| SiCw／Al—12Ti复合材料裂纹扩展的SEM原位观察 |
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| 引用本文： | 贾德昌,周玉,雷廷权. SiCw／Al—12Ti复合材料裂纹扩展的SEM原位观察[J]. 材料研究学报, 1998, 12(2): 217-220 |
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| 作者姓名： | 贾德昌 周玉 雷廷权 |
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| 作者单位： | 哈尔滨工业大学 |
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| 摘 要： | 利用带缺口三点弯曲试样，原位观察了SiC品须含量不同的Al－12Ti基复合材料的裂纹扩展过程结果表明，随SiCw增加，裂纹由优先治Al3Ti颗粒／Al界面萌生与扩展转变成在Al3Tip内部和靠近SiCw端部的SiCw／Al界面萌生与扩展SiCw／Al-12Ti的强化机制以SiCw的桥接、拔出和诱导裂纹偏转强化为主，同时，SiCw与Al3Tip起到较好的互补强化作用
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| 关 键 词： | 复合材料 碳化硅 铝 钛 原位观察 |
| 收稿时间： | 1998-04-25 |
| 修稿时间： | 1998-04-25 |
THE IN-SITU SEM OBSERVATION OF CRACK PROMGATION OF SiC WHISKERS REINFORCED Al-12Ti COMPOSITES |
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| JIA Dechang,ZHOU Yu,LEI Tingquan. THE IN-SITU SEM OBSERVATION OF CRACK PROMGATION OF SiC WHISKERS REINFORCED Al-12Ti COMPOSITES[J]. Chinese Journal of Materials Research, 1998, 12(2): 217-220 |
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| Authors: | JIA Dechang ZHOU Yu LEI Tingquan |
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| Affiliation: | JIA Dechang,ZHOU Yu,LEI Tingquan(Box.,Harbin Institute of Technology,Harbin ) |
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| Abstract: | The crack propagation of SiC whiskers reinforced Al-12Ti composites with different SiC. content were in-situ observed under SEM using notched three-point-bending samples. It has been shown that microcracks are prone to nucleate within large Al3Ti particles and at SiCw/AI interfaces near SiC whiskers' tip zones other than at AI3Tip/AI interfaces with increasing SiCw content. The SiCw/AI-12Ti composites are strengthened principally through SiC whiskers' bridging. pulling-out and crack deflection mechanisms, moreover, SiC whiskers and AI3Ti particles effectively strengthen the AI matrix reciprocally. |
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| Keywords: | SiC_w/AI-12Ti composite crack propagation in-situ observation |
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