Thermo-mechanical processing in a synchrotron beam

Liss, Klaus-Dieter; Yan, Kun

doi:10.1016/j.msea.2010.06.017

Cited by 84 publications

(76 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A small number of refl ecting crystallites results in a low number of spots on the rings, and their distribution has been traced by the previously mentioned materials oscilloscope, for instance in plastic-deformation processes at high temperatures ( Figure 5 ). 31 The spots are not intrinsically sharp, but are convolved with the beam size. Moreover, they map features of the refl ecting grain, which may consist of subgrains with slightly different orientations and stress states.…”

Section: Principles Of Two-dimensional X-ray Diff Ractionmentioning

confidence: 99%

Frontiers of synchrotron research in materials science

Liss

Chen

2016

MRS Bull.

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Principles Of Two-dimensional X-ray Diff Ractionmentioning

confidence: 99%

Frontiers of synchrotron research in materials science

Liss

Chen

2016

MRS Bull.

Self Cite

View full text Add to dashboard Cite

show abstract

“…After 10% deformation (Figure 4b,e) the spots have azimuthally broadened (i.e., along the ring) and thus the rings have become continuous. This can be attributed to the increase of crystal mosaicity and generation of small angle grain boundaries at the beginning of plastic deformation [19,20]. Additionally the grains also start to rotate due to dislocation motion.…”

Section: Texture Formationmentioning

confidence: 99%

“…After 30% deformation, see Figure 4c,f, the intensity accumulation at preferred orientations is clearly visible which indicates the formation of the deformation texture. A simple and effective way to illustrate the crystallographic evolution during deformation is through the use of azimuth angle vs. time plots (AT plots) as introduced by Liss et al [20,29]. Such diagrams are constructed from a specific unrolled ring that is repeatedly plotted from the sequence of diffraction ring images that are collected over increasing time.…”

Section: Texture Formationmentioning

confidence: 99%

See 1 more Smart Citation

In Situ High-Energy X-ray Diffraction during Hot-Forming of a Multiphase TiAl Alloy

Stark

Rackel

Tankoua

et al. 2015

Metals

View full text Add to dashboard Cite

Intermetallic γ-TiAl based alloys exhibit excellent high-temperature strength combined with low density. This makes them ideal candidates for replacing the twice as dense Ni base super-alloys, currently used in the medium temperature range (~700 °C ) of industrial and aviation gas turbines. An important step towards the serial production of TiAl parts is the development of suitable hot-forming processes. Thermo-mechanical treatments often result in mechanical anisotropy due to the formation of crystallographic textures. However, with conventional texture analysis techniques, their formation can only be studied after processing. In this study, in situ high-energy X-ray diffraction measurements with synchrotron radiation were performed during hot-forming. Thus, it was possible to record the evolution of the phase constitution as well as the formation of crystallographic texture of different phases directly during processing. Several process temperatures (1100 °C to 1300 °C ) and deformation rates were investigated. Based on these experiments, a process window can be recommended which results in the formation of an optimal reduced texture. OPEN ACCESSMetals 2015, 5 2253

show abstract

“…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%

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

Erdely

Schmoelzer

Schwaighofer

et al. 2016

Metals

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Thermo-mechanical processing in a synchrotron beam

Cited by 84 publications

References 26 publications

Frontiers of synchrotron research in materials science

Frontiers of synchrotron research in materials science

In Situ High-Energy X-ray Diffraction during Hot-Forming of a Multiphase TiAl Alloy

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

Contact Info

Product

Resources

About