Mechanically Synthesized Composite Powder Based on AMg2 Alloy with Graphite Additives: Particle Size Distribution and Structural-Phase Composition

Aborkin, A. V.; Алымов, М. И.; Kireev, A. V.; El'kin, A.I.; Sobol’kov, A. V.

doi:10.1134/s1995078017040024

Cited by 12 publications

(4 citation statements)

References 15 publications

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“…This can be attributed to the low content of C 60 in the powder mixture and may also be explained by the X-ray radiation micro-absorption during the X-ray phase analysis of composites reinforced with well-dispersed carbon nanostructures [29]. This is a typical observation for aluminum alloys reinforced with carbon structures, particularly at higher concentrations of reinforcing additives [30,31]. XRD data for the multi-reinforced powders obtained at the second stage show a qualitatively similar character.…”

Section: Resultsmentioning

confidence: 80%

Enhancing the Microhardness of Coatings Produced by Cold Gas Dynamic Spraying through Multi-Reinforcement with Aluminum Powders Containing Fullerenes and Aluminum Nitride

Aborkin,

Babin,

Belyaev

et al. 2023

JMMP

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Coatings with high hardness were successfully obtained using low-pressure cold spray (LPCS) technology from nanocrystalline powders based on the aluminum alloy AlMg6, which were multi-reinforced with 0.3 wt.% fullerenes and 10–50 wt.% AlN. The powders were synthesized through a two-stage high-energy ball milling process, resulting in a complex mechanical mixture consisting of agglomerates and micro-sized ceramic particles of AlN. The agglomerates comprise particles of the nanocomposite material AlMg6/C60 with embedded and surface-located, micro-sized ceramic particles of AlN. Scanning electron microscopy and EDS analyses demonstrated a uniform distribution of reinforcing particles throughout the coating volume. An X-ray diffraction (XRD) analysis of the coatings revealed a change in the predominant orientation of matrix alloy grains to a more chaotic state during deformation over the course of cold gas dynamic spraying. A quantitative determination of AlN content in the coating was achieved through the processing of XRD data using the reference intensity ratio (RIR) method. It was found that the proportion of transferred ceramic particles from the multi-reinforced powder to the coating did not exceed ~65%. Experimental evidence indicated that LPCS processing of mono-reinforced nanocrystalline powder composite AlMg6/C60 practically did not lead to the formation of a coating on the substrate and was limited to a monolayer with a thickness of ~10 µm. The microhardness of the monolayer coating obtained from the deposition of AlMg6/C60 powder was 181 ± 12 HV. Additionally, the introduction of 10 to 50 wt.% AlN into the powder mixture contributed to the enhancement of growth efficiency and an increase in coating microhardness by ~1.4–1.7 times. The obtained results demonstrate that the utilization of agglomerated multi-reinforced powders for cold gas dynamic spraying can be an effective strategy for producing coatings and bulk materials based on aluminum and its alloys with high microhardness.

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Section: Resultsmentioning

confidence: 80%

Enhancing the Microhardness of Coatings Produced by Cold Gas Dynamic Spraying through Multi-Reinforcement with Aluminum Powders Containing Fullerenes and Aluminum Nitride

Aborkin,

Babin,

Belyaev

et al. 2023

JMMP

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“…Secondly, by the rise of the value of specific surface of mechanically synthetically produced which changed to be twice bigger from 0.18 to 0.4 m 2 /g [8]. On one hand this helps increasing gas saturation of powder, on the other hand -increases friction loses between powder particles.…”

Section: Resultsmentioning

confidence: 99%

FRICTION AND WEAR OF BULK NANOCOMPOSITE MATERIALS AlMg2/GRAPHITE

Aborkin

El'kin

Sobol’kov

2017

Proccedings of International Scientific Conference "BALTTRIB 2017"

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Consolidation of nanocomposite AlMg2/graphite powders, produced by mechanical synthesis in a planetary ball mill, was carried out. Using the methods of Raman spectroscopy, and X-ray diffraction analysis, the structural-phase composition of the obtained bulk materials was studied. It was found that the samples have nanocomposite structure consisting of nanocrystalline aluminum and nanosized graphite particles. An increase in the consolidation temperature up to 450 °C leads to the formation of a dispersed phase of aluminum carbide. The effect of graphite percentage and consolidation conditions on the microhardness was estimated. Mechanisms of bulk material hardening are determined. Tribological tests of the obtained nanocomposite materials under conditions of contact interaction with 4Kh5MFS steel at a load of 1-10 N were carried out. Data on the change in the friction coefficient and magnitude of mass wear depending on the consolidation conditions and the graphite content were obtained.

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“…1а, вставка) в поле зрения ПЭМ, т. е. по крайней мере, на длине 100 -500 нм. Механическая обработка исходной шихты была проведена в планетарной мельнице FRITSCH PULVERISETTE 6 с применением поверхностно активных веществ (стеариновая кислота 1 вес.%) [15]. Обработку проводили при частоте вращения водила 600 об / мин в течение 6 часов.…”

Section: методыunclassified

Influence of the temperature of sintering under pressure on the structure and mechanical properties of a composite material AMg2 / γ-Al2O3 nanofibres

Aborkin¹,

Babin²,

Mochanov³

et al. 2019

LOM

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A nanocrystalline composite powder based on an AlMg2 alloy reinforced with 1 wt.% γ-Al 2 O 3 nanofibers was obtained in a planetary mill by mechanical synthesis. It was consolidated by sintering under pressure at a temperature of 300-450°C and a pressure of 600 MPa. The effect of the temperature of sintering under pressure on the structural-phase composition, density, hardness, and conventional yield stress of bulk composites was studied. For this, X-ray phase analysis, transmission electron microscopy, hydrostatic weighing, and mechanical testing were used. It has been found that an increase in the sintering temperature in this range leads to an increase in the relative density of compacts from 0.87 to 0.98. Based on the results of X-ray diffractometry, the sizes of coherent scattering regions corresponding to bulk composites consolidated at different temperatures are determined. It is shown that an increase in the consolidation temperature from 300 to 400°C leads to a linear increase in the size of coherent scattering regions from 109 to 495 nm, a further increase in temperature to 450°C results in a more intensive growth up to 4.2 μm. In this case, the hardness of the composite material decreases from 206 ±13 to 149 ± 3 HV 10 , which is due to the occurrence of the reduction processes and the transition of the structure from nanoscale to the micron scale. The maximum conventional yield stress for compression, 791± 58 MPa, corresponds to samples consolidated at 350°C, which is due to the overall effect of dispersion hardening by γ-Al 2 O 3 nanofibres and nanostructuring of the matrix material. An increase in temperature to 450°C neutralizes the effect of nanostructuring and leads to a reduction in the conventional yield stress for compression to 632 ± 30 MPa.

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Mechanically Synthesized Composite Powder Based on AMg2 Alloy with Graphite Additives: Particle Size Distribution and Structural-Phase Composition

Cited by 12 publications

References 15 publications

Enhancing the Microhardness of Coatings Produced by Cold Gas Dynamic Spraying through Multi-Reinforcement with Aluminum Powders Containing Fullerenes and Aluminum Nitride

Enhancing the Microhardness of Coatings Produced by Cold Gas Dynamic Spraying through Multi-Reinforcement with Aluminum Powders Containing Fullerenes and Aluminum Nitride

FRICTION AND WEAR OF BULK NANOCOMPOSITE MATERIALS AlMg2/GRAPHITE

Influence of the temperature of sintering under pressure on the structure and mechanical properties of a composite material AMg2 / γ-Al2O3 nanofibres

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