In Situ Characterization Techniques Based on Synchrotron Radiation and Neutrons Applied for the Development of an Engineering Intermetallic Titanium Aluminide Alloy

Metals

Petra Erdely¹  Thomas Schmoelzer³  Emanuel Schwaighofer³  Helmut Clemens³  Peter Staron⁴  Andreas Stark⁴  Klaus-Dieter Liss²  Svea Mayer³ 

[1] Recipient of a DOC Fellowship of the Austrian Academy of Sciences at the Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Roseggerstraße 12, 8700 Leoben, AustriaThe Bragg Institute, Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, NSW 2234, Australia;Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Roseggerstraße 12, 8700 Leoben, Austria;Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max Planck-Straße 1, 21502 Geesthacht, Germany;

关键词: titanium aluminides based on γ-TiAl;    high-energy X-ray diffraction;    phase transformations;    neutron diffraction;    order/disorder transformations;    small-angle scattering;    thermo-mechanical processing;    heat treatments;    microstructure evolution;   

DOI  :  10.3390/met6010010

来源: mdpi

【 摘 要 】

Challenging issues concerning energy efficiency and environmental politics require novel approaches to materials design. A recent example with regard to structural materials is the emergence of lightweight intermetallic TiAl alloys. Their excellent high-temperature mechanical properties, low density and high stiffness constitute a profile perfectly suitable for their application as advanced aero-engine turbine blades or as turbocharger turbine wheels in next-generation automotive engines. As the properties of TiAl alloys during processing as well as during service are dependent on the phases occurring, detailed knowledge of their volume fractions and distribution within the microstructure is of paramount importance. Furthermore, the behavior of the individual phases during hot deformation and subsequent heat treatments is of interest to define reliable and cost-effective industrial production processes. In situ high-energy X-ray diffraction methods allow tracing the evolution of phase fractions over a large temperature range. Neutron diffraction unveils information on order-disorder transformations in TiAl alloys. Small-angle scattering experiments offer insights into the materials’ precipitation behavior. This review attempts to shine a light on selected in situ diffraction and scattering techniques and the ways in which they promoted the development of an advanced engineering TiAl alloy.

【 授权许可】

CC BY   
© 2016 by the authors; licensee MDPI, Basel, Switzerland.