| 钴基高温合金尖塑性区位错结构的原位观察 |
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| 引用本文： | 吕铮,徐永波,胡壮麒. 钴基高温合金尖塑性区位错结构的原位观察[J]. 金属学报, 1998, 34(2): 129-133 |
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| 作者姓名： | 吕铮 徐永波 胡壮麒 |
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| 作者单位： | 中国科学院金属研究所材料疲劳与断裂国家重点实验室;沈阳,110015;中国科学院金属研究所材料疲劳与断裂国家重点实验室;沈阳,中国科学院金属研究所固体原;中国科学院金属研究所固体原子像开放实验室,沈阳,110015 |
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| 基金项目： | 国家自然科学基金!59671040 |
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| 摘 要： | 定向凝固的钴基高温合金在原位拉伸研究中发现了两种裂尖塑性区位错结构，在拉伸辊为［５１１］时，从裂尖发射的是不全位错，在整个塑性区中全错始终以扩展位错的形式存在；［１２１］时，从裂尖发射的是全位错，位错在离开裂尖向试样内部运动过程中发生扩展，分析了裂纹尖端应力状态对裂尖塑性区位错结构的影响。
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| 关 键 词： | 钴基合金 原位拉伸 位错 裂尖 高温合金 |
| 收稿时间： | 1998-02-18 |
| 修稿时间： | 1998-02-18 |
IN SITU OBSERVATION OF DISLOCATION BEHAVIOR IN PLASTIC ZONE AHEAD OF A CRACK-TIP IN A CO-BASE SUPERALLOY |
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| LU Zheng,XU Yongbo,HU Zhuangqi. IN SITU OBSERVATION OF DISLOCATION BEHAVIOR IN PLASTIC ZONE AHEAD OF A CRACK-TIP IN A CO-BASE SUPERALLOY[J]. Acta Metallurgica Sinica, 1998, 34(2): 129-133 |
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| Authors: | LU Zheng XU Yongbo HU Zhuangqi |
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| Affiliation: | LU Zheng,XU Yongbo,HU Zhuangqi (State Key Laboratory for Fatigue and Fracture of Materials,Institute of Metal Research,The Chinese Academy of Sciences,Shenyang )(Laboratory of Atomic Imaging of Solids,Institue of Metal Research,The Chinese Academy of Sciences,Shenyang ) |
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| Abstract: | This paper presents a study of dislocation behavior in a plastic zone ahead of a crack-tip in a Co-base superalloy during in situ deformation in a TEM. The results show that the dislocations emitted from the crack-tip are partials when the tensile acs is [51]. However,when the tensile axis is [121], the dislocations from the crack-tip are perfect, which will extend during their motion toward the matrix. The stress state ahead of the crack-tip and its effect on the dislocation behavior in the plastic zone were also analysed. |
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| Keywords: | Co-base superalloy in situ tensile dislocation crack-tip |
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