EVOLUTION OF THE STRUCTURE OF PRECIPITATES DURING INTERNAL OXIDATION OF AG-0.4 AT PERCENT MG ALLOY

被引：17

作者：

SEMEGA, BM ^{[1
]}

CHARRIN, L ^{[1
]}

COMBE, A ^{[1
]}

ARIDE, J ^{[1
]}

机构：

[1] FAC SCI & TECH ST JEROME,MET LAB,CNRS,URA 443,F-13397 MARSEILLE 13,FRANCE

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1992年 / 66卷 / 06期

关键词：

D O I：

10.1080/01418619208248010

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Internal oxides, formed at low temperatures (T less-than-or-equal-to 550-degrees-C) under an oxygen pressure of 1 atm, in dilute Ag-0.4 at.% Mg alloys have been studied by gravimetric measurements. It has been established that the oxygen fixation process involves three steps: firstly, substoichiometric species are initially formed; secondly, these elementary species evolve towards irregular clusters including an important excess of oxygen; thirdly, a part of this excess oxygen is released and clusters evolve towards a more compact structure. The largest oxygen excess is found in stable clusters formed at low temperature. The size of the oxide particles increases with increasing distance from the specimen surface and reaches a maximum value of about 1 nm. The fixation of oxygen follows a parabolic law during most of the coalescence process. The observed deviation from Wagner's law is attributed to the high value of the oxygen-to-magnesium ratio.

引用

页码：1139 / 1148

页数：10

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