| Autor: |
Qi, Yan, Jia, Lina, Ye, Chengtong, Jin, Zuheng, Liu, Yanyu, Wang, Wenbo, Zhang, Hu |
| Zdroj: |
Journal of Materials Research and Technology; November-December 2023, Vol. 27 Issue: 1 p7521-7531, 11p |
| Abstrakt: |
In this work, SiCpreinforced Al–Si–Mg matrix composites were prepared by stirring casting with different SiCpsizes. The effect of SiCpsizes on the microstructure and mechanical properties was investigated, and different strengthening effects were systematically calculated and analyzed. With the decrease of SiCpsizes, the microstructure of composites is refined and the plasticity is improved significantly. The refined SiCpalso leads to a more intense grain refinement strengthening and thermal expansion mismatch strengthening. However, an abnormal decrease of yield strength is discovered with the refinement of SiCp, which is due to the influence of SiCpon GP zones strengthening in the matrix. As SiCpsizes decreasing, the increased SiCp/Al interfaces capture more Mg atoms, and then inhibits the formation of GP zones in the α-Al. Therefore, the refined SiCpweaken the precipitation strengthening in composites. These acicular Mg–Si GP zones exhibit a preferentially growing direction along <100>Aland present a same structure as α-Al with coherent interfaces which pin dislocations and provide precipitation strengthening. The high density of GP zones also increases nano-hardness and elastic modulus of α-Al, which improves the wear resistance of SiCp/Al–Si–Mg composites. Therefore, it is suggested that the interaction between the SiCpand precipitates in matrix should also be considered to obtain a suitable strengthening effect in the design of SiCp/Al alloy composites. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
