Effect of Bimodal-Sized Hybrid TiC–CNT Reinforcement on the Mechanical Properties and Coefficient of Thermal Expansion of Aluminium Matrix Composites

Nyanor, Peter; Elkady, Omayma A.; Yehia, Hossam M.; Hamada, Atef; Hassan, Mohsen A.

doi:10.1007/s12540-020-00802-w

Cited by 29 publications

(5 citation statements)

References 56 publications

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“…Increasing the strength of the fabricated HEAs samples may be due to the nano size of the precipitated copper. According to the Hall-Petch equation, there is an inversely proportional relationship between the material's strength and grain-size, where the reduction in grain size leads to an increase in material strength [64,65]. As shown, the AlCoCrFeNi HEAs strength has increased by increasing the percentage of the nano-copper particles that precipitated using the electroless coating process up to 15 wt% Cu then decreased.…”

Section: Compression Strengthmentioning

confidence: 99%

Effect of Copper Addition on the AlCoCrFeNi High Entropy Alloys Properties via the Electroless Plating and Powder Metallurgy Technique

et al. 2021

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To improve the AlCoCrFeNi high entropy alloys’ (HEAs’) toughness, it was coated with different amounts of Cu then fabricated by the powder metallurgy technique. Mechanical alloying of equiatomic AlCoCrFeNi HEAs for 25 h preceded the coating process. The established powder samples were sintered at different temperatures in a vacuum furnace. The HEAs samples sintered at 950˚C exhibit the highest relative density. The AlCoCrFeNi HEAs model sample was not successfully produced by the applied method due to the low melting point of aluminum. The Al element’s problem disappeared due to encapsulating it with a copper layer during the coating process. Because the atomic radius of the copper metal (0.1278 nm) is less than the atomic radius of the aluminum metal (0.1431 nm) and nearly equal to the rest of the other elements (Co, Cr, Fe, and Ni), the crystal size powder and fabricated samples decreased by increasing the content of the Cu wt%. On the other hand, the lattice strain increased. The microstructure revealed that the complete diffusion between the different elements to form high entropy alloy material was not achieved. A dramatic decrease in the produced samples’ hardness was observed where it decreased from 403 HV at 5 wt% Cu to 191 HV at 20 wt% Cu. On the contrary, the compressive strength increased from 400.034 MPa at 5 wt% Cu to 599.527 MPa at 15 wt% Cu with a 49.86% increment. This increment in the compressive strength may be due to precipitating the copper metal on the particles’ surface in the nano-size, reducing the dislocations’ motion, increasing the stiffness of produced materials. The formability and toughness of the fabricated materials improved by increasing the copper’s content. The thermal expansion has increased gradually by increasing the Cu wt%.

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Section: Compression Strengthmentioning

confidence: 99%

Effect of Copper Addition on the AlCoCrFeNi High Entropy Alloys Properties via the Electroless Plating and Powder Metallurgy Technique

et al. 2021

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“…Additionally, factors related to additives, such as the type of reinforcement, dispersion of reinforcements, coating mechanism, and bonding between the reinforcement and matrix, are also significant contributors. To elucidate the influence of h-BN inside Al-0.6wt.%CNTs on the wear rate of hot compacted samples, a comprehensive understanding of the crystal structure of CNTs and h-BN is essential [8,26,33,39,57,58].The tribological characteristics of CNT-reinforced composites can be impacted by structural characteristics, including: (i) the strong metallurgical bond formed through the Interconnected covalent bonds between carbon atoms with CNTs, leading to an increased Density of dislocations in the composite; (ii)The singular and extensive molecular structure of carbon nanotubes, characterized by the absence of grain boundaries compared to other metallics materials. Furthermore, the crystal lattice of h-BN nitride is characterized by hexagonal rings forming thin, parallel planes.…”

Section: Tribological Of the Al-cnts/h-bn Hybrid Nanocompositesmentioning

confidence: 99%

“…As mentioned above, CNTs are a suitable reinforcement for producing Al/CNTs-based hybrid composites. Accordingly, many researchers were interested in producing Al/CNTs-based composites using different reinforcement like Al2O3 [23], TiO2 [24], TiC [25,26], ZrB2 [22], and Gr [27]. Table 1 summarizes the previous works that apply the Al/CNTs as a matrix to produce HMMCs.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of microstructural, mechanical and tribological properties of hybrid Al- CNTs through electroless deposition of innovative h-BNs contents coated Ag and Ni for purpose of ball bearing

Barakat,

Samir,

Elkady

et al. 2024

Preprint

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Ball bearings face numerous challenges under harsh operating conditions of elevated pressure between the balls and other contacting parts of the bearing like drop in tribological properties. To address these challenges, a new attempt was successfully made for the first time in this paper through an experimental investigation by the impact of incorporating hexagonal boron nitride (h-BN) into Aluminum-Carbon nanotubes (Al-0.6 wt. % CNTs) nanocomposites by an innovative coated with silver (Ag) and nickel (Ni) using a novel electroless chemical deposition technique, to improve the wettability and scattering between matrix and reinforcement. Various h-BN ratios (2, 4, 6, 8 and 10 wt. %) are incorporated and consolidated through high-energy ball milling and hot compaction techniques. The produced samples were tested and analyzed physically, mechanically, tribologically, and microstructurally. X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses were used to explore the new morphologies and structures. The study delves into density, hardness, and wear resistance. The optimal h-BN content is determined to be 8 wt.%, enhancing wettability and dispersion within the Al-CNTs matrix. Thus, the properties of hardness, compressive strength, wear rate, and COF at 8 wt.% of h-BN content were enhanced by 105%, 60%, 74.5%, and 78.5%, respectively, compared to pure Al. This is due to the uniform scattering of h-BN nanoparticles across the entire surface, despite a significant decrease in relative density. In conclusion, the combination of high-energy ball milling, electroless deposition, and hot compaction techniques proves to be effective in producing Al-CNTs/h-BN nanocomposites coated with Ag and Ni nanoparticles.

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“…However, the CTE mismatch between the Al heat sinks (~23.6 × 10 −6 /K) and heat sources (4-8 × 10 −6 /K in GaAs, GaN, and Al 2 O 3 [4]) must be reduced to relieve the thermal stress at the interface during the thermal cycle [5]. To satisfy the requirements of heat sink applications, various types of reinforcements with high TC, such as B 4 C [6], C fibers [7], CNT [8], and SiC [9][10][11], have been utilized to develop novel Al matrix composites (AMCs) [12]. However, the formation of the carbide phase (Al 4 C) at the interface is the main concern in carbide (carbon)-reinforced AMCs and should be avoided to prevent the degradation of thermal and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of In Situ Aluminum Matrix Composites with Interconnected Aluminum Nitride Produced by Arc Plasma-Induced Accelerated Volume Nitridation

Jeong,

Kim,

Lee

2023

Metals

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We present a strategy for fabricating aluminum (Al) matrix composites (AMCs) reinforced with interconnected aluminum nitride (AlN) via arc plasma-induced accelerated volume nitridation. AMCs with 10 vol.% AlN are formed in situ by the reaction between liquid Al alloy and nitrogen gas within 1 min of arc melting, revealing very high formation rate of AlN (3.28 × 10−1 g/min·cm3). The rapid nitridation is attributed to the improved wettability and spontaneous infiltration of the melt, which results in the formation of AlN agglomerates and lamellas. In particular, Al-12Si/AlN composites exhibit over two times higher yield strength (195 MPa) than the Al/AlN composites (70 MPa) when compressed along the longitudinal direction to the lamellas. The coefficient of thermal expansion (CTE) is about 30% lower in the Al-12Si/AlN composites (17.0 × 10−6/K) than pure Al (23.6 × 10−6/K). This is attributed to the interconnected AlN architecture and Al–Si eutectic microstructure, which constrain the thermal expansion of the Al matrix. The present AMCs afford an attractive combination of specific thermal conductivity and CTE. These findings would facilitate the development of novel AMCs reinforced with interconnected AlN as cost-effective heat sink materials.

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Effect of Bimodal-Sized Hybrid TiC–CNT Reinforcement on the Mechanical Properties and Coefficient of Thermal Expansion of Aluminium Matrix Composites

Cited by 29 publications

References 56 publications

Effect of Copper Addition on the AlCoCrFeNi High Entropy Alloys Properties via the Electroless Plating and Powder Metallurgy Technique

Effect of Copper Addition on the AlCoCrFeNi High Entropy Alloys Properties via the Electroless Plating and Powder Metallurgy Technique

Enhancement of microstructural, mechanical and tribological properties of hybrid Al- CNTs through electroless deposition of innovative h-BNs contents coated Ag and Ni for purpose of ball bearing

Microstructural Characterization of In Situ Aluminum Matrix Composites with Interconnected Aluminum Nitride Produced by Arc Plasma-Induced Accelerated Volume Nitridation

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