Effect of CeO2 Content on Microstructure and Properties of SiCp/Al-Si Composites Prepared by Powder Metallurgy

Abstract

The effect of CeO2 content on the microstructure and properties of SiCp/Al-Si composites prepared by powder metallurgy was studied, and the mechanism of CeO2 in composites was deeply analyzed. The results show that the addition of the appropriate amount of CeO2 can refine the Si particles and improve the tensile properties of the SiCp/Al-Si composites. As the CeO2 content increases from 0 to 0.4 vol%, the particle size of the Si phase shows a tendency to decrease first and then increase, while the tensile strength, yield strength, and elongation of the composites show a trend of first increasing and then decreasing. When the CeO2 content is 0.2 vol%, the refining effect of CeO2 and the tensile properties of composites are the best. The fracture mode of SiCp/Al-Si composites with a rare earth addition is a mixed fracture. There are three main mechanisms for CeO2 in SiCp/Al-Si composites. One is when CeO2 serves as the nucleation substrate of Si phase to refine Si particles. The second is when CeO2 reacts with the alloying elements in the aluminum matrix to form a new phase, CeCu2Si2, which can not only play a role of dispersion strengthening, but also improve the bonding strength between Al matrix and Si particles. The third is the pinning effect of CeO2 and CeCu2Si2 particles on grain boundaries or phase boundaries to refine aluminum grains.

Mechanical, Wear, and Fracture Behavior of Titanium Diboride (TiB2) - Cerium Oxide (CeO2) Reinforced Al-6061 Hot-rolled Hybrid Composites

“…During the solidification process in cast composites, TiB 2 elements cause increase in the dislocation of density [33][34][35][36]. Xuedan Dong et al [10] observed that, when the CeO 2 content was increased, the mechanical properties of the composites were enhanced. Since, Stircasting technique is adopted for the purpose of fabrication of composites, this leads to obtain uniform bonding among reinforcement and matrix.…”

“…But, the wear rate reduced by increasing the TiC content. Xuedan Dong et al [10] studied the effect of CeO 2 particulates on micro-structure and mechanical behavior of Al composites. The outcomes showed that the presence of the suitable wt.…”

Al–Si–Cu–Mg Matrix Composites with Graphene: PM‐Based Production, Microstructural, and Mechanical Properties

“…Accordingly, it was reported that the primary precipitates in the structure were Al 4 Cu 9 , Al 2 Cu, and Al 5 Cu 6 Mg 2 phases. [29] Considering that graphene reveals many remarkable properties such as high surface area, high Young's Modulus, and fracture strength, [21,22] FLG-reinforced Al-Si(10 wt%)-Cu (2 wt%)-Mg (1 wt%) composites are estimated to display enhanced mechanical performance. Hence, the effects of FLG content and MA on the microstructural, mechanical, and tribological performances of the Al-10 wt% Si-2 wt% Cu-1 wt% Mg matrix were investigated in this study.…”

“…Accordingly, it was reported that the primary precipitates in the structure were Al 4 Cu 9 , Al 2 Cu, and Al 5 Cu 6 Mg 2 phases. [ 29 ]…”

A Study on Micro-structure, Hardness and Optimization of Wear Characteristics of Al6061/TiB2/CeO2 Hotrolled MMCs using Taguchi Method

“…Increasing the weight percentage of CeO 2 improved the mechanical characteristics of Al in all composite samples, with porosities reaching their maximum level. The impact of CeO 2 particles on the microstructure and mechanical behaviour of Composite materials was researched by Xuedan Dong [15]. The results demonstrated that the MMCs' tensile strength was enhanced by the appropriate weight percentage of CeO 2 .…”