EFFECTS OF HOT-ROLLING PROCESSES ON THE FRACTURE BEHAVIORS AND MECHANICAL PROPERTIES OF 2009Al/SiCp METAL MATRIX COMPOSITES

Ze Wang; Zhiwen Liang; Qingxue Huang; Zixuan Li; Xiaomiao Niu

doi:10.17222/mit.2024.1101

Ze Wang College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China
Zhiwen Liang College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China
Qingxue Huang College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China
Zixuan Li Zhejiang Key Laboratory of Parts Rolling Technology, Ningbo 315211, PR China
Xiaomiao Niu Taiyuan University of Techonology

DOI: https://doi.org/10.17222/mit.2024.1101

Keywords: aluminum matrix composite, rolling process, microstructure evolution, fracture behavior, in-situ tensile test

Abstract

Defects such as pores and weak interfacial bonding in SiC-reinforced aluminum-matrix composites (AMCs) limit the reinforcement effect. The objective of this study is to control the microstructural defects and status of the Al/SiC interface in an 2009Al/SiCp composite using rolling processes. The influence of the rolling reduction rate on the microstructure and mechanical properties is investigated. The fracture behavior of the 2009Al/SiCp composite is observed through in-situ scanning-electron-microscopy tensile tests. The results demonstrate that an appropriate rolling reduction rate can effectively eliminate microstructural defects in the matrix and enhance the interfacial bonding strength of Al/SiC. Plastic deformation during the rolling processes expands the dislocation-strengthening regions near the Al/SiC interface. Consequently, mechanical loads can be more efficiently transferred from the aluminum matrices to SiC particles. In the as-sintered specimens, cracks primarily initiate at the Al/SiC interfaces during tensile tests. In contrast, cracks predominantly propagate from the SiC particles to Al matrices in the as-rolled specimens. This work provides a fundamental understanding of the dynamic changes in the microstructure and the resulting mechanical properties during hot rolling of SiC-reinforced AMCs.

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