The microstructures and mechanical properties of a 5vol%SiC/AA2024 nanocomposite fabricated by powder metallurgy

Mu, Dikunqi; Zhang, Z.; Xie, Yuehuang; Liang, Jiamiao; Wang, J.; Zhang, D.L.

doi:10.1016/j.matchar.2021.111090

Cited by 31 publications

(7 citation statements)

References 45 publications

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“…During cooling after the hot-pressing process of Al2024 alloy, Al 2 Cu and Al 2 CuMg phases are formed by precipitation. 28 Additionally, the B 4 C and SiC reinforcement particles do not react with the base material. As a result, the grinding time was not sufficient for the formation of the reaction, and the sintering temperature was low.…”

Section: Resultsmentioning

confidence: 99%

The effects of different types and ratios of reinforcement, and machining processes on the machinability of Al2024 alloy nanocomposites

Karabacak

Çanakçı

Özkaya

et al. 2023

Journal of Composite Materials

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In the presented study, aluminum metal matrix nanocomposites reinforced with SiC and B4C, with different reinforcement ratios (0–4 wt%), have been prepared using the powder metallurgy method. The main objective of this study is to investigate the effect of different reinforcements and reinforcement amounts on the machinability of metal matrix nanocomposites using different machining processes (WEDM and CNC milling). The surface morphologies of the samples were investigated before and after machining using scanning electron microscopy and chemical analysis of the samples was obtained using EDX and X-ray diffraction. The surface hardness, roughness, and metal removal rate (MRR) before and after machining were examined to investigate the effect of the machining process on the surfaces of the samples. According to the results of the study, the hardness value of the nanocomposite containing 4% B4C by weight (195.6 HB) increased by approximately 90% compared to the hardness value of the pure Al2024 alloy (101.6 HB). After both machining processes, the hardness values of all nanocomposites decreased. In addition, the tensile strength values of the nanocomposites containing 2% B4C and SiC by weight are 392.8 MPa and 377.7 MPa, respectively, while the tensile strength value of the pure Al2024 alloy is 201.7 MPa. After both machining processes, the hardness values of all nanocomposite samples decreased. While the MRR values decreased with the increase in the reinforcement amount of the nanocomposites after machining, the SR values decreased.

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Section: Resultsmentioning

confidence: 99%

The effects of different types and ratios of reinforcement, and machining processes on the machinability of Al2024 alloy nanocomposites

Karabacak

Çanakçı

Özkaya

et al. 2023

Journal of Composite Materials

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“…The fine equiaxed grains possibly resulted from the dynamic recrystallization, while the elongated coarse grains likely came from the abnormal grain growth during the SPS process. The high grain boundary energy related to the large area of grain boundaries due to the long time spent ball-milling could provide the extra thermodynamic driving force, helping grain growth [ 20 ]. After T6 heat treatment, the 1SNC-HT sample maintained a similar microstructure with a slight loss of grain size, from 424 to 411 nm, as displayed in Figure 5 a,b and Figure 6 a,b.…”

Section: Discussionmentioning

confidence: 99%

“…However, it is not easy to develop an improved procedure for simultaneously enhancing the strength and ductility. Recently, heterostructured metallic materials, including heterogeneous laminate structure [ 18 ], gradient structure [ 19 ], and bimodal structure [ 20 , 21 ], have attracted extensive attention from the materials research community. These diverse structures have a common feature: all of them consist of both soft domains and hard domains with dramatically different flow stresses.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Microstructures and Mechanical Properties of SiC/AA2024 Nanocomposites Processed by Powder Metallurgy and T6 Heat Treatment

Zhang

Liang

et al. 2022

Materials

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SiC/AA2024 nanocomposites with 1 and 5 vol.% SiC nanoparticles have been prepared by a powder metallurgy route involving high-energy ball-milling (HEBM), spark plasma sintering (SPS), and hot extrusion. The microstructures and mechanical properties of the nanocomposite samples before and after T6 heat treatment were investigated. The samples exhibited a bimodal microstructure with SiC nanoparticles being dispersed in it. With increasing the SiC nanoparticle content from 1 to 5 vol.%, the yield strength (YS) and ultimate tensile strength (UTS) increased and the elongation to fracture (El) slightly decreased. After T6 heat treatment, a simultaneous improvement of the strength and ductility was observed, with the YS, UTS, and El increasing from 413 MPa, 501 MPa, and 5.4% to 496 MPa, 572 MPa, and 6.7%, respectively, in the 1 vol.%SiC/AA2024 nanocomposite sample. Analysis of the deformation behavior shows that this improvement is likely caused by the increased density of geometrically necessary dislocations (GNDs) resulting from the bimodal microstructure. The dispersed intragranular Sʹ precipitates generated by the T6 heat treatment also make a contribution to the increase of strength and ductility by accumulating dislocations. It is feasible to realize simultaneous improvement of strength and ductility in the SiC/AA2024 nanocomposites via powder metallurgy and subsequent heat treatment.

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“…Due to its wide band gap value, high breakdown electric field, good thermal and electrical conductivity, and high hardness and mechanical strength, SiC can be applied in the electronic (e.g., high power/high frequency devices) or automotive (e.g., brake discs) industry. [1] Silicon carbide is also used as the reinforcement in metal, [2][3][4][5][6][7][8] ceramic, [9,10] or polymer matrix composites. [11,12] SiC addition can improve the thermal or mechanical properties, [13] especially in the case of metal matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of Ni-SiC Composites Manufactured by Spark Plasma Sintering

Chmielewski

Zybała

Strojny-Nędza

et al. 2023

Metall Mater Trans A

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The presented paper concerns the technological aspects of the interface evolution in the nickel-silicon carbide composite during the sintering process. The goal of our investigation was to analyse the material changes occurring due to the violent reaction between nickel and silicon carbide at elevated temperatures. The nickel matrix composite with 20 vol pct SiC particles as the reinforcing phase was fabricated by the spark plasma sintering technique. The sintering tests were conducted with variable process conditions (temperature, time, and pressure). It was revealed that the strong interaction between the individual components and the scale of the observed changes depends on the sintering parameters. To identify the microstructural evolution, scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy, X-ray diffraction, and Raman spectroscopy were used. The silicon carbide decomposition process progresses with the extension of the sintering time. As the final product of the observed reaction, new phases from the Ni-Si system and free carbon were detected. The step-by-step materials evolution allowed us to reveal the course of the reaction and the creation of the new structure, especially in the reaction zone. The detailed analysis of the SiC decomposition and formation of new components was the main achievement of the presented paper.

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The microstructures and mechanical properties of a 5vol%SiC/AA2024 nanocomposite fabricated by powder metallurgy

Cited by 31 publications

References 45 publications

The effects of different types and ratios of reinforcement, and machining processes on the machinability of Al2024 alloy nanocomposites

The effects of different types and ratios of reinforcement, and machining processes on the machinability of Al2024 alloy nanocomposites

Investigation of Microstructures and Mechanical Properties of SiC/AA2024 Nanocomposites Processed by Powder Metallurgy and T6 Heat Treatment

Microstructural Evolution of Ni-SiC Composites Manufactured by Spark Plasma Sintering

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