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Indexed by:期刊论文

Date of Publication:2022-06-29

Journal:稀有金属

Volume:39

Issue:4

Page Number:289-299

ISSN No.:0258-7076

Abstract:SiCp/Al composites, exhibiting high specific strength, high specific stiffness, high wear resistance, low thermal expansion coefficients and high thermal conductivity, are mainly used in key structural parts in the aeronautics and astronautics field. For the production of SiCp/Al composites, rolling is one of the most commonly used plastic working methods. Unfortunately, edge crack defects arising from the rolling of the SiCp/Al composites were apt to occur. The generation of edge cracks was related to the poor plasticity of SiCp/Al composites and the unreasonable height reduction. In order to accurately predict the rolling defect of SiCp/Al composites, a finite element model of rolling was developed based on the microstructure of SiCp/Al composites. Matrix damage, particle cracking and interface debonding were coupled in the model. The parameters of damage models were identified using best-fit methods. The rolling processes of SiCp/Al composites were simulated under relative reductions of 5%, 10%, 20% and 25%. The results showed that when the rolling reduction was 25%, the edge crack of the SiCp/Al composite plate was caused by tensile stress, which was produced by non-uniform deformation, leading to the damage of microstructures. The microstructure simulation results of SiCp/Al composites indicated that micro pores initiated at the interface between particles and matrix, and then propagated in the matrix until the composites failed. The simulation results agreed well with experimental results. Key words: ©, 2015, Editorial Office of Chinese Journal of Rare Metals. All right reserved.

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