Improvement in mechanical and oxidation properties of TiAl alloys with Sb additions

被引：33

作者：

Huang, BY ^{[1
]}

He, YH ^{[1
]}

Wang, JN ^{[1
]}

机构：

[1] Cent S Univ Technol, Natl Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China

来源：

INTERMETALLICS | 1999年 / 7卷 / 08期

基金：

中国国家自然科学基金;

关键词：

titanium aluminides; based on TiAl;

D O I：

10.1016/S0966-9795(98)00136-8

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：

The objective of this study is to improve the mechanical properties and oxidation resistance by control of both alloy addition and microstructure in two-phase TiAl alloys based on Ti-48Al (at%). It is found that with the addition of up to 0.15Sb, the room temperature bending deflection and fracture strength (sigma(b)) can be enhanced significantly. For example, sigma(b) reaches as high as 1345 MPa in the alloy of Ti-48Al-0.15Sb. These improved properties are attributed mainly to the refinements of the colony grain size and the interlamellar spacing with the addition of Sb. Additionally, the high-temperature oxidation resistance can also be substantially increased in the presence of 0.15Sb, being higher than those for Ti-48Al and Ti-48Al-2Cr-2Nb. The cause for this increase is suggested to be the formation of a protective layer of Al2O3 stabilized by Sb. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：881 / 888

页数：8

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