High temperature oxidation of Ti-47%Al-1.7%W-3.7%Zr alloys

被引：15

作者：

Lee, DB ^{[1
]}

Woo, SW ^{[1
]}

机构：

[1] Sungkyunkwan Univ, Ctr Adv Plasma Surface Technol, Suwon 440746, South Korea

来源：

INTERMETALLICS | 2005年 / 13卷 / 02期

关键词：

titanium alummides; based on TiAl; oxidation; casting; aerospace constructional uses;

D O I：

10.1016/j.intermet.2004.07.043

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Alloys of Ti47Al-1.7W3.7Zr were oxidized between 900 and 1050 degreesC in air. These alloys displayed much better oxidation resistance than pure Ti-(47,51)Al alloys, but poorer oxidation resistance than Ti-(45-52)Al-2W-(0, 0.5)Si alloys. The oxide scales consisted primarily of an outer TiO2 layer, an intermediate Al2O3 layer and an inner (TiO2 + Al2O3) mixed layer. In these oxides, WO3 and ZrO2 coexisted, mainly in the inner (TiO2 + Al2O3) mixed layer. Additionally, some of the W and Zr existed as dissolved ions in the (TiO2, Al2O3) oxide scale. Tiny Ti-W-Al-O compounds and the nitrides, Ti2AlN and TiN, formed mainly around the scale/matrix interface. Below the scale, oxygen preferentially diffused along the W-enriched beta-Ti islands in the (Ti-enriched, Al-depleted) matrix area. The detailed scale characteristics and oxidation mechanism are described. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：169 / 177

页数：9

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