期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 658, 期 -, 页码 494-499出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.10.256
关键词
Zr alloy; Zr hydride; Crystallography; Twinning
资金
- SNZ
- National Natural Science Foundation [51571182, 51001091, 111174256, 91233101]
An important aspect of materials phenomena during the service of structural Zr alloys for nuclear cladding components is associated with hydrogen picking, which leads to the formation of delta-hydrides ZrHx (x = 1.55 or 1.66), the structural evolution of which is essential to the mechanical stability of the cladding components. In this work, we report the formation of delta-hydrides due to accidental hydrogen pickup, using high-resolution transmission electron microscopy (HRTEM). The results showed that the habit plane for relatively large delta-hydrides was (0001)(alpha), with the plate morphology. The morphology for regions with populous nano-sized hydrides is irregularly blocky, albeit being of the same orientation relationship between hydrides and matrix. Such remarkable morphological change is associated with multi-nucleation and twinning in the hydrides crystals in the nano-scale. (C) 2015 Elsevier B.V. All rights reserved.
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