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首页> 外文期刊>Applied composite materials >Effect of Thermal Exposure on the Interface Microstructure and Interfacial Shear Strength of the SiC Fiber Reinforced AlFe5Si2 Matrix Composite
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Effect of Thermal Exposure on the Interface Microstructure and Interfacial Shear Strength of the SiC Fiber Reinforced AlFe5Si2 Matrix Composite

机译：热暴露对SiC纤维增强Alfe5Si2基质复合材料界面微观结构和界面剪切强度的影响

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摘要

The effect of high temperature on the interface microstructure and interfacial shear strength of the continuous SiC fiber reinforced AlFe5Si2 matrix (45 vol.% SiCf/AlFe5Si2) composite was investigated. The composite was prepared by hot isostatic pressing (HIP), and then thermally exposed at 260/300/350/400/450 degrees C for 20/50/100 h, respectively. The interfacial shear strength of the composite with and without thermal exposure was measured by push-out test. The interface microstructure and phase compositions of the composite with and without thermal exposure were characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Results showed that the interfacial reaction took place at the interface between SiC fiber and aluminum matrix and formed Al4C3 phase during the preparation process. The activation energy of Al4C3 growth at the C/Al interface was about 163 kJ/mol. With increasing the thermal exposure temperature and time, the interfacial shear strength of the composite declined, especially at temperatures above 400 degrees C. The brittle Al3.21SiO0.47 compound formed at temperatures above 400 degrees C mainly resulted in the severe strength deterioration of the interfacial reaction zone.
机译：研究了高温对连续SiC纤维增强AlFE5SI2基质的界面微观结构和界面剪切强度的影响（45体积％SICF / ALFE5SI2）复合材料。通过热等静压（臀部）制备复合材料，然后分别在260/300/350/400/450℃下热暴露20/50/100h。通过推出试验测量具有和不具有热暴露的复合材料的界面剪切强度。通过扫描电子显微镜，透射电子显微镜和X射线衍射，表征复合材料的界面微观结构和相结合物。结果表明，界面反应发生在SiC纤维和铝基质之间的界面处，并在制备过程中形成Al 4C3相。 C / Al界面的Al 4C3生长的活化能量为约163kJ / mol。随着热曝光温度和时间的增加，复合材料的界面剪切强度下降，特别是在400℃的温度下。在400℃的温度下形成的脆性Al3.21siO 0.47化合物主要导致严重的强度劣化界面反应区。

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