ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Microcrack healing mechanism and microstructure properties of SiC/Al composites modified by high frequency pulse current
Received date: 2023-02-22
Revised date: 2023-03-20
Accepted date: 2023-03-27
Online published: 2023-04-07
Supported by
National Natural Science Foundation of China(52205405);Fundamental Research Program of Shanxi Province(20210302124653);Taiyuan University of Technology School Foundation(2022QN151);Science and Technology Innovation Program of Higher Education Institutions in Shanxi Province(2021L068)
High-frequency pulsed current technique was employed to modify the microstructure and performance of as-rolled SiC/Al composites. The microstructure of the composites in different states was observed and analyzed by Scanning Elcetron Microscopy （SEM） and Electron Back-Scattered Diffraction （EBSD）. The dynamic healing mechanism of microcrack under high frequency pulse current was investigated. Finally， the micro-nano mechanical properties and tensile properties of the composites were tested. Results show that the high frequency pulse current can effectively promote the static recrystallization of the as-rolled composite.Grain size was refined from 2.47 μm to 2.02 μm， and recrystallization ratio increased from 7.34% to 39.73%， which results in the weakening of the preference orientation. Micro-crack tips prefabricated by the drilling and cold rolling method were partially healed under the action of high temperature and pressure stress induced by high frequency pulse current. Tensile strength and elongation of the as-rolled composites were optimized from 347 MPa and 12.23% to 475 MPa and 21.65% after high frequency pulse current treatment. This research laid the theoretical and practical foundation for the expansion of SiC/Al composites in aviation field.
Ruifeng LIU , Xiaozhe SUN , Wenhui LI , Xian WANG , Jie YAN . Microcrack healing mechanism and microstructure properties of SiC/Al composites modified by high frequency pulse current[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(22) : 428598 -428598 . DOI: 10.7527/S1000-6893.2023.28598
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