Positron annihilation characterization of nanostructured ferritic alloys

被引：38

作者：

Alinger, M. J. ^{[1
]}

Glade, S. C. ^{[2
]}

Wirth, B. D. ^{[2
]}

Odette, G. R. ^{[3
]}

Toyama, T. ^{[4
]}

Nagai, Y. ^{[4
]}

Hasegawa, M. ^{[4
]}

机构：

[1] GE Global Res, Niskayuna, NY 12309 USA

[2] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA

[3] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

[4] Tohoku Univ, Inst Mat Res, Oarai Ctr, Oarai, Ibaraki 3111313, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 518卷 / 1-2期

关键词：

Positron; Nuclear materials; Ferritic steel; NFA; ODS; PAS; PRESSURE-VESSEL STEELS; MECHANICAL-PROPERTIES; STRUCTURAL-MATERIALS; MARTENSITIC STEELS; DEFECT STRUCTURE; FUSION-REACTORS; FE; LIFETIME; ODS; SPECTROSCOPY;

D O I：

10.1016/j.msea.2009.04.040

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nanostructured ferritic alloys (NFAs) were produced by mechanically alloying Fe-14Cr-3W-0.4Ti and 0.25Y(2)O(3) (wt%) powders followed by hot isostatic pressing consolidation at 850, 1000 and 1150 degrees C. Positron annihilation lifetime and orbital momentum spectroscopy measurements are in qualitative agreement with small angle neutron scattering, transmission electron microscopy and atom probe tomography observations, indicating that up to 50% of the annihilations occur at high densities of Y-Ti-O enriched nm-scale features (NFs). Some annihilations may also occur in small cavities. In Y-free control alloys, that do not contain NFs, positrons primarily annihilate in the Fe-Cr matrix and at features such as dislocations, while a small fraction annihilate in large cavities or Ar bubbles. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：150 / 157

页数：8

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[1] On the role of alloy composition and processing parameters in nanocluster formation and dispersion strengthening in nanostuctured ferritic alloys [J].