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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 2    April 2007

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Internal oxidation thermodynamics and microstructures of Ag-Y alloy
WU Chun-ping(吴春萍)1, YI Dan-qing(易丹青)1, CHEN Jing-chao(陈敬超)2,
LI Jian(李 荐)1, LIU Hui-qun(刘会群)1,
WANG Bin(王 斌)1, FANG Xi-ya(方西亚)1

1. School of Materials Science and Engineering, Central South University,
Changsha 410083,China;
2. Key Laboratory of Advanced Materials of Yunan Province,
Kunming University of Science and Technology, Kunming 650093, China

Abstract:The thermodynamic data of pure Ag and Y were calculated. The phase constitution, composition of micro-region and microstructures of Ag-Y alloy after internal oxidation were investigated by X-ray diffractometry(XRD), energy dispersion spectrometry(EDS) and scanning electron microscopy(SEM). The results show that the internal oxidation behavior of Ag-Y alloy is feasible from the view of thermodynamics. The upper limit of oxygen partial pressure of Ag-Y alloy oxidation is a function of temperature. Two phases (Ag and Y2O3) appear in Ag-Y alloy after the internal oxidation. The surface of Ag-Y alloy is convex because of the volume expansion of oxide in the alloy and the composition of the convex part is Ag. In Ag-Y2O3 sintered bulk Y2O3 particles are distributed inhomogeneously and conglomerated seriously, but they are dispersed uniformly in the Ag matrix after severe plastic deformation.

 

Key words: Ag-Y alloy; internal oxidation; thermodynamics; microstructure

ISSN 1672-7029
CN 43-1423/U

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