Core/shell structures of oxygen-rich nanofeatures in oxide-dispersion strengthened Fe-Cr alloys

被引：148

作者：

Marquis, Emmanuelle A. ^{[1
]}

机构：

[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 18期

基金：

英国工程与自然科学研究理事会;

关键词：

chromium alloys; creep; iron alloys; radiation effects; shells (structures);

D O I：

10.1063/1.3000965

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

With the significant improvement in high temperature creep properties and resistance to radiation damage by addition of nanoscale oxide features, oxide-dispersion strengthened (ODS) ferritic/martensitic alloys are potential candidates for structural applications in nuclear fusion reactors. The structure of the oxygen-rich nanofeatures was analyzed by atom-probe tomography in three ODS alloys: MA957, ODS Fe-12 wt %Cr, and ODS Eurofer-97. Although field evaporation and reconstruction of the precipitates suffer from artefacts, a core/shell structure is found even for very small precipitates. Precipitate cores are Y rich while shell regions are enriched in Ti, Cr, or V depending on alloy composition.

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