Cryogenic Flow Behavior of SiCp/Al Composite and Construction of Constitutive Model
GUO Weicheng1,*, WU Jie1, GUO Miaoxian1, SUN Qimeng2
1 School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China 2 Dynamic Machinery Institute of Inner Mongolia, Hohhot 010010, China
Abstract: Silicon carbide particle-reinforced aluminum matrix composites (SiCp/Al) are widely used in aerospace field due to the excellent comprehensive performance, and cryogenic treatmenthas been proved to be able to further enhance the material properties in the material forming process. In the face of highly demanding industrial requirements, the study of the rheological properties of SiCp/Al at cryogenic temperatures is particularly important. In this work, the quasi-static tensile test of 20% SiCp/Al at -196 ℃ was carried out with electronic tensile machine. Dynamic compression tests at the temperature range of -196—20 ℃ and the strain rate range of 1 000~3 000 s-1 were carried out with the split Hopkinson pressure bar. The results show that the strain rate strengthening effect of SiCp/Al is not significant, while cryogenic temperature has a great strengthening effect on the flow stress of the material. The deformation mechanism of the flow behavior is analyzed by combining the dislocation movement, strain hardening and dynamic recrystallization softening. The coupling effect of strain, temperature and strain rate on the rheological properties of the material is considered to modify the established Johnson Cook model. It is found that the modified Johnson Cook (MJC) model could properly reflect the flow stress under different conditions, and the prediction error is reduced by more than 50%.
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2025, Vol. 39 
