The recovery of gas-vacancy-complexes in Fe irradiated with high energy H or He ions
The recovery of gas-vacancy-complexes in Fe irradiated with high energy H or He ions
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DOI：
10.2320/matertrans.45.9
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发表时间：
2004-01-01
影响因子：
1.2
通讯作者：
Nagata, S
中科院分区：
文献类型：
--
作者：
Ishizaki, T;Xu, Q;Nagata, S
利用等时退火实验研究了H或He离子辐照Fe后气体原子与空位团簇的相互作用。H和He离子的加速能分别为1.0 MeV和3.3 MeV。总剂量为1.0 × 10 ~（21）H离子/m ~ 2（0.2dpa）和9.6 × 10 ~（19）He离子/m ~ 2（0.3dpa），辐照温度为300 ℃。正电子湮没寿命和符合多普勒展宽（CDB）的测量进行后，照射和退火1小时的完全恢复温度。在H或He离子辐照后检测到微空隙。其特征差异主要表现在空位型缺陷的恢复上。H离子辐照引入的空位型缺陷在450 ℃完全恢复，而He离子辐照引入的空位型缺陷在1000 ℃完全恢复。这表明H空位复合物的稳定性不如He空位复合物。此外，氦离子辐照形成的空位团在600 ℃退火后长大。这是由于He原子从小的He空位团中发射出来，自由空位与空位团之间的合并，以及He气泡的迁移和合并造成的。
Isochronal annealing experiments for Fe irradiated with H or He ions were carried out to study interactions between gas atoms and vacancy clusters. The accelerating energy of H and He ions was 1.0 MeV and 3.3 MeV, respectively. The total dose was 1.0 x 10(21) H ions/m(2) (0.2dpa) and 9.6 x 10(19) He ions/m(2) (0.3 dpa), and the irradiation temperature was 300degreesC. Positron annihilation lifetime and coincidence Doppler broadening (CDB) measurements were carried out after irradiation and annealing for 1 hour up to the complete recovery temperature. Microvoids were detected after H or He ion irradiation. The characteristic difference was mainly shown in the recovery of vacancy type defects. The recovery of vacancy type defects introduced by H ion irradiation finished completely at 450degreesC, while that by He ion irradiation finished at 1000degreesC. It suggests that H-vacancy complexes were less stable than He-vacancy complexes. In addition, vacancy clusters formed by He ion irradiation grew after annealing at 600degreesC. This was caused by the emission of He atoms from small He-vacancy clusters and the coalescence between free vacancies and vacancy clusters, and by the migration and coalescence of He bubbles.