The influence on microstructure and wear behavior of hypereutectic Al-50Si alloy with various Cu-P admixture contents and cooling rates

Jiang, Tao; Fu, Jinyu; Xu, Bo; Xu, Guangming

doi:10.1088/2051-672x/ab337d

Cited by 5 publications

(4 citation statements)

References 32 publications

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“…Silicon carbide-reinforced aluminum-silicon (SiC/Al-Si) matrix composites have the advantages of low density, high specific strength, high dimensional stability, and high thermal conductivity and have been widely used in aerospace, automotive, electronics, and other fields [ 1 , 2 , 3 ]. The distribution of reinforcement in metal matrix composites has a significant effect on the strength, plasticity, and crack initiation of the composites [ 4 , 5 , 6 ]. Segurado et al [ 7 ] obtained composites with a non-uniform distribution of reinforcements, and their tensile strength was increased by 60% compared with uniformly distributed composites.…”

Section: Introductionmentioning

confidence: 99%

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Nano-Phase and SiC–Si Spherical Microstructure in SiC/Al-50Si Composites Solidified under High Pressure

et al. 2023

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The formation of coarse primary Si is the main scientific challenge faced in the preparation of high-Si Al matrix composites. The SiC/Al-50Si composites are prepared by high pressure solidification, which allows the primary Si to form a SiC–Si spherical microstructure with SiC, while the solubility of Si in Al is increased by high pressure to reduce the proportion of primary Si, thus enhancing the strength of the composites. The results show that the high melt viscosity under high pressure makes the SiC particles almost “fixed” in situ. The SEM analysis shows that the presence of SiC in the growth front of the primary Si will hinder its continued growth and eventually form SiC–Si spherical microstructure. Through aging treatment, a large number of dispersed nanoscale Si phases are precipitated in the α-Al supersaturated solid solution. The TEM analysis shows that a semi-coherent interface is formed between the α-Al matrix and the nanoscale Si precipitates. The three-point bending tests shows that the bending strength of the aged SiC/Al-50Si composites prepared at 3 GPa is 387.6 MPa, which is 18.6% higher than that of the unaged composites.

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Section: Introductionmentioning

confidence: 99%

“…When the Si content is more than 20%, coarse primary Si is easily formed, which leads to stress concentration and reduces the strength of the composite [ 6 ]. The formation of coarse primary Si is the main scientific challenge faced in the preparation of high-silicon aluminum matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Nano-Phase and SiC–Si Spherical Microstructure in SiC/Al-50Si Composites Solidified under High Pressure

et al. 2023

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“…When the Si content is more than 20%, coarse primary Si is easily formed, which leads to stress concentration and reduces the strength of the composite [ 4 ]. Establishing how to eliminate the adverse effect of the coarse primary Si is the key to improving the properties of high-Si Al alloys.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of SiC/Al-40Si Composites Fabricated by High Pressure Solidification

et al. 2023

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The microstructure and mechanical properties of SiC/Al-40Si composites prepared under high pressure were studied. As the pressure increases from 1 atm to 3 GPa, the primary Si phase in the Al-40Si alloy is refined. With increasing pressure, the composition of the eutectic point increases, the solute diffusion coefficient decreases exponentially, and the concentration of Si solute at the front of the solid–liquid interface of the primary Si is low, which contributes to the refining of the primary Si and inhibiting its faceted growth. The bending strength of SiC/Al-40Si composite prepared under 3 GPa was 334 MPa, which was 66% higher compared to the Al-40Si alloy prepared under the same pressure.

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“…Vehicle lightweight is an essential way to save energy. Since aluminum alloy material owns excellent lightweight, it is popular in the industry [1][2][3]. Besides, the hard silicon particles are added to soft aluminum matrix to enhance the wear resistance.…”

Section: Introductionmentioning

confidence: 99%

The influence of protruding silicon particle shape on the friction performance of Al–Si alloy

Chen

et al. 2020

Surf. Topogr.: Metrol. Prop.

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The surface of Al-Si alloy samples was produced by chemical etching and laser finishing. After both chemical etching and laser finishing, the silicon particles could be exposed on the surface, resulting in improving the friction performance of Al-Si alloy. The edge shapes of the protruding silicon particles were different in the two surface treatments. Besides, the edges of protruding silicon particles were sharp after chemical etching. As a result, the edges were damaged in friction, and even some of silicon particle could shed. Then, it was easy for the abrasive wear to occur on the surface. There were obvious vortices on both sides of protruding silicon particle with sharp edge in the fluid region, resulting in a comparatively weak lubrication. In contrast, the edges of protruding silicon particles were round after laser finishing. Moreover, silicon particles could be closely combined with aluminum matrix due to the rapid cooling after being heated by laser, meanwhile, it was difficult for them to be separated from the matrix during friction. There were no vortices occurring on both sides of protruding silicon particle with round edge in fluid region, presenting excellent lubrication. Besides, the samples by laser finishing owned a low friction coefficient. Thus, the Al-Si alloy samples by laser finishing, with round edges of silicon particle, exhibiting a better friction performance. Consequently, the micro-mechanisms of friction performance associated with the edge shape of protruding silicon particle such as better lubrication and uniform stress distribution of rounded edge were determined.

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The influence on microstructure and wear behavior of hypereutectic Al-50Si alloy with various Cu-P admixture contents and cooling rates

Cited by 5 publications

References 32 publications

Nano-Phase and SiC–Si Spherical Microstructure in SiC/Al-50Si Composites Solidified under High Pressure

Nano-Phase and SiC–Si Spherical Microstructure in SiC/Al-50Si Composites Solidified under High Pressure

Microstructural Evolution and Mechanical Properties of SiC/Al-40Si Composites Fabricated by High Pressure Solidification

The influence of protruding silicon particle shape on the friction performance of Al–Si alloy

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