Microstructural Evolution and Strengthening Mechanism of SiC/Al Composites Fabricated by a Liquid-Pressing Process and Heat Treatment

Shin, So Young; Cho, Seungchan; Lee, Dong-Hyun; Kim, Jae Won; Lee, Sang-Bok; Lee, Sang-Kwan; Jo, Ilguk

doi:10.3390/ma12203374

Cited by 18 publications

(7 citation statements)

References 27 publications

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“…Though the tensile strength is lower than that in novel processes [ 10 , 30 , 31 , 32 ], the bending strength and compression strength were greatly improved. The discrepancy in compression and tensile strength revealed a conversion in which the plasticity composite showed a small part of brittleness features after the resin addition.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties of Al Matrix Composite Enhanced by In Situ Formed SiC, MgAl2O4, and MgO via Casting Process

Jiao

Zhu

et al. 2021

Materials

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Al matrix composite, reinforced with the in situ synthesized 3C–SiC, MgAl2O4, and MgO grains, was produced via the casting process using phenolic resin pyrolysis products in flash mode. The contents and microstructure of the composites’ fracture characteristics were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Mechanical properties were tested by universal testing machine. Owing to the strong propulsion formed in turbulent flow in the pyrolysis process, nano-ceramic grains were formed in the resin pyrolysis process and simultaneously were homogeneously scattered in the alloy matrix. Thermodynamic calculation supported that the gas products, as carbon and oxygen sources, had a different chemical activity on in situ growth. In addition, ceramic (3C–SiC, MgAl2O4, and MgO) grains have discrepant contents. Resin pyrolysis in the molten alloy decreased oxide slag but increased pores in the alloy matrix. Tensile strength (142.6 ± 3.5 MPa) had no change due to the cooperative action of increased pores and fine grains; the bending and compression strength was increasing under increased contents of ceramic grains; the maximum bending strength was 378.2 MPa in 1.5% resin-added samples; and the maximum compression strength was 299.4 MPa. Lath-shaped Si was the primary effect factor of mechanical properties. The failure mechanism was controlled by transcrystalline rupture mechanism. We explain that the effects of the ceramic grains formed in the hot process at the condition of the resin exist in mold or other accessory materials. Meanwhile, a novel ceramic-reinforced Al matrix was provided. The organic gas was an excellent source of carbon, nitrogen, and oxygen to in situ ceramic grains in Al alloy.

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Section: Resultsmentioning

confidence: 99%

Mechanical Properties of Al Matrix Composite Enhanced by In Situ Formed SiC, MgAl2O4, and MgO via Casting Process

Jiao

Zhu

et al. 2021

Materials

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“…From the contour and 3D surface plots for variation of YS with varying wt.% of reinforcements at different heat treatment temperatures, it is clearly evident that the reinforcements and heat treatment increases the yield strength of the composites, attributed to Orowan strengthening facilitated by precipitation hardening. Shin et al [43] identified the microstructural evolution and strengthening mechanisms in Al/SiC composites en route the liquid pressing process, subsequently followed by the heat treatment process, which helps in increasing the strength due to solution heat treatment and artificial ageing, especially due to the formation of Mg 2 Si precipitates attributed to precipitation hardening. From the contour and 3D surface plots for variation of YS with varying wt.% of reinforcements at different heat treatment temperatures, it is clearly evident that the reinforcements and heat treatment increases the yield strength of the composites, attributed to Orowan strengthening facilitated by precipitation hardening.…”

Section:  Yield Strengthmentioning

confidence: 99%

Influence of Heat Treatment and Reinforcements on Tensile Characteristics of Aluminium AA 5083/Silicon Carbide/Fly Ash Composites

et al. 2021

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The effect of reinforcements and thermal exposure on the tensile properties of aluminium AA 5083–silicon carbide (SiC)–fly ash composites were studied in the present work. The specimens were fabricated with varying wt.% of fly ash and silicon carbide and subjected to T6 thermal cycle conditions to enhance the properties through “precipitation hardening”. The analyses of the microstructure and the elemental distribution were carried out using scanning electron microscopic (SEM) images and energy dispersive spectroscopy (EDS). The composite specimens thus subjected to thermal treatment exhibit uniform distribution of the reinforcements, and the energy dispersive spectrum exhibit the presence of Al, Si, Mg, O elements, along with the traces of few other elements. The effects of reinforcements and heat treatment on the tensile properties were investigated through a set of scientifically designed experimental trials. From the investigations, it is observed that the tensile and yield strength increases up to 160 °C, beyond which there is a slight reduction in the tensile and yield strength with an increase in temperature (i.e., 200 °C). Additionally, the % elongation of the composites decreases substantially with the inclusion of the reinforcements and thermal exposure, leading to an increase in stiffness and elastic modulus of the specimens. The improvement in the strength and elastic modulus of the composites is attributed to a number of factors, i.e., the diffusion mechanism, composition of the reinforcements, heat treatment temperatures, and grain refinement. Further, the optimisation studies and ANN modelling validated the experimental outcomes and provided the training models for the test data with the correlation coefficients for interpolating the results for different sets of parameters, thereby facilitating the fabrication of hybrid composite components for various automotive and aerospace applications.

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“…Some of the strengthening mechanisms that can be operative in MMCs are Orowan strengthening, Hall petch strengthening, dislocation strengthening, load transfer strengthening, thermal mismatch strengthening, grain refinement and work hardening. [17][18][19][20][21][22][23] Composite materials are normally classified according to the matrix material. MMCs consist of a metallic matrix and a dispersed metallic or ceramic phase.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, understanding the strengthening mechanisms and hence predicting the yield strength is important for fabricating high performance and quality MMC components. Some of the strengthening mechanisms that can be operative in MMCs are Orowan strengthening, Hall petch strengthening, dislocation strengthening, load transfer strengthening, thermal mismatch strengthening, grain refinement and work hardening 17‐23 …”

Section: Introductionmentioning

confidence: 99%

Advanced production routes for metal matrix composites

Mussatto

Ahad

Mousavian

et al. 2020

Engineering Reports

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The use of metal matrix composites (MMCs) in a variety of products is significantly increasing with time due to the fact that their properties can be tailored and designed to suit specific applications. However, the future usage of MMC products is very much dependent on their beneficial aspects and hence it is critical to ensure in a robust repeatable manner the superior physical property advantages compared to conventional unreinforced monolithic metal counterparts. Although numerous routes are available for production of MMC products, each of them has their own advantages and disadvantages. This article provides an overview of advanced production routes for MMCs. The discussion also highlights challenges and presents a future prospectus for MMCs. Powder metallurgy and casting routes are still extensively used for production of MMCs. Aluminum alloys are today the most commonly used matrix materials in MMC products.Carbides (eg, SiC, TiC, and B 4 C), carbon allotropes (eg, CNTs and graphene), and alumina (Al 2 O 3) are currently the most used reinforcement materials. Nevertheless, the use of nano and of hybrid reinforcements are seeing increased usage in niche applications. Additive manufacturing (AM) is discussed as a novel production route for MMC products. This process represents a promising method for the production of MMC products.

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Microstructural Evolution and Strengthening Mechanism of SiC/Al Composites Fabricated by a Liquid-Pressing Process and Heat Treatment

Cited by 18 publications

References 27 publications

Mechanical Properties of Al Matrix Composite Enhanced by In Situ Formed SiC, MgAl2O4, and MgO via Casting Process

Mechanical Properties of Al Matrix Composite Enhanced by In Situ Formed SiC, MgAl2O4, and MgO via Casting Process

Influence of Heat Treatment and Reinforcements on Tensile Characteristics of Aluminium AA 5083/Silicon Carbide/Fly Ash Composites

Advanced production routes for metal matrix composites

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