| 位错发射与纳米裂纹形核的TEM实验观察 |
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| 引用本文： | 丘波,钱才富,李惠芳,高克玮.位错发射与纳米裂纹形核的TEM实验观察[J].北京化工大学学报(自然科学版),2006,33(4):34-36. |
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| 作者姓名： | 丘波 钱才富 李惠芳 高克玮 |
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| 作者单位： | 北京化工大学机电工程学院,北京,100029;北京科技大学材料物理系,北京,100083 |
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| 摘 要： | 本文进行了1Cr18Ni9Ti（奥氏体321型不锈钢）的TEM原位拉伸实验，再次观察到了位错从裂纹尖端的发射、无位错区形成、纳米裂纹形核及位错塞积等物理现象。其中无位错区更是形状清楚，和理论计算结果吻合，无位错区中的纳米裂纹形核与长大验证了微孔聚合的裂纹扩展机理。
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| 关 键 词： | TEM原位观察 位错发射 无位错区 |
| 收稿时间： | 2005-09-15 |
| 修稿时间： | 2005年9月15日 |
TEM observation of dislocation emission and nano-crack nucleation |
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| QIU Bo,QIAN Cai-fu,LI Hui-fang,GAO Ke-wei.TEM observation of dislocation emission and nano-crack nucleation[J].Journal of Beijing University of Chemical Technology,2006,33(4):34-36. |
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| Authors: | QIU Bo QIAN Cai-fu LI Hui-fang GAO Ke-wei |
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| Institution: | 1. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; 2. Department of Materials Physics, University of Science and Technology, Beijing, Beijing 100083, China |
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| Abstract: | In-situ TEM observation was carried out on an austenitic stainless steel.Dislocation emission from the crack tip,formation of dislocation-free zones,nucleation of nano-cracks and dislocation pile-ups were all observed.The shape of the dislocation-free zone was clear and consistent with results of theoretical calculations.Nucleation and growth of nano-cracks in the dislocation-free zone verified that the crack growth mechanism involves micro-crack coalescence. |
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| Keywords: | in-situ TEM dislocation emission dislocation-free zone |
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