The high temperature oxidation of a two-phase Ag-Y alloy under 1 and 10(-20) atm O-2

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	The high temperature oxidation of a two-phase Ag-Y alloy under 1 and 10(-20) atm O-2
	Y. Niu; F. Gesmundo; M. Al-Omary; J. Song
	2001
发表期刊	Journal of Alloys and Compounds
ISSN	0925-8388
卷号	317 页码:573-577
摘要	A silver-based alloy containing about 8 wt% Y (Ag-8Y) has been oxidized under 1 atm and 10(-20) atm O-2 at 700 degreesC. The alloy contains a mixture of a solid solution of Y in Ag (alpha phase) with an eutectic mixture of the alpha phase with the intermetallic compound Ag51Y14 (beta phase). The oxidation rate in 1 atm O-2 is very fast and follows the parabolic rate law to a good approximation. Oxidation under low P(O-2) is much slower and quite- irregular with large deviations from an average parabolic behavior. Under 1 atm O-2 the alloy undergoes only an internal oxidation of Y without any significant outward Y diffusion. as a result of a fast oxygen penetration. Under low P(O-2) the alloy forms an almost continuous Y2O3 layer containing Ag particles, plus a region of internal oxidation of Y much thinner than in 1 atm O-2. In bath cases the alloy forms also an external layer of pure Ag metal, more continuous for the oxidation under 1 atm O-2. The Y2O3 particles within the alloy change shape with depth, being small and globular close to the alloy surface but larger and acicular, elongated nearly perpendicularly to the alloy surface, ai larger depths. For samples oxidized under 10(-20) atm O-2 the volume fraction of internal oxide increases with depth in the alloy, tending to form an almost continuous oxide layer close to the front of internal oxidation, except over regions very rich in Ag. (C) 2001 Elsevier Science B.V. All rights reserved.
部门归属	univ genoa, dipartimento ingn chim, i-16129 genoa, italy. acad sinica, inst met res, state key lab corros & protect, shenyang 110015, peoples r china. univ sharjah, dept basic sci, sharjah, u arab emirates.;gesmundo, f (reprint author), univ genoa, dipartimento ingn chim, pad d, i-16129 genoa, italy
关键词	y Ag Two-phase Alloys Oxidation Low-oxygen Pressures 2-phase Binary-alloys Cu-cr Alloys Possible Scaling Modes Low Oxidant Pressures Internal Oxidation Air Oxidation 600-800-degrees-c 700-900-degrees-c
URL	查看原文
WOS记录号	WOS:000168157200110
引用统计	被引频次：18[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/321006/36760
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Niu,F. Gesmundo,M. Al-Omary,et al. The high temperature oxidation of a two-phase Ag-Y alloy under 1 and 10(-20) atm O-2[J]. Journal of Alloys and Compounds,2001,317:573-577.
APA	Y. Niu,F. Gesmundo,M. Al-Omary,&J. Song.(2001).The high temperature oxidation of a two-phase Ag-Y alloy under 1 and 10(-20) atm O-2.Journal of Alloys and Compounds,317,573-577.
MLA	Y. Niu,et al."The high temperature oxidation of a two-phase Ag-Y alloy under 1 and 10(-20) atm O-2".Journal of Alloys and Compounds 317(2001):573-577.