ALUMINUM DEPLETION PROFILES IN OXIDIZED NIAL SINGLE-CRYSTALS

被引：20

作者：

BOBETH, M ^{[1
]}

BISCHOFF, E ^{[1
]}

SCHUMANN, E ^{[1
]}

ROCKSTROH, M ^{[1
]}

RUHLE, M ^{[1
]}

机构：

[1] MAX PLANCK INST MET RES,INST WERKSTOFFWISSENSCH,STUTTGART,GERMANY

来源：

CORROSION SCIENCE | 1995年 / 37卷 / 04期

关键词：

D O I：

10.1016/0010-938X(94)00164-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Selective oxidation of NiAl leads to a depletion of aluminium in the metal near the oxide-metal interface. Depletion profiles after 50-500 h oxidation in air at 1223 K were measured by electron probe micro-analysis. The concentration-dependent interdiffusion coefficient was estimated from the profiles by means of a modified Boltzmann-Matano analysis. The interdiffusivity as a function of concentration shows a broad minimum at about 49 at% Al, which is smaller than data reported for polycrystalline NiAl. The variation of the interfacial concentration in the course of oxidation correlates with the varying scale growth rate with a maximum at 200 h, which is presumably related to the transformation of the metastable alumina phases to alpha-Al2O3.

引用

页码：657 / 670

页数：14

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