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| INVESTIGATION OF MICROSTRUCTURE OF OXIDE LAYERS FORMED INITIALLY ON Zr-4 ALLOY |
| DU Chenxi1), PENG Jianchao2), LI Hui1), ZHOU Bangxin1) |
1) Institute of Materials, Shanghai University, Shanghai 200072
2) Laboratory for Microstructures, Shanghai University, Shanghai 200444 |
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Cite this article:
DU Chenxi PENG Jianchao LI Hui ZHOU Bangxin. INVESTIGATION OF MICROSTRUCTURE OF OXIDE LAYERS FORMED INITIALLY ON Zr-4 ALLOY. Acta Metall Sin, 2011, 47(7): 887-892.
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Abstract Zr--4 specimens with coarse grain of 0.2-0.8 mm were prepared to investigate the anisotropic growth of oxide layers formed initially on the grain surface with different orientations during corrosion tests in autoclave at 360 ℃/18.6 MPa in 0.01 mol/L LiOH aqueous after 5 h exposure. SEM, EBSD and HRTEM were adopt to measure the thickness of oxide layers, to determine the grain orientation of the matrix surface and to investigate the microstructure of oxide layers. The thicknesses of oxide layers formed on different grains varied in the range of 376-455 nm. The thickest oxide layers were detected on the grains with the orientations nearby basal plane (0001) and prismatic plane (0110). The oxide layers have monoclinic, cubic, tetragonal crystal structures. Besides the thickness difference of oxide layers, the crystal structure and misorientation of nano-grains in oxide layers formed on different grains were also significantly different, and the most complicated oxide layer was formed on the grain with orientation nearby (0001) plane. Such kind of microstructure has more crystal defects, and larger ability for promoting the diffusion of oxygen ions and the growth of oxide layer.
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Received: 29 March 2011
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| Fund: Supported by National Natural Science Foundation of China (No.50971084) and Shanghai Leading Academic Discipline Project (No.S30107}) |
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