Influence of oxygen on microstructure and phase transformation in high Nb containing TiAl alloys

被引：17
|
作者：
Zhong, Hong [1 ]
Yang, Yanlong [1 ]
Li, Jinshan [1 ]
Wang, Jun [1 ]
Zhang, Tiebang [1 ]
Li, Sheng [2 ]
Zhang, Ji [2 ]
机构：
[1] NW Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
[2] China Iron & Steel Res Inst, Beijing 100081, Peoples R China
来源：
MATERIALS LETTERS | 2012年 / 83卷
基金：
中国国家自然科学基金;
关键词：
Titanium aluminides; Solidification; Microstructure; Phase transformation; BEHAVIOR;
D O I：
10.1016/j.matlet.2012.06.013
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of oxygen on solidification microstructure of high Nb containing TiAl alloys with peritectic liquid composition was experimentally investigated. Alloys with oxygen content from 0.1 to 1.0 at.% were prepared by non-consumable vacuum arc remelting under protective atmosphere. Results indicate that increasing oxygen content in Ti-56Al-10Nb-xO alloys remarkably increases the amount of alpha(2) phase, and shifts the peritectic reaction alpha + L -> gamma to a higher Al content In Ti-54Al-8Nb-xO alloys, the mixed dendritic microstructure forms. The fine dendrites show peritectic halos and coarse dendrites consist of lamellae. The mixed dendritic microstructure has been interpreted by the stabilizing effect of oxygen on alpha phase and lamellar structure in high Nb containing TiAl alloys. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：198 / 201
页数：4
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