Phase separation in PM 2000™ Fe-base ODS alloy:: Experimental study at the atomic level

被引：82

作者：

Capdevila, C. ^{[1
]}

Miller, M. K. ^{[2
]}

Russell, K. F. ^{[2
]}

Chao, J. ^{[1
]}

Gonzalez-Carrasco, J. L. ^{[1
]}

机构：

[1] CSIC, Ctr Nacl Invest Met CENIM, Mat Grp, Madrid 28040, Spain

[2] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 490卷 / 1-2期

关键词：

phase separation; oxide dispersion strengthened steel; PM 2000 (TM); solute parfitioning; atom probe tomography;

D O I：

10.1016/j.msea.2008.01.029

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The coarsening of the three-dimensional microstructure resulting from phase separation during ageing at 748 K of a Fe-based PM 2000" oxide dispersion strengthened (ODS) steel has been investigated by atom probe tomography and hardness measurements. Phase separation resulted in the formation of isolated particles of the chromium-enriched a' phase. The aluminum and titanium were found to preferential partition to the iron-rich a phase. The partitioning of aluminum is consistent with theoretical calculations. The change in the scale of the chromium-enriched a' phase was found to fit a power law with a time exponent of 0.32 in accordance with that predicted by the classical Lifshitz, Slyozov and Wagner (LSW) theory. The solute concentrations of the coexisting a and a' phases were estimated from concentration frequency distributions with the Langer-Bar-on-Miller (LBM) method and proximity histograms. The hardness was linearly related to the chromium content of the ot' phase. (c) 2008 Elsevier BX All rights reserved.

引用

页码：277 / 288

页数：12

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