Crossover from disordered to core-shell structures of nano-oxide Y2O3 dispersed particles in Fe

被引：18

作者：

Higgins, M. P. ^{[1
]}

Lu, C. Y. ^{[1
,2
]}

Lu, Z. ^{[2
]}

Shao, L. ^{[3
]}

Wang, L. M. ^{[1
]}

Gao, F. ^{[1
]}

机构：

[1] Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA

[2] Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Liaoning, Peoples R China

[3] Texas A&M Univ, Dept Nucl Engn, College Stn, TX 77843 USA

来源：

APPLIED PHYSICS LETTERS | 2016年 / 109卷 / 03期

关键词：

FERRITIC STEEL; ODS PARTICLES; MICROSTRUCTURE; PRECIPITATION; MORPHOLOGY; TI;

D O I：

10.1063/1.4959776

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Molecular dynamic simulations of Y2O3 in bcc Fe and transmission electron microscopy (TEM) observations were used to understand the structure of Y2O3 nano-clusters in an oxide dispersion strengthened steel matrix. The study showed that Y2O3 nano-clusters below 2 nm were completely disordered. Y2O3 nano-clusters above 2 nm, however, form a core-shell structure, with a shell thickness of 0.5-0.7 nm that is independent of nano-cluster size. Y2O3 nano-clusters were surrounded by off-lattice Fe atoms, further increasing the stability of these nano-clusters. TEM was used to corroborate our simulation results and showed a crossover from a disordered nano-cluster to a core-shell structure. Published by AIP Publishing.

引用

页数：4

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