A diffusion analysis of transient subsurface γ′-Ni3Al formation during β-NiAl oxidation

被引：29

作者：

Zhang, Zhongfan ^{[1
]}

Gleeson, Brian ^{[1
]}

Jung, Keeyoung ^{[1
]}

Li, Long ^{[1
,2
]}

Yang, Judith C. ^{[2
,3
]}

机构：

[1] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA

[2] Univ Pittsburgh, Dept Chem & Petr Engn, Pittsburgh, PA 15261 USA

[3] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15261 USA

来源：

ACTA MATERIALIA | 2012年 / 60卷 / 13-14期

关键词：

Ni3Al phase formation; Diffusion; Oxidation; NiAl alloy; PROTECTIVE OXIDE-FILMS; MOST-STABLE OXIDE; INTRINSIC DIFFUSION; BINARY-ALLOYS; PHASE-TRANSFORMATIONS; APPROXIMATE TREATMENT; SELECTIVE OXIDATION; SINGLE; CORROSION; BEHAVIOR;

D O I：

10.1016/j.actamat.2012.06.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Cross-sectional transmission electron microscopy has demonstrated gamma'-Ni3Al formation at the alloy/oxide interface during beta-NiAl (1 1 0) oxidation under specific conditions. Diffusion analysis was applied to interpret this subsurface phase formation process. It showed that thermodynamically sufficient conditions for phase formation could be achieved with increasing temperature during the early oxidation stage. To stabilize continued gamma' growth, a kinetic requirement needed to be considered, which led to a thickness criterion. The predicted extent of subsurface gamma' phase formation showed good agreement with the experimental observations. (c) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：5273 / 5283

页数：11

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