angular rolling process was successfully performed on commercial pure copper. After 4 passes of this process, grains with a diameter of about 70-500 nm were formed. The fatigue test results showed that the ultra-ne grained copper represents a longer lifetime under stress-controlled fatigue. To clarify the formation process of surface damage, morphological changes in the fractured surface were monitored by scanning electron microscopy.

show abstract