Phase transformations during creep of a multiphase TiAl-based alloy with a modulated microstructure

被引：45
作者：
Appel, F. [1 ]
Paul, J. D. H. [1 ]
Oehring, M. [1 ]
机构：
[1] GKSS Forschungszentrum Geesthacht GmbH, Inst Mat Res, D-21502 Geesthacht, Germany
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 510-11卷
关键词：
Titanium aluminides; Modulated microstructure; Creep; High-resolution electron microscopy; GAMMA-TITANIUM ALUMINIDES; BETA-PHASE; BEHAVIOR; DISLOCATIONS; DEFORMATION; SIZE; BCC;
D O I：
10.1016/j.msea.2008.08.047
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The creep behavior of a novel type of TiAl alloy with a composite-like microstructure has been investigated. The constitution and microstructure of the alloy result from decomposition reactions of the high-temperature beta/B2 phase. The characteristic constituents are structurally modulated laths that are comprised of several stable and metastable phases. Tensile creep tests have been correlated with characterization by high-resolution transmission electron microscopy. The creep behavior of the material is mainly limited by the early onset of tertiary creep at higher stresses and temperatures. The processes associated with this behavior are several phase transformations towards thermodynamic equilibrium, dynamic recrystallization and the relaxation of constraint stresses that exist between misfitting phases. (C) 2008 Elsevier B.V. All rights reserved.
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收藏
页码：342 / 349
页数：8
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