EVIDENCE FOR THE FORMATION OF SUBSTOICHIOMETRIC SPECIES DURING INTERNAL OXIDATION OF AG-MG ALLOYS

被引：19

作者：

CHARRIN, L

COMBE, A

CABANE, F

CABANE, J

机构：

[1] Laboratoire de Métallurgie-EDIFIS, Associé au CNRS, Faculté des Sciences et Techniques de Saint Jérôme, Marseille, Cedex 20, 13397

来源：

OXIDATION OF METALS | 1993年 / 40卷 / 5-6期

关键词：

INTERNAL OXIDATION; OXIDE PARTICLES; SILVER ALLOYS; X-RAYS; LATTICE EXPANSION;

D O I：

10.1007/BF00666388

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Lattice parameters of Ag-Mg (0.5 and 1 at.% ) were measured. A comparison between these results and data previously obtained by gravimetry shows that (a) a high dilatation is due mainly to excess oxygen by comparison with the amount necessary to form stoichiometric MgO oxide, and (b) the earliest stage of Mg oxidation occurs in a non-expanded layer beneath the expanded one, with the formation of substoichiometric species (O/Mg < 1). The formation of substoichiometric species is explained by taking account of strain fields close to O and Mg atoms in the silver lattice. Indeed, the strong deformation introduced by oxygen in interstitial position delays the addition of oxygen on the MgO* and Mg2O* initial species and favors the formation of substoichiometric species.

引用

页码：483 / 501

页数：19