An approach to cyclic plasticity and deformation-induced structure changes of electrodeposited nickel

Thiele, E.; Klemm, R. B.; Hollang, L.; Holste, C.; Schell, Norbert; Natter, Harald; Hempelmann, Rolf

doi:10.1016/j.msea.2004.09.022

Cited by 34 publications

(4 citation statements)

References 28 publications

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“…Hardness increases with decreasing grain size. It has been illustrated [26] that the internal stress of deposits which relates to hardness increases as the grain size decreases. As the Ni thickness increases the crystallite size of the film increases with smaller stress while the dislocation density decreases [27].…”

Section: Synthesis Of Nickel Coatingmentioning

confidence: 99%

Effect of current density on the microstructure and morphology of the electrodeposited nickel coatings

2021

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The aim of this research work was to study the effect of deposition current density on microstructure and surface morphology of electrodeposited nickel coatings. For this purpose, nickel deposits have been synthesized by direct current from watts bath without additive, to limit the incorporation of pollutants resulting from surface adsorption or electroactivity of these compounds. Nickel deposits have been investigated by Scanning electron microscopy and X-ray diffraction. Cyclic voltammetry was also used to gain information on the general behavior of the deposition. The optimum conditions of deposition were established and the influence of current density on the grain size, surface morphology, and crystal orientation was determined.

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Section: Synthesis Of Nickel Coatingmentioning

confidence: 99%

Effect of current density on the microstructure and morphology of the electrodeposited nickel coatings

2021

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“…Symbols correspond to experimental data for coarse and fine grain sizes (Morrison and Moosbrugger, 1997). from Buque et al, 2001;Morrison, 1994;Thiele et al, 2005.…”

Section: Gpamentioning

confidence: 99%

Mesoscale cyclic crystal plasticity with dislocation substructures

Castelluccio

McDowell

2017

International Journal of Plasticity

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Constitutive formulations have increasingly focused on physically-based approaches that are less phenomenological and incorporate information from multiple scales. Most dislocation-based plasticity approaches reflect many-body dislocation physics without considering the length scales introduced by the self-organization of dislocations into mesoscale structures. These structures promote internal stresses or back stresses that are heterogeneous and long-range in nature and play a critical intermediary role in distinguishing the stress at micro-and nano-scales under cyclic loading. We present a framework that explicitly incorporates length-scales and evolution laws associated with mesoscale dislocation substructures such as cells and persistent slip bands (PSBs) in metallic materials under cyclic loading. A physically-based formulation for the back stress based on the Eshelby inclusion formalism is introduced that explicitly depends on morphology of mesoscale dislocation structures. The approach employs material parameters that can be measured or computed at lower length scales to contrast the response of models and experiments for multiple single crystals orientation and polycrystals for a wide range of strains.

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“…Furthermore, other cyclic strain accommodation mechanisms, such as dislocation cells, are also inhibited due to the small grain size [5]. Thiele et al [19] verified that dislocation-grain boundary interactions were the main activities during cyclic deformation of NC nickel material with conventional grain size, but when the grain size became smaller and in the range of 100 nm to 750 nm, grain boundary activity became an important part of the micro-activities during cycling. With the above considerations it is expected that new cyclic strain accommodation mechanisms, that are different from those of conventional grain size metals, would be in operation for UF and NC grained metals.…”

Section: Introductionmentioning

confidence: 99%

The Cyclic Deformation Behavior of Severe Plastic Deformation (SPD) Metals and the Influential Factors

Kwan

Wang

2012

Metals

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Abstract:A deeper understanding of the mechanical behavior of ultra-fine (UF) and nanocrystalline (NC) grained metals is necessary with the growing interest in using UF and NC grained metals for structural applications. The cyclic deformation response and behavior of UF and NC grained metals is one aspect that has been gaining momentum as a major research topic for the past ten years. Severe Plastic Deformation (SPD) materials are often in the spotlight for cyclic deformation studies as they are usually in the form of bulk work pieces and have UF and NC grains. Some well known techniques in the category of SPD processing are High Pressure Torsion (HPT), Equal Channel Angular Pressing (ECAP), and Accumulative Roll-Bonding (ARB). In this report, the literature on the cyclic deformation response and behavior of SPDed metals will be reviewed. The cyclic response of such materials is found to range from cyclic hardening to cyclic softening depending on various factors. Specifically, for SPDed UF grained metals, their behavior has often been associated with the observation of grain coarsening during cycling. Consequently, the many factors that affect the cyclic deformation response of SPDed metals can be summarized into three major aspects: (1) the microstructure stability; (2) the limitation of the cyclic lifespan; and lastly (3) the imposed plastic strain amplitude.

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An approach to cyclic plasticity and deformation-induced structure changes of electrodeposited nickel

Cited by 34 publications

References 28 publications

Effect of current density on the microstructure and morphology of the electrodeposited nickel coatings

Effect of current density on the microstructure and morphology of the electrodeposited nickel coatings

Mesoscale cyclic crystal plasticity with dislocation substructures

The Cyclic Deformation Behavior of Severe Plastic Deformation (SPD) Metals and the Influential Factors

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