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

Author:

Zhang Rong12,Zou Chunming2,Wei Zunjie2ORCID,Wang Hongwei2

Affiliation:

1. School of Materials Science and Engineering, Fujian University of Technology, Fuzhou 350118, China

2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract

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.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Fujian Province

Scientific Research Foundation of Fujian University of Technology

“Head Goose” team project

Foundation of National Key Laboratory for Precision Hot Processing of Metals

Publisher

MDPI AG

Subject

General Materials Science

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