| 显微结构对铝基陶瓷复合材料断裂的影响 |
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| 引用本文： | 卫家楣.显微结构对铝基陶瓷复合材料断裂的影响[J].南京林业大学学报(自然科学版),1996,20(1):58-62. |
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| 作者姓名： | 卫家楣 |
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| 作者单位： | 南京林业大学机械工程学院 南京210037 |
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| 摘 要： | 研讨了铝基陶瓷复合材料的显微结构和性能之间的关系。采用７０７５铝合金为金属基，并加入体积为２０％，粒度为Ｆ－１０００或Ｆ－６００的ＳｉＣ颗粒增强。通过塑性和断裂韧性测量以及试样断口的ＴＥＭ、ＳＥＭ显微观察，分析断裂显微结构的细节。研究表明，当基体从时效状态到过时效状态时，断裂模式从ＳｉＣ颗粒断裂转变为ＳｉＣ颗粒和基体之间出现窝状断裂。由ＴＥＭ观察证实，在过时效条件下基体和ＳｉＣ界面上沉淀析出新相，
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| 关 键 词： | 复合材料 显微结构 断裂韧性 陶瓷复合材料 |
MICROSTRUCTURAL EFFECTS ON THE FRACTURE IN THE ALUMINIUM MATRIX CERAMIC COMPOSITES |
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| Wei Jiamei.MICROSTRUCTURAL EFFECTS ON THE FRACTURE IN THE ALUMINIUM MATRIX CERAMIC COMPOSITES[J].Journal of Nanjing Forestry University(Natural Sciences ),1996,20(1):58-62. |
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| Authors: | Wei Jiamei |
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| Institution: | College of Mechanical Engineering Nanjing Forestry University Nanjing 210037 |
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| Abstract: | This paper deals with the microstructure-property relationship in metal-ceramic particulate reinforced composites. Metal matrix was 7075 aluminum alloy and was reinforced with 20% by volume of either F-600 grade or F-1000 grade SiC particulates. Through tensile ductility and fracture toughness, and by means of frac-tography of TEM and SEM, the details of the fracture were investigated. The result showed that fracture tended to initiate in clustered regions. A tendency to shift the fracture mode from particle cracking to dimpled fracture was observed as the matrix temper was varied from underaged to overaged. While TEM revealed a new phase of precipitation at the particle/matrix interface in the overaged and it accompanied a substantial decrease in toughness. |
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| Keywords: | Composites Microstructure Fracture toughness |
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