| Zn单晶解理裂纹前端的范性行为 |
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| 引用本文： | 傅苒,龙起易,张天宜,龙期威.Zn单晶解理裂纹前端的范性行为[J].材料研究学报,1990,4(1):14-19. |
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| 作者姓名： | 傅苒 龙起易 张天宜 龙期威 |
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| 作者单位： | 中国科学院金属研究所 沈阳110015
(傅苒，龙起易，张天宜)，中国科学院金属研究所 沈阳110015(龙期威) |
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| 摘 要： | 用蚀坑法观察了 Zn 单晶解理裂纹前端位错。结果表明,裂纹前端位错密度分布具有 DFZ模型预言的特征,且裂纹尖端与第一个位错的距离 X_1(即 DFZ 值)以及范性区位错数 N 均与根据Majumdar 和 Burns 的 DFZ 理论推算数值吻合较好。在此基础上,对裂纹前端发射位错和位错屏蔽裂纹前端等问题作了讨论。
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| 关 键 词： | 位错蚀坑 无位错区 有效应力强度因子 |
| 收稿时间： | 1990-02-25 |
| 修稿时间： | 1990-02-25 |
CLEAVAGE CRACK TIP DEFORMATION IN ZINC SINGLE CRYSTAL |
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| FU Ran,LONG Qiyi,ZHANG Tianyi,LONG Qiwei.CLEAVAGE CRACK TIP DEFORMATION IN ZINC SINGLE CRYSTAL[J].Chinese Journal of Materials Research,1990,4(1):14-19. |
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| Authors: | FU Ran LONG Qiyi ZHANG Tianyi LONG Qiwei |
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| Affiliation: | FU Ran,LONG Qiyi,ZHANG Tianyi,LONG Qiwei(Institute of Metal Research,Academia Sinica) |
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| Abstract: | Dislocation distribution ahead of a cleavage crack tip in Zn single crystal isobserved by using etch pit technique.The results show that this distribution has the featurepredicated by the DFZ models,and both X_1,the distance from the crack tip to the first dis-location,and N_0,the total number of dislocations ahead of the crack tip,agree withMajumdar and Burns'DFZ theory.The problems of dislocation emission from the cracktip and dislocation shielding effect on the crack tip are also discussed based on the experi-mental results. |
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| Keywords: | dislocation etch-pit dislocation-free zone effective stress intensity factor |
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