Analyzing the hardness and wear properties of SiC and hBN reinforced aluminum hybrid nanocomposites

Krishnan, Parthiban; Lakshmanan, Poovazhagan; Palani, Sarangapani; Arumugam, Arun; Kulothungan, S

doi:10.1016/j.matpr.2022.03.593

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…As the temperature goes up, local softening occurs and the tangential force may reduce[67,68]. The reduction of the COF induced by the increased normal force has also been observed by others in the literature[50,69,70]. Karbalaei Akbari[53] has reported the mentioned phenomenon while studying the tribology of Al356/TiO 2 and TiB 2 nanocomposites, attributing it to the formation of a tribo-oxide layer as a result of the increasing force.…”

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confidence: 58%

An Investigation on the Enhanced Wear Behavior of Ultrasonically Stirred Cast A356/SiO2np Nano-composites

et al. 2023

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Metal matrix nanocomposites (MMNCs) are becoming the materials of choice in a variety of engineering and medical applications owing to their exhibiting a superior combination of targeted properties. Amongst different MMNCs, aluminum-based composites are of special importance. In many applications, a relatively inferior wear property limits the use of this valued metal in practice. However, reinforcing aluminum and its alloys by ceramics, carbon allotropes, etc., may circumvent these limitations to a great extent. In the present study, aluminum alloy A356/SiO2 nanocomposite is fabricated by a vibration-assisted casting process, wherein varied amount of nanosilica, namely, 0.125, 0.25, and 0.375 wt.%, have been added to the melt. The use of power ultrasonic treatment had a great influence on the microstructure, hardness, and wear properties. Microstructural and XRD analyses were performed on the fabricated monolithic and composite samples. To evaluate wear behavior, a hardness test and pin-on-disk experiment were conducted on the samples under 60, 80, and 100 N forces at a constant speed of 1 m/s and the sliding distance was varied from 1000 to 2000 m. The abraded surfaces, wear debris, and EDS analysis were used to identify wear mechanisms. The samples having 0.125 wt.% exhibited the highest increase in hardness and the highest reduction in both friction coefficient and wear rate by 52%, 50%, and 68%, respectively. The main governing wear mechanism was abrasion, with limited evidence of delamination.

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confidence: 58%

An Investigation on the Enhanced Wear Behavior of Ultrasonically Stirred Cast A356/SiO2np Nano-composites

et al. 2023

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“…However, the addition of this nanoreinforcement beyond 3 wt.% gradually decreased the hardness of the nanocomposite due to the agglomeration of hBN in the Al matrix at higher loading levels. At lower loading levels of the nanoreinforcement, the uniform distribution of nanoreinforcement takes place, which reduces particle interface lengths, resulting in the increase in mechanical properties like strength and hardness of the nanocomposites [54,55].…”

Section: Resultsmentioning

confidence: 99%

Effect of ball milling on hexagonal boron nitride (hBN) and development of Al-hBN nanocomposites by powder metallurgy route

Ghosh

Shukla

Sahoo

et al. 2023

Materials Science-Poland

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This study reports on the exfoliation of bulk hexagonal boron nitride (hBN) by high-energy ball milling and the development of Al-hBN (alumninum-hexagonal boron nitride) nanocomposites by the powder metallurgy (PM) route via the incorporation of the exfoliated hBN in the Al matrix as a nanoreinforcement. The effect of ball milling on the morphology, crystallite size, lattice strain, and thermal stability of hBN powder have also been reported in this paper. Commercially available bulk hBN was ball milled for up to 30 hours in a high-energy planetary ball mill in order to exfoliate the hBN. Although no new phases were formed during milling, which was confirmed by the XRD (x-ray powder diffraction) spectra, ball milling resulted in the attachment of functional groups like hydroxyl (OH) and amino (NH2) groups on the surface of the hBN, which was confirmed by FTIR (Fourier Transform Infrared Spectroscopy) analysis. HRTEM (high resolution transmission electron microscopy) analysis confirmed the synthesis of hBN having few atomic layers of hBN stacked together after 20 hours of milling. After 20 hours of milling, the hBN particle size was reduced from ~1 μm to ~400 nm, while the crystallite size of the 20-hour-milled hBN powder was found to be ~18 nm. Milling resulted in a flake-like structure in the hBN. Although milling involved both exfoliation as well as reagglomeration of the hBN particles, a significant decrease in the diameter of the hBN particles and their thickness was observed after a long period of milling. The average thickness of the 20-hour-milled hBN flakes was found to be ~32.61 nm. HRTEM analysis showed that the hexagonal structure of the milled hBN powder was maintained. Al-based nanocomposites reinforced with 1%, 2%, 3%, and 5% by weight hBN were fabricated by PM route. The Al-hBN powder mixtures were cold-compacted and sintered at 550°C for 2 hours in argon (Ar) atmosphere. The maximum relative density of ~94.11% was observed in the case of Al-3 wt.% hBN nanocomposite. Al-3 wt.% hBN nanocomposite also showed a significant improvement in hardness and wear resistance compared to the pure Al sample that was developed in a similar fashion. The maximum compressive strength of ~999 MPa was observed in the case of Al-3 wt.% hBN nanocomposite and was approximately twice that of the pure Al sample developed in a similar fashion.

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“…While the aluminum and copperrich phases in the internal structures of the Zn-Al series alloys undertake the load-bearing task, the softer zinc-rich η phase facilitates slippage and reduces the friction coefficient [23]. In a similar study, SiC and h-BN nanoparticles within the Al6063 matrix significantly reduced the wear rate and friction coefficient of the hybrid composites, and the 5 % SiC-1.5 % h-BN doped hybrid composite showed the best wear resistance [24].…”

Section: Average Frictional Coefficient and Wear Ratementioning

confidence: 86%

The effect of boron nitride (h-BN) and silicon carbide (SiC) on the microstructure and wear behavior of ZA40/SiC/h-BN hybrid composites processed by hot pressing

YALÇIN¹,

Çanakçı²,

Çuvalcı³

et al. 2023

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Within the scope of this study, silicon carbide (SiC) and hexagonal boron nitride (h-BN) powders were added as reinforcement into zinc-aluminum (ZA40) matrix powders, and the powder metallurgy (PM) method, which is an advanced technique in material production, was used to fabricate ZA40/SiC/h-BN hybrid composites. In the milling process, the asreceived powders were mechanically milled at 400 rpm under a protective argon atmosphere for 2 h at room temperature. The hybrid composite powders were consolidated under 700 MPa pressure at 515 • C for 3 h by hot pressing. Weight losses, friction coefficients, and wear rates were calculated by traveling 100 and 200 m at 250 rpm in a ball-on-disc abrasion test setup under 5 and 10 N loads. According to the results, it was seen that SiC and increased h-BN reinforcement changed the mechanical and physical properties of the composites and made significant contributions to the wear resistance and load-carrying capacity. K e y w o r d s : ZA40, silicon carbide, boron nitride, wear, hot pressing

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Analyzing the hardness and wear properties of SiC and hBN reinforced aluminum hybrid nanocomposites

Cited by 6 publications

References 22 publications

An Investigation on the Enhanced Wear Behavior of Ultrasonically Stirred Cast A356/SiO2np Nano-composites

An Investigation on the Enhanced Wear Behavior of Ultrasonically Stirred Cast A356/SiO2np Nano-composites

Effect of ball milling on hexagonal boron nitride (hBN) and development of Al-hBN nanocomposites by powder metallurgy route

The effect of boron nitride (h-BN) and silicon carbide (SiC) on the microstructure and wear behavior of ZA40/SiC/h-BN hybrid composites processed by hot pressing

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