Influence of alloy composition and thermal history on carbide precipitation in γ-based TiAl alloys

被引：31
作者：
Wang, Li [1 ]
Lorenz, Uwe [1 ]
Muench, Mathias [2 ]
Stark, Andreas [1 ]
Pyczak, Florian [1 ,2 ]
机构：
[1] Helmholtz Zentrum Geesthacht, Inst Mat Res, Max Planck Str 1, D-21502 Geesthacht, Germany
[2] Brandenburg Tech Univ Cottbus Senftenberg, Konrad Wachsmann Allee 17, D-03046 Cottbus, Germany
来源：
INTERMETALLICS | 2017年 / 89卷
关键词：
A; Intermetallics; B. Alloy design; B. Phase stability; F. Diffraction/scattering (electron; neutron and X-ray); F. Electron microscopy Transmission; TITANIUM ALUMINIDE ALLOYS; MECHANICAL-PROPERTIES; CARBON ADDITION; AL-C; MICROSTRUCTURE; CREEP; PHASE; SOLUBILITY; NUCLEATION; MICROSCOPY;
D O I：
10.1016/j.intermet.2017.05.006
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：
Carbide precipitation in TiAI alloys with different alloying element additions and thermal history was investigated by transmission electron microscopy and high energy X-ray diffraction. The results reveal that Nb addition in TiAl alloys does not increase the carbon solubility in the gamma matrix significantly. With increasing carbon concentration in the alloys, a splitting of the P-type carbides takes place earlier in the course of ageing at 800 degrees C and the formation of H-type carbides is promoted. For a nearly single y phase alloy Ti-51A1-5Nb-0.5C, H-type carbides are the thermodynamically stable phase. However, with decreasing Al concentration, P-type carbides become thermodynamically stable at low carbon concentration (below 1%) in Ti-45A1 and Ti-45A1-5Nb alloys. It is feasible to achieve high thermodynamical stability of the P-type carbides in TiAl alloys through controlling alloying elements.
引用
收藏
页码：32 / 39
页数：8
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