期刊
INTERMETALLICS
卷 46, 期 -, 页码 173-184出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2013.11.011
关键词
Titanium aluminides, based on TiAl; Alloy design; Phase diagrams; Phase identification; Texture; Microstructure
资金
- German BMBF [O3X3530A]
- European Community [226716]
Improving mechanical properties of advanced intermetallic multi-phase gamma-TiAl based alloys, such as the Ti-43.5Al-4Nb-1Mo-0.1B alloy (in at.%), termed TNM alloy, is limited by compositional and microstructural adaptations. A common possibility to further improve strength and creep behavior of such beta-solidifying TiAl alloys is e.g. alloying with beta-stabilizing substitutional solid solution hardening elements Nb, Mo, Ta, W as well as the addition of interstitial hardening elements C and N which are also carbide and nitride forming elements. Carbon is known to be a strong alpha-stabilizer and, therefore, alloying with C is accompanied by a change of phase evolution. The preservation of the solidification pathway via the beta-phase, which is needed to obtain grain refinement, minimum segregation and an almost texture-free solidification microstructure, in combination with an enhanced content of C, requires a certain amount of beta-stabilizing elements, e.g. Mo. In the present study, the solidification pathway, C-solubility and phase evolution of C-containing TNM variants are investigated. Finally, the creep behavior of a refined TNM alloy with 1.5 at.% Mo and 0.5 at.% C is compared with that exhibiting a nominal Ti-43.5Al-4Nb-1Mo-0.1B alloy composition. (C) 2013 Elsevier Ltd. All rights reserved.
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