Micro- and Nanostructure Evolution in Intermetallic Titanium Aluminides
After almost three decades of intensive fundamental research and development activities intermetallic titanium aluminides based on the γ-TiAl phase have found applications in automotive and aircraft engine industry. The advantages of this class of innovative high-temperature materials are their low density and their good strength and creep properties up to 750℃. Advanced TiAl alloys are complex multiphase alloys which can be processed by ingot or powder metallurgy as well as precision casting methods. Each process leads to specific microstructures which can be altered and optimized by thermo-mechanical processing and/or subsequent heat treatments. The background of these heat treatments is at least twofold,i. e. concurrent increase of ductility at room temperature and creep strength at elevated temperature. In order to achieve this goal the knowledge of the occurring phase transformation sequences and their effect on the evolving microstructure is essential. Therefore. thermodynamic calculations were conducted to predict the phase diagram of engineering TiAl alloys. To account for the influence of deformation and kinetic aspects, sophisticated ex-and in-situ methods have been employed to investigate the evolution of the microand nanostructure during hot-working and subsequent heat treatments.
Titanium aluminides (TiAl) highrtemperature materials microstructure nanostructure alloy development heat treatments ex-and in-situ characterization mechanical properties
Helmut Clemens Svea Mayer
Department of Physical Metallurgy and Materials Testing,Montanuniversitdt Leoben,A-8700 Leoben,Austria
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
395-403
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）