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Title: 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

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [4] ;  [5] ;  [6] ;  [1]
  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
Publication Date:
Grant/Contract Number:
AC02-05CH11231; EE0005941; 51671154; 51405507; 2016YFB0700404; 2015CB057400; 20171907
Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 151; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Xi'an Jiaotong Univ. (China)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S); National Natural Science Foundation of China (NNSFC); National Key Research and Development Program of China; National Basic Research Program of China
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Laue X-ray microdiffraction; strain; oxidation; thermal constriction; FeCrAl alloy
OSTI Identifier:
1439245