Pulsed electrodeposition and mechanical properties of Ni-W/SiC nano-composite coatings

Wasekar, Nitin P.; Latha, S.; Ramakrishna, M.; Rao, D. Srinivasa; Sundararajan, G.

doi:10.1016/j.matdes.2016.09.070

Cited by 172 publications

(54 citation statements)

References 42 publications

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“…The concentration of nc-TiO 2 in TNF-PC was higher (5.8 ± 0.8 wt%) than in the TNF-DC composite (4.4 ± 0.8 wt%), which demonstrated that PC conditions were also beneficial for the co-deposition of nc-TiO 2 . Many researchers noticed that, in off-time under PC electrodeposition, better particle adsorption on the working electrode surface occurs, which is related to a higher amount and better connection of incorporated particles in electrodeposited alloys than under DC conditions [23][24][25]. It may be postulated therefore that, in our experiments, cyclic depolarization of the working electrode enhanced the nc-TiO 2 deposition.…”

Section: Chemical Compositionmentioning

confidence: 56%

Microstructure and Properties of Electrodeposited nc-TiO2/Ni–Fe and Ni–Fe Coatings

et al. 2019

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In this study, nc-TiO 2 /Ni-Fe composite coatings, and Ni-Fe alloys as equivalents to their matrices, were obtained from citratesulphate baths in the electrodeposition process using direct current and pulse current conditions. The aim of the study was to examine the effects of TiO 2 nanoparticles and current conditions on the chemical composition, surface morphology, microstructure, microhardness and magnetic properties of the electrodeposited coatings. The results show that the concentration of Fe in Ni-Fe alloys is related to the current conditions and is higher in the case of pulse current electrodeposition, while such a relationship was not observed for composites. The reinforcement of composites with TiO 2 nanoparticles results in a more developed surface topography with many nodule-like structures. Composites and equivalent alloys deposited in pulse current are characterized by a finer grain size than those obtained in direct current. TiO 2 nanoparticles and their agglomerates, several tens of nanometres in size, are distributed randomly in the Ni-Fe matrix of composites deposited in both current conditions used. Incorporation of a high volume fraction of nc-TiO 2 , exceeding over a dozen percent, and decreasing the nanograin size in nc-TiO 2 /Ni-Fe composites electrodeposited under pulse current conditions, allow a higher hardness to be achieved than in their counterparts obtained using direct current. Magnetic measurements showed ferromagnetic ordering of pristine TiO 2 nanoparticles, however, the introduction of TiO 2 nanoparticles into the Ni-Fe matrix resulted in a decrease in coercivity and saturation magnetization.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Chemical Compositionmentioning

confidence: 56%

Microstructure and Properties of Electrodeposited nc-TiO2/Ni–Fe and Ni–Fe Coatings

et al. 2019

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“…9 that there was serious abrasion on surface of coating obtained under direct current electrodepositing: large pieces of grinding, step-like wear marks, wide and deep furrow on wear surface accompanied pits and phenomena of massive spalling; there was greatly improved abrasion on surface of coating obtained under positive current electrode positing: significantly reduced pits and less phenomena of peeling, more sparse grinding marks; there was better wear resistance on surface of coating obtained under reverse current electrode positing: no large grinding appeared, wear scar became narrow and shallow. The reasons for above results are as follows: firstly, the different refine degree and densification degree of matrix Ni crystal grain in composite coating led to difference of hardness and toughness of coating, thus it may influence the wear resistance performance of coating; secondly, the content of nano TiN particles in composite coating gradually increased and the defects of dislocation and twin crystal in composite coating also gradually increased with the change of acting mold of current (direct current, positive pulse current, reverse pulse current), these defects were conducive to improve the carrying capacity and anti-plastic deformation of coating; thirdly, co-depositing TiN particles may approximately form a transfer film within the matrix metal and its grain boundaries under condition of friction and wear, so it can effectively block movement of internal dislocation and sliding of grain boundary in composite coating; fourthly, nano TiN particles which evenly dispersed in coating could play the role of restructuring when coating surface was damaged, so that the coating could be strengthened, at the same time it also played a role of protection and lubrication for coating, thereby enhanced the wear resistance of coating [15][16].…”

Section: Methodsmentioning

confidence: 99%

The influence of acting mode of current on structure and mechanical properties of Ni-nanoTiN composite coatings

Wu¹,

He²,

Lv³

2017

Proceedings of the 2016 International Forum on Mechanical, Control and Automation (IFMCA 2016)

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Abstract. Ni-nanoTiN composite coatings were electrode posited on 45 steel substrate by using the ultrasonic-electrode position for nickel sulfamate bath. The effects of direct current, positive pulse current, reverse (positive and negative) pulse on surface morphology, binding force, micro hardness, friction and wear performance of Ni-nanoTiN composite coating. The results show that the micro hardness is 322.68 HV 0.1 , the critical load of binding force is 25N, bigger cracks, rough surface, coarse grains and bad wearing of coating when direct current deposition; the micro hardness is 371.74 HV 0.1 , the critical load of binding force is 40N, smaller cracks, smooth surface, relatively small grain, better friction and wear performance of coating when positive current deposition; the micro hardness is 494.18 HV 0.1 , the critical load of binding force is over 50N, non cracks, more smooth surface, tiny grains, best friction and wear performance of coating when positive and negative pulse deposition. Positive and negative pulse deposition may further refine grain, improve surface morphology, increase nanoTiN particles co-deposition and enhance mechanical properties of composite coating.

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“…Bimetallic laminated composites have attracted much attention because of their excellent properties [1][2][3][4][5][6]. Magnesium alloys with low density, light weight, and high specific strength and stiffness are widely used in aerospace, automotive, and electronic industries [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characterization and Mechanical Property of Mg/Al Laminated Composite Prepared by the Novel Approach: Corrugated + Flat Rolling (CFR)

Wang

Ren

et al. 2019

Metals

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In this paper, Mg/Al laminated composites were successfully prepared at 400 °C by corrugated + flat rolling (CFR) with reduction ratios of 35% and 25% and subsequent annealing treatments were conducted at 200–350 °C for 30 min. A two-dimensional model was established to analyze the strain distribution during the first corrugated rolling process. Simulation results indicated that severe plastic deformation was formed at trough positions, which included more numerous refined grains than in the peak positions. The interfacial microstructure and mechanical property of the flattened composites along the rolling direction (RD) and the transverse direction (TD) were investigated. The results revealed that longitudinal discontinuous and transverse continuous interfacial intermetallic compounds (IMCs) were observed of the flattened as-rolled sample. Spatial distribution was provided for the grain microstructure along the thickness and rolling direction for AZ31B magnesium alloys of the CFR as-rolled composite. Mechanical property results showed that the longitudinal ultimate tensile strength (UTS) and elongation (EL) of the as-rolled sample reached 255 MPa and 4.14%, respectively. The as-rolled UTS along TD reached 325 MPa, about 30% higher than that along the RD. After heat treatment, the anisotropy of mechanical properties remained. The microstructure evolution and mechanical properties were discussed in detail.

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Pulsed electrodeposition and mechanical properties of Ni-W/SiC nano-composite coatings

Cited by 172 publications

References 42 publications

Microstructure and Properties of Electrodeposited nc-TiO2/Ni–Fe and Ni–Fe Coatings

Microstructure and Properties of Electrodeposited nc-TiO2/Ni–Fe and Ni–Fe Coatings

The influence of acting mode of current on structure and mechanical properties of Ni-nanoTiN composite coatings

Microstructure Characterization and Mechanical Property of Mg/Al Laminated Composite Prepared by the Novel Approach: Corrugated + Flat Rolling (CFR)

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