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孔旭,王玉敏,杨青,边舫,张旭,张国兴,杨丽娜,吴颖,杨锐.SiCf/Ti6242复合材料热机械疲劳损伤原位研究[J].稀有金属材料与工程(英文),2020,49(3):933~938.[Kong Xu,Wang Yumin,Yang Qing,Bian Fang,Zhang Xu,Zhang Guoxing,Yang Lina,Wu Ying and Yang Rui.In situ detection of damage in the SiCf/Ti6242 composite during the thermomechanical fatigue test[J].Rare Metal Materials and Engineering,2020,49(3):933~938.]
In situ detection of damage in the SiCf/Ti6242 composite during the thermomechanical fatigue test
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Received:January 10, 2019  Revised:June 28, 2019
DOI:
Key words: titanium matrix composites  thermomechanical fatigue  acoustic emission  X-ray tomography
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Author NameAffiliation
Kong Xu,Wang Yumin,Yang Qing,Bian Fang,Zhang Xu,Zhang Guoxing,Yang Lina,Wu Ying and Yang Rui  
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Abstract:
      In the paper, the damage of the SiCf/Ti6242 composite in the thermomechanical fatigue test was monitored by the acoustic emission technique and the high-resolution X-ray tomography. The thermomechanical fatigue test was conducted with a trapezoidal waveform to simulate the actual loading of the bladed ring. The applied stress range is 130–1300 MPa and the temperature range is 100–500 °C. The maximum stress was held for 2 min at 500 °C. The AE events emerged mainly in the loading stage and the dwell stage for the cycle where the AE signals of fiber fracture and matrix cracking were found. The matrix cracks of the unbroken specimen were detected by the high-resolution X-ray tomography. The necking of the tungsten filament in the broken fiber in the cracking region was also found. These results show that the damage mechanism of the specimen is dominated by a mixture of fiber fracture and matrix cracking.