High-temperature synchrotron X-ray diffraction study of phases in a gamma TiAl alloy

Новоселова, Т. В.; Malinov, Savko; Sha, Wei; Zhecheva, A.

doi:10.1016/j.msea.2003.12.015

Cited by 93 publications

(51 citation statements)

References 24 publications

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“…For in situ investigations of the phase transformation behavior of titanium aluminides, high-energy X-ray diffraction (HEXRD) has evolved into a powerful and versatile tool [48,50,51,[63][64][65][66]. At synchrotron radiation sources, a white X-ray beam is produced by the deflection of charged particles, either electrons or positrons, by means of a bending magnet or an insertion device, i.e., a wiggler or an undulator, as shown in Figure 4 [67].…”

Section: Hexrd: State-of-the-art Instrumental Setupmentioning

confidence: 99%

“…%) alloy and allowed the investigation of the α + γ phase field region. Novoselova et al [48] applied synchrotron X-ray diffraction to a Ti-46Al-1.9Cr-3Nb (at. %) alloy using a two-circle high-resolution powder diffractometer and an X-ray energy of approximately 9.55 keV.…”

Section: Studies Of Phase Evolutions In Tnm Alloysmentioning

confidence: 99%

“…For this reason, the α Ñ α 2 /γ transformation has been the subject of thorough investigation, both from technological and scientific points of view [4,48,52,109,[117][118][119]. In TiAl alloys, the γ phase dissolves upon heating at T γ,solv .…”

Section: Microstructural Evolution: the Formation Of Lamellar α 2 /γ mentioning

confidence: 99%

“…Thirdly, SEM and X-ray diffraction using laboratory X-ray sources usually suffer from the restriction to the surface or to near-surface areas of the specimens. These areas might in some cases not yield sufficient grain statistics or, following extended heat treatments, be affected by the formation of an α case, an Al-depleted near-surface region of several µm in thickness [48][49][50]. Transmission electron microscopy (TEM) is also restricted to small sample volumes.…”

mentioning

confidence: 99%

“…Diffraction and scattering techniques using high-energy X-rays and neutrons have been shown to overcome most of the problems mentioned above [48,49,51,52]. Having been used as a tool for material characterization since the early beginnings of research activities on TiAl alloys [46,[53][54][55][56][57][58][59], they have successfully promoted the development of the alloy in various aspects ( Figure 2).…”

mentioning

confidence: 99%

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

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Abstract: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.

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