Limited Effect of Twin Boundaries on Radiation Damage

doi:10.1007/s40195-015-0363-0

金属学报英文版 ›› 2016, Vol. 29 ›› Issue (1): 72-78.DOI: 10.1007/s40195-015-0363-0

收稿日期:2016-01-04 修回日期:2016-01-04 出版日期:2016-01-04 发布日期:2016-01-20

Limited Effect of Twin Boundaries on Radiation Damage

Jin Gao, Zhi-Jun Liu, Fa-Rong Wan†

Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology, Beijing 100083, China

Received:2016-01-04 Revised:2016-01-04 Online:2016-01-04 Published:2016-01-20

摘要/Abstract

Abstract:

The different influences of the general grain boundary and the twin boundary on the cavity formation were investigated in copper irradiated by helium at room temperature. Large number of the cavities with sizes smaller than 5 nm formed after irradiation, which were almost homogenously distributed inside the grains. However, the distribution of the cavities varied near the general grain boundary and the twin boundary. Cavities-depleted zone was readily observed near the general grain boundaries, which was rarely observed near the twin boundaries. Meanwhile, decoration of dense cavities within the grain boundary plane was observed. The results suggested the limited influence of the twin boundaries as the point defect sinks compared with the general grain boundaries.

Key words: Transmission electron microscopy, Cavities, Cavities-depleted zone, General grain boundary, Twin boundary

. [J]. 金属学报英文版, 2016, 29(1): 72-78.

Jin Gao, Zhi-Jun Liu, Fa-Rong Wan†. Limited Effect of Twin Boundaries on Radiation Damage[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(1): 72-78.

图/表 7

Fig.1 SRIM calculation of irradiation damage and He concentration profile in Cu under 30 keV helium irradiation

Fig.2 Cavities formed after helium ion irradiation at room temperature

Fig.3 Cavities formed in the interior of the grain after 30 keV He ions irradiation at room temperature: a multifaceted shape with size smaller than 5 nm (measured by the distance shown in the micrograph); b hexagonal cavity with its facets aligned with the matrix. The FFT was superimposed in the inset in b

Fig.4 Cavities near general grain boundary a, twin boundary b in Cu after helium irradiation

Fig.5 a Cavity formation near the grain boundary triple-junction; b two general grain boundaries marked as GB1 and GB2, with SAED patterns from the three grains superimposed in the micrograph; c zoom-in image of micrograph b; d cavity distribution along GB1 after being tilted a small angle (α = 8°, β = 7°)

Fig.6 a Cavities near the twin boundary with its corresponding SAED pattern; b high-magnification micrograph of the cavities near the twin boundary

Fig.7 Statistical data of the cavities number adjacent to two types of the boundaries

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Limited Effect of Twin Boundaries on Radiation Damage

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