Characterization of uniaxial fatigue behavior of precipitate strengthened Cu-Ni-Si alloy (SICLANIC(TM))

Saadouki, Bouchra; Elghorba, Mohamed; Pelca, Ph.; Sapanathan, Thaneshan; Rachik, Mohamed

doi:10.3221/igf-esis.43.10

Cited by 4 publications

(3 citation statements)

References 15 publications

(20 reference statements)

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“…Over the period of the field, the ions can be considered to be at rest. The wall layer of the plasma adjacent to the workpiece has a width of the order of the elec tron spatial oscillations amplitude d ≈ eE 0 /m e ω 2 The speed of electron thermal motion ν e = 3k B T e /2 at electron temperature T e = 2 • 10 4 K reaches the value ν e ≈ 0.94 • 10 6 m s −1 . The electron thermal motion energy in quasineutral plasma ε = 3k B T e /m e ≈ 2.6 eV.…”

Section: Estimates Of the Combined Discharge Basic Physical Parametersmentioning

confidence: 99%

“…One of the ways to increase the serviceability of products in terms of wear resistance is the creation of technologies and equipment for product surface layer hardening [1,2], in par ticular, plasma ones [3]. The latter include the equipment (unit) developed by the authors and technology that allow the surface layer formation of nanocomposite dissipative chemi cally stable coatings [4,5] consisting of:…”

Section: Introductionmentioning

confidence: 99%

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The effect of a combined low-pressure gas discharge on metal surfaces

Brzhozovskii¹,

Бровкова²,

Gestrin³

et al. 2018

J. Phys. D: Appl. Phys.

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The properties and effects of a combined gas discharge, obtained by superimposing ultrahigh frequency electromagnetic and electrostatic fields on the surface of metal products, have been studied. Estimates for the main physical properties characterizing the discharge have been obtained. The paper shows that the properties of a combined discharge essentially depend on the sign of the constant electric potential of the workpiece. In the case of a positive potential, there is a substantial hardening of the metal surface layer. Blanket coating formation, which is a nanocomposite twophase structure, has been recorded.

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Section: Estimates Of the Combined Discharge Basic Physical Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of a combined low-pressure gas discharge on metal surfaces

Brzhozovskii¹,

Бровкова²,

Gestrin³

et al. 2018

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…Currently, a lot of attention is paid to the creation of equipment and technologies for hardening the surface layer of metal products used in extreme conditions in order to increase their durability [1][2][3]. One of the main areas of research in this regard is the research into the effect of high-frequency (ω ~ 2π • 10 6 -2π • 10 8 s −1 ) (HF) low-pressure gas discharge on the product surface, which was studied experimentally [4][5][6] and theoretically [7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Study of the properties of the asymmetric microwave low pressure gas discharge

Brzhozovskii

Бровкова

Gestrin

et al. 2019

J. Phys. D: Appl. Phys.

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The properties of an asymmetric microwave gas discharge that occurs in an argon-filled resonator chamber of a processing plant near the surface of a metal product during the formation on it of a composite structure are experimentally and theoretically investigated. It is shown that with a significant difference between the electrode dimensions, the smaller of which is the product, and the larger are the resonator chamber walls, there is an area of a high energy density of the microwave field near the surface of the product, in which electrons are accelerated to high energies up to hundreds of eV. Diffusing from this area, high-energy electrons are decelerated due to inelastic scattering on the gas molecules that fill the resonator chamber, ionizing them or promoting them to an excited state. We have obtained a differential equation and found its solution which describes the diffusion process accompanied by the loss of energy by high-energy electrons, within the framework of the continuous deceleration model. The estimates of the main physical parameters characterizing the microwave gas discharge plasma are found. The conditions that are most favorable for the energy transfer from the microwave field to the plasma electron subsystem and the product surface treatment are determined.

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Fatigue behavior of precipitation strengthened Cu–Ni–Si alloy modified by Cr and Zr addition

Atapek

Pantelakis

Polat

et al. 2020

IJSI

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Purpose The purpose of this paper is to investigate the fatigue behavior of precipitation-strengthened Cu‒2.55Ni‒0.55Si alloy, modified by the addition of 0.25 Cr and 0.25 Zr (wt%), using mechanical and fractographical studies to reveal the effect of microstructural features on the fracture. Design/methodology/approach For strengthening, cast and hot forged alloy was subjected to solution annealing at 900°C for 60 min, followed by quenching in water and then aging at 490°C for 180 min. Precipitation-hardened alloy was exposed to fatigue tests at R=−1 and different stress levels. All fracture surfaces were examined within the frame of fractographical analysis. Findings Fine Ni-rich silicides responsible for the precipitation strengthening were observed within the matrix and their interactions with the dislocations at lower stress level resulted in localized shearing and fine striations. Although, by the addition of Cr and Zr, the matrix consisted of hard Ni, Zr-rich and Cr-rich silicides, these precipitates adversely affected the fatigue behavior acting as nucleation sites for cracks. Originality/value These findings contribute to the present knowledge by revealing the effect of microstructural features on the mechanical behavior of precipitation-hardened Cu‒Ni‒Si alloy modified by Cr and Zr addition.

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Characterization of uniaxial fatigue behavior of precipitate strengthened Cu-Ni-Si alloy (SICLANIC(TM))

Cited by 4 publications

References 15 publications

The effect of a combined low-pressure gas discharge on metal surfaces

The effect of a combined low-pressure gas discharge on metal surfaces

Study of the properties of the asymmetric microwave low pressure gas discharge

Fatigue behavior of precipitation strengthened Cu–Ni–Si alloy modified by Cr and Zr addition

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