High-temperature oxidation of two-phase nanocrystalline Ag-Cr alloys in 1 atm O-2

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	High-temperature oxidation of two-phase nanocrystalline Ag-Cr alloys in 1 atm O-2
	Y. Niu; J. X. Song; F. Gesmundo; G. Farne
	2001
发表期刊	Oxidation of Metals
ISSN	0030-770X
卷号	55 期号:3-4 页码:291-305
摘要	Two nanocystalline two-phase Ag-Cr alloys prepared bq: mechanical alloying and containing approximately 30 and 50 wt.% Cr were oxidized in I atm OZ at 700 and 800 degreesC. Under all conditions, a continuous layer of chromia formed at the surface of the alloys, in spite of the very low solubility of Cr in Ag. A laver of AgCrO2 also formed externally to the chromia layer. In the case of the Ag-30 Cr alloy, some Ag particles were also present on the scale, directly in contact with the gas phase. Moreover, Cr particles dissolved in the subsurface region of the alloy, while internal oxidation of Cr, was absent. Ag-Cr alloys prepared by powder metallurgy with coarse grain si-es were able to form an irregular thin chromia layer only at a Cr content of 69 wt.%, while an alloy containing 35 wt.% Cr corroded much more rapidly than the nanocrystalline Ag-30Cr alloy. This difference in the scaling behavior is attributed to the large reduction in the alloy grain size, which favors the dissolution of the Cr-rich particles in a Cr-depleted silver matrix and thus provides a faster supply of chromium from the alloy to the scale.
部门归属	inst corros & protect met, state key lab corros & protect, shenyang, peoples r china. univ genoa, dipartimento ingn chim, i-16129 genoa, italy.;niu, y (reprint author), inst corros & protect met, state key lab corros & protect, wencui rd 62, shenyang, peoples r china
关键词	Ag-cr Nanocrystalline Two-phase Alloys Oxidation 2-phase Binary-alloys Low-oxygen Pressures Possible Scaling Modes Low Oxidant Pressures 304 Stainless-steel Fe-cu Alloys Internal Oxidation Air Oxidation Grain-boundaries Resistance
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WOS记录号	WOS:000168357900008
引用统计	被引频次：13[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/321006/36761
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Niu,J. X. Song,F. Gesmundo,et al. High-temperature oxidation of two-phase nanocrystalline Ag-Cr alloys in 1 atm O-2[J]. Oxidation of Metals,2001,55(3-4):291-305.
APA	Y. Niu,J. X. Song,F. Gesmundo,&G. Farne.(2001).High-temperature oxidation of two-phase nanocrystalline Ag-Cr alloys in 1 atm O-2.Oxidation of Metals,55(3-4),291-305.
MLA	Y. Niu,et al."High-temperature oxidation of two-phase nanocrystalline Ag-Cr alloys in 1 atm O-2".Oxidation of Metals 55.3-4(2001):291-305.