Effects of impurities on one-dimensional migration of interstitial clusters in iron under electron irradiation
Effects of impurities on one-dimensional migration of interstitial clusters in iron under electron irradiation
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电子辐照下杂质对铁中间隙团簇一维迁移的影响
DOI：
10.1103/physrevb.77.094135
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发表时间：
2008
影响因子：
3.7
通讯作者：
T. Hamaoka
中科院分区：
文献类型：
--
作者：
Y. Satoh;H. Matsui;T. Hamaoka
使用高压电子显微镜研究了室温下电子辐照下不同纯度 Fe 样品的小间隙型位错环的一维 (1D) 迁移。大多数一维迁移表现为不规则间隔的离散跳跃（逐步位置变化），有时涉及某些点之间的来回运动。高纯度样品中跳跃距离的分布扩展至100 nm以上；低纯度样品中小于 30 nm。跳跃频率几乎与电子束强度成正比，并且与电子照射引起的原子位移速率处于同一量级。分子动力学模拟表明，位于团簇膨胀应变场中的超大溶质铜原子抑制了间隙团簇 (7i) 的一维迁移。我们提出一维跳跃过程按以下顺序发生：（1）由于杂质原子的捕获效应，间隙团簇处于静止状态；（2）入射电子撞击并取代杂质原子导致去捕获；（3）释放的团簇在低活化能下引起快速一维迁移；（4）团簇再次被另一种杂质捕获。根据所提出的模型对实验结果进行了分析和讨论。
One-dimensional (1D) migration of small interstitial-type dislocation loops was studied for Fe specimens of different purities at room temperature under electron irradiation using a high-voltage electron microscope. Most 1D migration appeared as discrete jumps (stepwise positional changes) at irregular intervals, and sometimes involved back and forth motion between certain points. The distribution of jump distances extended to over 100 nm in high-purity specimens; it was less than 30 nm in low-purity specimens. Jump frequency was almost proportional to electron beam intensity and was on the same order as the rate of atomic displacement by electron irradiation. Molecular dynamics simulation suggested the suppression of 1D migration of an interstitial cluster (7i) by an oversized solute Cu atom located in the dilatational strain field of the cluster. We proposed that the 1D jump process occurs in the following sequence: (1) interstitial clusters are in a stationary state due to trapping effect by impurity atoms, (2) incident electrons hit and displace impurity atom to cause detrapping, (3) liberated clusters cause fast 1D migration at low activation energy, and (4) the cluster is trapped again by another impurity. Experimental results were analyzed and discussed in terms of the proposed model.
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位移级联条件下铜缺陷簇的稳定性和迁移性
DOI：
--
发表时间：
2003
期刊：
Journal of Nuclear Materials 323
影响因子：
--
作者：
H.Abe;T.Tadokoro;Y.Yang;N.Sekimura
通讯作者：
N.Sekimura
影响因子：
1.6
作者：
Osetsky, YN;Bacon, DJ;Golubov, SI
通讯作者：
Golubov, SI
HVEM 辐照下钒和 V-5Ti 中 SIA 型环滑行运动的原位观察
DOI：
--
发表时间：
2002
期刊：
Journal of Nuclear Materials 307-311
影响因子：
--
作者：
H.Takano;N.Osakabe;K.Nogiwa 他
通讯作者：
K.Nogiwa 他
影响因子：
3.1
作者：
Arakawa, K;Hatanaka, M;Ono, K
通讯作者：
Ono, K
影响因子：
8.6
作者：
Arakawa, K;Hatanaka, M;Mori, H
通讯作者：
Mori, H