In situ TEM observation of dislocation movement through the ultrafine obstacles in an Fe alloy
In situ TEM observation of dislocation movement through the ultrafine obstacles in an Fe alloy
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DOI：
10.1016/s0022-3115(02)01163-7
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发表时间：
2002-12
影响因子：
3.1
通讯作者：
K. Nogiwa;Takuya Yamamoto;K. Fukumoto;H. Matsui;Y. Nagai;K. Yubuta;M. Hasegawa
中科院分区：
文献类型：
--
作者：
K. Nogiwa;Takuya Yamamoto;K. Fukumoto;H. Matsui;Y. Nagai;K. Yubuta;M. Hasegawa
用透射电子显微镜原位观察研究了热时效Fe-Cu合金中位错通过超细障碍物的运动。提出了一种非常有效的定量估算辐射脆化的方法。从位错的临界脱出角φ估算了障碍强度。在剪切应力的增加，这是估计从平均强度的超细障碍物和平均距离之间的两个相邻的障碍物的位错在原位观察，是在很好的协议从宏观力学试验获得的硬化。该技术对于从实验观察和/或计算机模拟获得的微观结构预测辐照聚变和裂变反应堆材料的力学性能是非常有用的。
Dislocation movement through ultrafine obstacles in a thermally aged Fe–Cu alloy has been studied by in situ transmission electron microscope observation. A very effective technique for quantitative estimates of radiation embrittlement is proposed. The obstacle strength has been estimated from the critical bow-out angle, φ, of dislocations. The increase in shear stress, which is estimated from the averaged strength of ultrafine obstacles and the averaged distance between the two neighboring obstacles on a dislocation in the in situ observation, is in good agreement with the hardening obtained from macroscopic mechanical tests. This technique is very useful to predict the mechanical properties of irradiated fusion and fission reactor materials from the microstructure obtained from experimental observations and/or the computer simulations.