高频脉冲电流改性SiC/Al复合材料微裂纹愈合机制及组织性能

doi:10.7527/S1000-6893.2023.28598

Abstract

Abstract:

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.

Key words: SiC/Al composite, high frequency pulse current, grain refinement, microcrack healing, recrystallization

CLC Number:

V261.3

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 Aeronautica et Astronautica Sinica, 2023, 44(22): 428598-428598.

Figures/Tables 14

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复合材料状态	再结晶比例/%	亚结构比例/%	变形晶粒比例/%	平均晶粒尺寸/μm	KAM值
轧制态	7.43	5.33	87.24	2.47	4.51
5 kHz电流处理态	16.51	6.24	77.25	2.80	4.37
10 kHz电流处理态	39.73	7.33	52.94	2.04	3.82
15 kHz电流处理态	20.74	7.63	71.63	2.75	3.48

温度/℃	密度/（kg∙m^-3）	电阻率/（10^-8 Ω∙m）	热导率/（W∙m^-1∙K^-1）	线膨胀系数/（10^-5 K^-1）	弹性模量/GPa	泊松比
25	2 811.2	3.45	121.10	2.30	71.1	0.33
100	2 796.5	4.62	129.40	2.46	65.2	0.33
200	2 775.6	5.80	138.60	2.67	56.3	0.33
300	2 753.4	7.00	146.60	2.88	38.0	0.33
400	2 729.8	8.14	154.10	3.10	31.5	0.33
500	2 704.9	9.32	160.50	3.33	25.0	0.33
600	2 630.0	0.11	131.60	3.95	24.0	0.33
700	2 477.9	0.12	83.86	5.11	22.5	0.33

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Microcrack healing mechanism and microstructure properties of SiC/Al composites modified by high frequency pulse current

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