Microstructural evolution of platinum modified nickel aluminide bond coat during thermal cycling

被引：86

作者：

Chen, MW ^{[1
]}

Ott, R

Hufnagel, TC

Wright, PK

Hemker, KJ

机构：

[1] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA

[2] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA

[3] GE Aircraft Engines, Mat & Proc Engn Dept, Cincinnati, OH 45215 USA

来源：

SURFACE & COATINGS TECHNOLOGY | 2003年 / 163卷

基金：

美国国家科学基金会;

关键词：

thermal harrier coatings; bond coat; microstructure; martensitic transformation; X-ray diffraction; TEM; transformation strain and stress;

D O I：

10.1016/S0257-8972(02)00591-1

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Microstructural evolution induced by thermal cycling in a platinum modified diffusion aluminide bond coat was investigated with transmission electron microscopy and elevated temperature X-ray diffraction (XRD). Before thermal cycling, the structure of the as-received bond coat was confirmed to be an ordered B2 phase, but significant lattice strains were found which were associated with the formation of a modulated structure. Thermal cycling resulted in significant changes in the microstructure of the bond coat. The compositional development assisted by chemical diffusion during thermal cycling has been related to the transformation of the bond coat from its original B2 structure to a Ni-rich L1(0) martensite. The L1(0) martensite was found to be stable at temperatures below approximately 600 degreesC and the B2 parent phase stable at elevated temperatures. Quantitative XRD measurements indicated that the volume of the B2 phase is approximately 2% larger than that of the martensite, which produces a similar to0.7% linear transformation strain. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：25 / 30

页数：6

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