Effect of surface roughness on the development of protective Al2O3 on Fe-10Al (at.%) alloys containing 0-10 at.% Cr

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	Effect of surface roughness on the development of protective Al2O3 on Fe-10Al (at.%) alloys containing 0-10 at.% Cr; Effect of surface roughness on the development of protective Al2O3 on Fe-10Al (at.%) alloys containing 0-10 at.% Cr
	Z. G. Zhang; P. Y. Hou; F. Gesmundo; Y. Niu
	2006 ; 2006
发表期刊	Applied Surface Science ; Applied Surface Science
ISSN	0169-4332 ; 0169-4332
卷号	253 期号:2 页码:881-888
摘要	The effect of alloy surface roughness, achieved by different degrees of surface polishing, on the development of protective alumina layer on Fe-10 at.% Al alloys containing 0, 5, and 10 at.% Cr was investigated during oxidation at 1000 degrees C in 0.1 MPa oxygen. For alloys that are not strong Al2O3 formers (Fe-10Al and Fe-5Cr-10Al), the rougher surfaces increased Fe incorporation into the overall surface layer. On the Fe-10Al, more iron oxides were formed in a uniform layer of mixed aluminum- and iron-oxides since the layer was thicker. On the Fe-5Cr-10Al, more iron-rich nodules developed on an otherwise thin Al2O3 Surface layer. These nodules nucleated preferentially along surface scratch marks but not on alloy grain boundaries. For the strong Al2O3-forming Fe-10Cr-10Al alloy, protective alumina surface layers were observed regardless of the surface roughness. These results indicate that the formation of a protective Al2O3 layer on Fe-Cr-Al surfaces is not dictated by Al diffusion to the surface. More cold-worked surfaces caused an enhanced Fe diffusion, hence produced more Fe-rich oxides during the early stage of oxidation. (c) 2006 Elsevier B.V. All rights reserved.; The effect of alloy surface roughness, achieved by different degrees of surface polishing, on the development of protective alumina layer on Fe-10 at.% Al alloys containing 0, 5, and 10 at.% Cr was investigated during oxidation at 1000 degrees C in 0.1 MPa oxygen. For alloys that are not strong Al2O3 formers (Fe-10Al and Fe-5Cr-10Al), the rougher surfaces increased Fe incorporation into the overall surface layer. On the Fe-10Al, more iron oxides were formed in a uniform layer of mixed aluminum- and iron-oxides since the layer was thicker. On the Fe-5Cr-10Al, more iron-rich nodules developed on an otherwise thin Al2O3 Surface layer. These nodules nucleated preferentially along surface scratch marks but not on alloy grain boundaries. For the strong Al2O3-forming Fe-10Cr-10Al alloy, protective alumina surface layers were observed regardless of the surface roughness. These results indicate that the formation of a protective Al2O3 layer on Fe-Cr-Al surfaces is not dictated by Al diffusion to the surface. More cold-worked surfaces caused an enhanced Fe diffusion, hence produced more Fe-rich oxides during the early stage of oxidation. (c) 2006 Elsevier B.V. All rights reserved.
部门归属	chinese acad sci, inst met res, shenyang 110016, peoples r china. shenyang inst chem technol, dept appl chem, shenyang 110142, peoples r china. univ calif berkeley, lawrence berkeley lab, div sci mat, berkeley, ca 94720 usa. univ genoa, dichep, i-16129 genoa, italy.;zhang, zg (reprint author), chinese acad sci, inst met res, s campus,wencui rd 62, shenyang 110016, peoples r china;zhangzhigangneu@sohu.com ; chinese acad sci, inst met res, shenyang 110016, peoples r china. shenyang inst chem technol, dept appl chem, shenyang 110142, peoples r china. univ calif berkeley, lawrence berkeley lab, div sci mat, berkeley, ca 94720 usa. univ genoa, dichep, i-16129 genoa, italy.;zhang, zg (reprint author), chinese acad sci, inst met res, s campus,wencui rd 62, shenyang 110016, peoples r china;zhangzhigangneu@sohu.com
关键词	High Temperature Oxidation High Temperature Oxidation Alumina Alumina Surface Roughness Surface Roughness Nodules Nodules Third Third Element Effect Element Effect High-temperature Oxidation High-temperature Oxidation Iron-aluminum-alloys Iron-aluminum-alloys Al Alloys Al Alloys Fe-al Fe-al Chromium-alloys Chromium-alloys Grain-size Grain-size Scales Scales Resistance Resistance Growth Growth Oxygen Oxygen
URL	查看原文 ; 查看原文
WOS记录号	WOS:000242647800078 ; WOS:000242647800078
引用统计	被引频次：29[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34732
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. G. Zhang,P. Y. Hou,F. Gesmundo,et al. Effect of surface roughness on the development of protective Al2O3 on Fe-10Al (at.%) alloys containing 0-10 at.% Cr, Effect of surface roughness on the development of protective Al2O3 on Fe-10Al (at.%) alloys containing 0-10 at.% Cr[J]. Applied Surface Science, Applied Surface Science,2006, 2006,253, 253(2):881-888, 881-888.
APA	Z. G. Zhang,P. Y. Hou,F. Gesmundo,&Y. Niu.(2006).Effect of surface roughness on the development of protective Al2O3 on Fe-10Al (at.%) alloys containing 0-10 at.% Cr.Applied Surface Science,253(2),881-888.
MLA	Z. G. Zhang,et al."Effect of surface roughness on the development of protective Al2O3 on Fe-10Al (at.%) alloys containing 0-10 at.% Cr".Applied Surface Science 253.2(2006):881-888.