Microstructure of diffusion aluminide coatings on Ti-base alloy IMI-834 and their cyclic oxidation behaviour at 650°C

被引：49

作者：

Das, DK ^{[1
]}

Trivedi, SP ^{[1
]}

机构：

[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 367卷 / 1-2期

关键词：

oxidation; IMI-834; Ti alloy; platinum-aluminide coating; aluminide coating;

D O I：

10.1016/j.msea.2003.10.196

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 [材料科学与工程]; 080502 [材料学];

摘要：

The present study describes the microstructural details of plain pack aluminide and Pt-aluminide coatings on Ti-base alloy IMI-834 and their cyclic oxidation performance at 650degreesC in air. While the plain aluminide coating consists of a single layer of Al3Ti phase, the Pt-aluminide coating is constituted of two layers, with the outer layer consisting of PtAl2 and Al3Ti phases and the inner layer of Al3Ti phase. These two coatings display excellent cyclic oxidation resistance on IMI-834 alloy although the Pt-aluminide coating is found to be somewhat superior to its plain aluminide counterpart. Virtually no coating degradation occurs even after 500 h of oxidation exposure at 650degreesC. In this study, a layer of pure Pt deposited by electroplating is also found to offer limited protection against oxidation to the above alloy. TiO2 is found as the primary oxide phase in the oxidation of bare IMI-834 alloy. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：225 / 233

页数：9

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