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The reactive element effect of ceria particle dispersion on alumina growth: A model based on microstructural observations
Wang, X.; Peng, X.; Tan, X.; Wang, F.; Peng, X (reprint author), Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China.; Peng, X (reprint author), Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, Shenyang 110016, Peoples R China.
2016-07-13
发表期刊SCIENTIFIC REPORTS
ISSN2045-2322
卷号6
摘要The oxidation kinetics of alumina-forming metals can be affected by adding a small amount of a reactive (normally rare earth) element oxide (RExOy) and the segregation of the reactive element (RE) ions to the growing alumina grain boundaries (GBs) has been considered as a responsible reason. However, this interpretation remains a controversial issue as to how RE ions are produced by RExOy which is thermodynamically and chemically stable in metals. The question is answered by a model that is based on transmission electron microscopy (TEM) investigation of a CeO2-dispersed nickel aluminide oxidized in air at 1100 degrees C. The CeO2 dispersion is incorporated into the alumina scale by the inward growth of inner alpha-Al2O3, where it partially dissolves producing tetravalent Ce cations which then transform to trivalent cations by trapping electrons. The trivalent cations segregate to the a-Al2O3 GBs and diffuse outward along first the GBs and later the twin boundaries (TBs) in the outer gamma-Al2O3 layer, being precipitated as Ce2O3 particles near surface.
部门归属[wang, x. ; peng, x.] univ sci & technol china, sch mat sci & engn, hefei 230026, peoples r china ; [wang, x. ; peng, x. ; tan, x. ; wang, f.] chinese acad sci, inst met res, lab corros & protect, shenyang 110016, peoples r china
学科领域Science & Technology - Other Topics
资助者National Natural Science Foundation of China (NSFC) [51471178]
收录类别sci
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/75792
专题中国科学院金属研究所
通讯作者Peng, X (reprint author), Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China.; Peng, X (reprint author), Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, Shenyang 110016, Peoples R China.
推荐引用方式
GB/T 7714
Wang, X.,Peng, X.,Tan, X.,et al. The reactive element effect of ceria particle dispersion on alumina growth: A model based on microstructural observations[J]. SCIENTIFIC REPORTS,2016,6.
APA Wang, X.,Peng, X.,Tan, X.,Wang, F.,Peng, X ,&Peng, X .(2016).The reactive element effect of ceria particle dispersion on alumina growth: A model based on microstructural observations.SCIENTIFIC REPORTS,6.
MLA Wang, X.,et al."The reactive element effect of ceria particle dispersion on alumina growth: A model based on microstructural observations".SCIENTIFIC REPORTS 6(2016).
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