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TEM Investigation to Oxide Scale Formed on Single Crystal Alloy FeCr15Ni15 at High Temperature |
WEI Xinxin1,2,ZHANG Bo1(),MA Xiuliang1 |
1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China |
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Abstract The oxide scale formed on FeCr15Ni15 single crystal alloy at 600 ℃ for 20 h was characterized by means of transmission electron microscope. Results showed that the oxide scale of 4~6 μm in thickness was differentiated into two layers. The inner layer of the scale was spinel oxide rich in Fe and Cr, while the outer layer was spinel oxide rich in Fe and Ni. The region I of inner layer was anisotropy, of which oxides present epitaxial growth along a large amount of (111) plane of the matrix, i.e. [110]matrix//[110]ox, (111)matrix//(111)ox, however the region II and region III compose completely of oxides, while there exist a large number of surface defects and holes left by the kirkendall effect, which become the most porous area of the oxide scale, therefore, as a result, cracking and spalling off may certainly occur there. In the contrast, the outer layer of the oxide scale is dense one composed of polycrystalline spinel oxides.
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Received: 12 September 2019
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Fund: National Natural Science Foundation of China(51771212);Innovation Fund in IMR(2017-ZD05) |
Corresponding Authors:
Bo ZHANG
E-mail: bozhang@imr.ac.cn
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