A study of deformation and strain induced in bulk by the oxide layers formation on a Fe-Cr-Al alloy in high-temperature liquid Pb-Bi eutectic

Journal Article · Thu Mar 29 00:00:00 UTC 2018 · Acta Materialia

DOI: https://doi.org/10.1016/j.actamat.2018.03.041 · OSTI ID:1439245

Popovic, M. P. ^[1]; Chen, K. ^[2]; Shen, H. ^[3]; Stan, C. V. ^[4]; Olmsted, D. L. ^[5]; Tamura, N. ^[4]; Asta, M. ^[5]; Abad, M. D. ^[6]; Hosemann, P. ^[1]

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1. Univ. of California, Berkeley, CA (United States). Dept. of Nuclear Engineering
2. Xi'an Jiaotong Univ. (China). Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano). State Key Lab. for Mechanical Behavior of Materials
3. Xi'an Jiaotong Univ. (China). Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano). State Key Lab. for Mechanical Behavior of Materials; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
5. Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
6. Ramon Llull Univ., Barcelona (Spain). Chemical Inst. of Sarria. School of Engineering

At elevated temperatures, heavy liquid metals and their alloys are known to create a highly corrosive environment that causes irreversible degradation of most iron-based materials. In this paper, it has been found that an appropriate concentration of oxygen in the liquid alloy can significantly reduce this issue by creating a passivating oxide scale that controls diffusion, especially if Al is present in Fe-based materials (by Al-oxide formation). However, the increase of the temperature and of oxygen content in liquid phase leads to the increase of oxygen diffusion into bulk, and to promotion of the internal Al oxidation. This can cause a strain in bulk near the oxide layer, due either to mismatch between the thermal expansion coefficients of the oxides and bulk material, or to misfit of the crystal lattices (bulk vs. oxides). This work investigates the strain induced into proximal bulk of a Fe-Cr-Al alloy by oxide layers formation in liquid lead-bismuth eutectic utilizing synchrotron X-ray Laue microdiffraction. Finally, it is found that internal oxidation is the most likely cause for the strain in the metal rather than thermal expansion mismatch as a two-layer problem.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Xi'an Jiaotong Univ. (China)
• Sponsoring Organization: National Basic Research Program of China; National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Grant/Contract Number: AC02-05CH11231; EE0005941
• OSTI ID: 1439245
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Vol. 151; ISSN 1359-6454
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English