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Effect of Zr on the Oxidation p.op.rties of Fe3Al Intermetallic Comp.und

中国腐蚀与防护学报 2009年第4期29卷 286-292页

作者： K. p.ZYBYLSKI S. CHEVALIER p. juzon AGH University of Science and Technology Faculty of Materials Science and Ceramics al. Mickiewicza 30 30-059 Cracow Poland Instytut Carnot Bourgogne ICB CNRS UMR-5209-S.C. 9 Avenue Alain Savary BP 47870 21078 Dijon Cedet France

This review is concerned with the effect of the addition of zirconium as a third element on the heat-resisting p.op.rties of Fe_3Al intermetallic comp.unds and exp.ains their high-temp.rature oxidation *** Fe_3Al and Fe_3Al-0.05Zr sp.cimens were isothermally oxidized in the temp.rature range of 1173～1473 K in synthetic air for 100 *** formation of the alumina layer ap.roximately obeyed the p.rabolic rate law,with the excep.ion of short initial *** p.rabolic rate constant values for the Zr-dop.d Fe_3Al decreased at all tested ***_3Al revealed massive sp.llation,whereas Fe_3AlZr p.oduced a flat,adherent oxide *** microstructure investigations of the alumina scales grown thermally on the Fe_3Al-Zr alloy by means of SEM-EDS showed that they were 1.5～2μm thick and consisted of a small inner columnar layer and an equiaxed outer grain ***,very fine(50～150 nm) oxide p.rticles rich in Zr were found across the alumina *** addition of Zr significantly affected the oxidation behavior of Fe_3Al by imp.oving the adherence of theα-Al_2O_3 ***-SAD investigations of the alumina scales on samp.es p.ep.red using the FIB(Focused Ion Beam) method confirmed the p.esence of small tetragonal zirconia grains near the scale/gas and alloy/scale interfaces,most of which were formed along alumina grain boundaries(gbs).Zr gb-segregation was found using *** role of p.eferential formation of zirconium oxide along the alumina scale grain boundaries and the effect of Zr gb-segregation on oxidation and scale growth mechanisms were analyzed by means of two-stage oxidation exp.riments using ^(16)O_2/^(18)O_*** SIMS oxygen isotop. p.ofiles for the Fe_3Al-Zr alloy oxidized at 1373 K, after two-stage oxidation exp.riments,revealed that oxygen anion diffusion is p.edominant comp.red to that of aluminum cation diffusion.

关键词：金属混合物合金腐蚀氧化 Fe3Al

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