The thermal expansion and mechanical properties of high reinforcement content SiCp/Al composites fabricated by squeeze casting technology

“…Fabrication technology of MMC involves stirring casting [4,5], powder metallurgy [6][7][8], squeeze casting [9][10][11], and semisolid stirring [12][13][14]. In addition, selective laser melting (SLM) was employed to fabricate high-performance alloys and MMC [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical Properties and Wear Behavior of the Rheoformed 2024 Aluminum Matrix Composite Component Reinforced by Al2O3 Nanoparticles

Jiang

Xiao

Che

et al. 2018

Metals

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Abstract:The 2024 nanocomposite reinforced with Al 2 O 3 nanoparticles was fabricated by the ultrasonic assisted semisolid stirring (UASS) method and rheoformed into a cylinder component. Microstructure, mechanical properties, and wear behavior of the rheoformed composite components were investigated. The results showed that the composite components with complete filling status and a good surface were rheoformed successfully. The deformation of semisolid slurries was mainly dominated by flow of liquid incorporating solid grains (FLS), sliding between solid grains (SSG), and plastic deformation of solid grains (PDS). Mechanical properties of the rheoformed composite components were influenced by stirring temperature, stirring time, and volume fraction of Al 2 O 3 nanoparticles. The optimal ultimate tensile strength (UTS) of 358 MPa and YS of 245 MPa were obtained at the bottom of the rheoformed composite components after a 25-min stirring of composite semisolid slurry with 5% Al 2 O 3 nanoparticles at 620 • C. Enhancement of mechanical properties was attributed to high density dislocations and dislocation tangles and uniform dispersed Al 2 O 3 nanoparticles in the aluminum matrix. Natural ageing led to the occurrence of needle-like Al 2 CuMg phase and short-rod-like Al 2 Cu phase. UTS of 417 MPa and YS of 328 MPa of the rheoformed composite components were achieved after T6 heat treatment. Improvement of mechanical properties is due to the more precipitated needle-like Al 2 CuMg phase and short-rod-like Al 2 Cu phase. Wear resistance of the rheoformed composite components was higher than that of the rheoformed matrix component. Wear resistance of the rheoformed composite component increased with an increase in Al 2 O 3 nanoparticles from 1% to 7%. A slight decrease in wear rate resulted from 10% Al 2 O 3 nanoparticles due to greater agglomeration of Al 2 O 3 nanoparticles. A combination mechanism of adhesion and delamination was determined according to worn surface morphology.

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“…Particle reinforced aluminum matrix composite (PRAMC) has received much attention because of their improved specific strength and modulus, good wear resistance, and modified thermal properties [1][2][3][4]. Wear behavior is an important evaluation parameter of the PRAMC.…”

Section: Introductionmentioning

confidence: 99%

“…Abdollahi et al [5] investigated dry sliding tribological behavior of Al2024-5 wt. % B 4 C nanocomposite fabricated by mechanical milling and hot extrusion and found that mechanical milling and adding B 4 C increased the wear resistance of the nanocomposite. Kumar et al [6] reported dry sliding wear behavior of stir cast AA6061-T6/AlN p composite and developed a regression model predicting wear rate.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, some research has focused on wear properties of the PRAMC fabricated by SSP. Mazahery and Shabani [22] investigated the wear behavior of the sol-gel coated B 4 C particle reinforced A356 matrix composites and concluded that the wear rate of the composites reinforced with coated B 4 C was less than that of the matrix alloy and decreased with increasing volume fraction of B 4 C particles. The research results of wear behavior of the rheocasted SiC p /Al metal matrix composites (MMC) showed that the wear rate of the 11% SiC MMC was higher than that of the 50% SiC MMC [23].…”

Section: Introductionmentioning

confidence: 99%

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Tribological Behavior of Nano-Sized SiCp/7075 Composite Parts Formed by Semisolid Processing

Jiang

Xiao²,

Wang³

et al. 2018

Metals

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Abstract:The tribological behavior of the rheoformed and thixoformed nano-sized SiC p /7075 composite parts is investigated. The semisolid stirring temperature has a little influence on the friction coefficient and wear resistance of the rheoformed composite parts. As for the thixoformed composite parts, the average value of the steady-state coefficient of friction increases firstly and then decreases with increasing reheating temperature. Higher wear resistance is achieved at a reheating temperature of 580 • C. The average value of the steady-state friction coefficient of the rheoformed composite parts varies from 0.37 to 0.45 upon applied loads of from 20 to 50 N. Weight loss increases slightly upon an increase of applied load from 20 to 40 N. An applied load of 50 N leads to a significant increase of the weight loss. The wear rate decreases firstly and then increases with increasing applied load. As for the thixoformed composite part, the average value of the steady-state friction coefficient and the weight loss decreased with an increasing applied load. However, the wear rate decreases firstly with increasing applied load and then increases. As for the rheoformed composite part, the average value of the steady-state friction coefficient decreases firstly and then increases a little with increasing sliding velocity. Weight loss and wear rate show a first increase and a followed decrease with increasing sliding velocity. As for the thixoformed composite part, the average value of the steady-state friction coefficient shows a decrease with increasing sliding velocity. Weight loss and wear rate exhibit, at first, an increase, and then a decrease with increasing sliding velocity. The average friction coefficient varies from 0.4 to 0.44 with increasing volume fraction of SiC. Weight loss and wear rate decrease with increasing volume fraction of SiC. An increase in dislocation density around the nano-sized SiC particles and the mismatch of the coefficient of thermal expansion (CTE) between 7075 matrix and nano-sized SiC particles during solidification improve the wear resistance of the composite. The dominant wear mechanisms of the rheoformed and thixoformed composite parts are adhesive wear, abrasive wear and delamination wear.

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The thermal expansion and mechanical properties of high reinforcement content SiCp/Al composites fabricated by squeeze casting technology

Cited by 94 publications

References 11 publications

Mechanical and thermal properties of nanocarbon-reinforced aluminum matrix composites at elevated temperatures

Mechanical and thermal properties of nanocarbon-reinforced aluminum matrix composites at elevated temperatures

Microstructure, Mechanical Properties and Wear Behavior of the Rheoformed 2024 Aluminum Matrix Composite Component Reinforced by Al2O3 Nanoparticles

Tribological Behavior of Nano-Sized SiCp/7075 Composite Parts Formed by Semisolid Processing

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