Interface structures in Al-Nb2O5 nanocomposites processed by high-pressure torsion at room temperature

Silva, Clênio; Montoro, Luciano A.; Martins, Débora A.A.; Machado, Priscila Alves da Silva; Pereira, Pedro Henrique Rodrigues; Gonzalez, Berenice Mendonça; Langdon, Terence G.; Figueiredo, Roberto B.; Isaac, Augusta

doi:10.1016/j.matchar.2020.110222

Cited by 11 publications

(3 citation statements)

References 48 publications

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“…Severe plastic deformation, the method allowing reaching high strains even in brittle materials without fracture [ 14,15 ] and associated with the maximum permissible concentration of defects, [ 16 ] is also known for its ability to promote the solid state reactions. A particular case of severe deformation, high‐pressure torsion (HPT), has recently been discovered to be an effective way for the synthesis of metal matrix composites that can be performed via solid state welding of powders [ 17–19 ] or a lamellar disc set [ 13,20–23 ] of dissimilar metals. The greatest difference between cases of powder and discs consists in the free surface fraction.…”

Section: Introductionmentioning

confidence: 99%

Structure and Mechanical Behavior of Al–Nb Hybrids Obtained by High‐Pressure‐Torsion‐Induced Diffusion Bonding and Subsequent Annealing

Korznikova

Nazarov

et al. 2020

Adv Eng Mater

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The main approach of mechanical consolidation of dissimilar metals consists in solid state joining of thin discs or powders by means of pressure‐assisted shear deformation. Prior to this research, most strongly dissimilar systems, such as Al–W and Al–Ti, were only bonded by means of mechanical alloying and subsequent powder compaction. Herein, pioneering experimental research on the one‐step synthesis of an Al–Nb composite by means of diffusion bonding through high‐pressure torsion that allows figuring out several unusual results is presented. The maximal microhardness value is revealed to locate in the middle radius area, decreasing at the sample edge. Formation of a small amount of Al3Nb intermetallic phase is detected at room temperature deformation, while its equilibrium formation normally occurs above 600 °C. Post‐deformational annealing at 400 °C results in the overall decrease of the microhardness value along with its growth on the sample edge. Annealing at 600 °C does not lead to any degradation of the mechanical characteristics by comparison to those after annealing at 400 °C. The obtained results are discussed and explained in frames of contribution of different factors to the strengthening and softening dynamics of the composite material.

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Section: Introductionmentioning

confidence: 99%

Structure and Mechanical Behavior of Al–Nb Hybrids Obtained by High‐Pressure‐Torsion‐Induced Diffusion Bonding and Subsequent Annealing

Korznikova

Nazarov

et al. 2020

Adv Eng Mater

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“…Также немаловажную роль в определении эффективности повышения прочностных свойств играет вариация компонент составов покрытий или возможность получения покрытий путем варьирования слоев различных компонент, в результате которого получаются многослойные покрытия по типу «сэндвичей». Подобные покрытия обладают повышенной устойчивостью к механическим воздействиям, которое обусловлено граничными эффектами, возникающими при вариации слоев [12,13]. В ряде работ использование подобных структур (многослойных покрытий) позволило получить высокопрочные радиационностойкие покрытия, способные увеличить устойчивость сталей к газовому распуханию [14,15] Определение твердости было осуществлено с применением метода индентирования (в качестве индентера использовалась пирамида Виккерса).…”

Section: Introductionunclassified

СИНТЕЗ И ХАРАКТЕРИЗАЦИЯ ТОНКОПЛЕНОЧНЫХ ПОКРЫТИЙ НА ОСНОВЕ Nb2O5-MoN-AlN ПОЛУЧЕННЫХ МЕТОДОМ МАГНЕТРОННОГО НАПЫЛЕНИЯ

Д. Б. Боргеков,

А. Л. Козловский,

Д. И. Шлимас

et al. 2023

BTOUEn

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В работе представлены результаты оценки прочностных свойств многослойных тонкопленочных покрытий на основе соединений Nb2O5-MoN-AlN, полученных методом магнетронного напыления на поверхности стали марки 316 L. Выбор компонент для покрытий обусловлен возможностью повышения устойчивости к внешним воздействиям за счет высоких показателей прочностных характеристик данных покрытий, а также их структурных особенностей. С применением метода рентгенофазового анализа было установлено, что вариация количества слоев и компонент приводит к формированию аморфных покрытий. В качестве методов для определения прочностных характеристик были применены методы индентирования и определения коэффициента сухого трения. В случае нанесения двухкомпонентных многослойных покрытий, установлено, что твердость увеличивается на 10–20 %, а в случае трехкомпонентных покрытий увеличение твердости составило более чем 50 %. При испытаниях на износостойкость полученных покрытий было установлено, что нанесение на сталь марки 316 L двух-трехкомпонентных покрытий приводит к увеличению устойчивости к износу стали более чем в 7–10 раз, при этом профиль износа значительно меньше за счет высокой устойчивости покрытий к износу. Ключевые слова: магнетронное напыление, многослойные тонкопленочные покрытия, нитрид алюминия, твердость, упрочнение.

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“…Nb 2 O 5 has been used as reinforcement in bulk aluminium composites, where small additions of Nb 2 O 5 drastically increased the hardness of pure aluminium due to intense grain refinement [18]. As reinforcement for electrodeposited coatings, Nb 2 O 5 nanoparticles have been used for Ni electrodeposited coatings [19] and for Zn electrodeposited coatings [1].…”

Section: Introductionmentioning

confidence: 99%

Effects of niobium pentoxide nanoparticles on the tribological properties of electrodeposited ZnNi coatings

Moreira¹,

Oliveira²,

Carreño³

et al. 2022

Surf. Topogr.: Metrol. Prop.

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Electrodeposited ZnNi coatings are widely used to improve the corrosion resistance of steel substrates, but their tribological properties are also relevant for loaded contacts under relative motion. This work investigates the hypothesis of improving tribological properties of electrodeposited ZnNi coatings via dispersion of niobium pentoxide nanoparticles (1g/L) in the electrolytic bath. The niobium pentoxide nanoparticles were produced via hydrothermal synthesis assisted by microwave. The surface morphology and chemical composition of the coatings were analysed by scanning electron microscopy coupled with X-ray dispersive energy, X-ray diffraction and X-ray photoelectron spectroscopy. The tribological performance of the coatings was assessed using dry reciprocating ball-on-flat tests at normal loads between 3 and 6 N. The use of niobium pentoxide nanoparticles resulted in significantly denser coatings, with some Nb incorporated in the coated surfaces. Under the lowest normal load, all coated specimens showed relatively low friction (~0.2) and negligible damag. As the normal load increased, the coating produced using niobium pentoxide nanoparticles showed stronger adherence, while conventional ZnNi coating showed increased friction and spalling for the highest load. It is believed that the Nb2O5 nanoparticles increased the number of sites for heterogeneous nucleation, refining the microstructure, so that tougher and more adherent coatings were produced.

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Interface structures in Al-Nb2O5 nanocomposites processed by high-pressure torsion at room temperature

Cited by 11 publications

References 48 publications

Structure and Mechanical Behavior of Al–Nb Hybrids Obtained by High‐Pressure‐Torsion‐Induced Diffusion Bonding and Subsequent Annealing

Structure and Mechanical Behavior of Al–Nb Hybrids Obtained by High‐Pressure‐Torsion‐Induced Diffusion Bonding and Subsequent Annealing

СИНТЕЗ И ХАРАКТЕРИЗАЦИЯ ТОНКОПЛЕНОЧНЫХ ПОКРЫТИЙ НА ОСНОВЕ Nb2O5-MoN-AlN ПОЛУЧЕННЫХ МЕТОДОМ МАГНЕТРОННОГО НАПЫЛЕНИЯ

Effects of niobium pentoxide nanoparticles on the tribological properties of electrodeposited ZnNi coatings

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