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Journal Articles

Hydrostatic compression behavior and high-pressure stabilized $$beta$$-phase in $$gamma$$-based titanium aluminide intermetallics

Liss, K.-D.*; Funakoshi, Kenichi*; Dippenaar, R. J.*; Higo, Yuji*; Shiro, Ayumi*; Reid, M.*; Suzuki, Hiroshi; Shobu, Takahisa; Akita, Koichi

Metals, 6(7), p.165_1 - 165_22, 2016/07

 Times Cited Count:16 Percentile:72.33(Materials Science, Multidisciplinary)

Titanium aluminides find application in modern light-weight, high-temperature turbines, such as aircraft engines, but suffer from poor plasticity during manufacturing and processing. Huge forging presses enable materials processing in the 10 GPa range and hence, it is necessary to investigate the phase-diagrams of candidate materials under these extreme conditions. Here we report on an in-situ synchrotron X-ray diffraction study in a large-volume-press of a modern ($$alpha_{2}$$ + $$gamma$$) two-phase material, Ti-45Al-7.5Nb-0.25C, under pressures up to 9.6 GPa and temperatures up to 1686 K. At room temperature, the volume response to pressure is accommodated by the transformation $$gamma$$ $$rightarrow$$ $$alpha_{2}$$ rather than volumetric strain, expressed by apparently high bulk moduli of both constituent phases. Crystallographic aspects, specifically lattice strain and atomic order are discussed in detail. It is interesting to note that this transformation takes place despite an increase in atomic volume, which is due to the high ordering energy of $$gamma$$. Upon heating under high pressure, both the eutectoid and $$gamma$$-solvus transition temperatures are elevated, and a third, cubic $$beta$$-phase is stabilized above 1350 K. Earlier research has shown that this $$beta$$-phase is very ductile during plastic deformation, essential in near-conventional forging processes. Here, we were able to identify an ideal processing window for near-conventional forging, while the presence of the detrimental $$beta$$-phase is not present under operating conditions. Novel processing routes can be defined from these findings.

Journal Articles

The Recoil transfer chamber; An Interface to connect the physical preseparator TASCA with chemistry and counting setups

Even, J.*; Ballof, J.*; Br$"u$chle, W.*; Buda, R. A.*; D$"u$llmann, Ch. E.*; Eberhardt, K.*; Gorshkov, A.*; Gromm, E.*; Hild, D.*; J$"a$ger, E.*; et al.

Nuclear Instruments and Methods in Physics Research A, 638(1), p.157 - 164, 2011/03

 Times Cited Count:22 Percentile:86.19(Instruments & Instrumentation)

Journal Articles

Trends in stimulated Brillouin scattering and optical phase conjugation

Ostermeyer, M.*; Kong, H.-J.*; Kovalev, V. I.*; Harrison, R. G.*; Fotiadi, A. A.*; M$'e$gret, P.*; Kalal, M.*; Slezak, O.*; Yoon, J. W.*; Shin, J. S.*; et al.

Laser and Particle Beams, 26(3), p.297 - 362, 2008/09

 Times Cited Count:39 Percentile:56.17(Physics, Applied)

Journal Articles

Gas production and activation calculation in MEGAPIE

Thiolliere, N.*; David, J.-C.*; Eid, M.*; Konobeyev, A. Y.*; Eikenberg, J.*; Fischer, U.*; Gr$"o$schel, F.*; Guertin, A.*; Latg$'e$, C.*; Lemaire, S.*; et al.

Proceedings of International Conference on the Physics of Reactors, Nuclear Power; A Sustainable Resource (PHYSOR 2008) (CD-ROM), 8 Pages, 2008/09

Gas measurements by $$gamma$$ spectroscopy in the MEGAwatt PIlot Experiment (MEGAPIE) project has led to the determination of main radioactive isotopes released by the LBE. Comparison with calculations performed with several validated codes supplies important volatile elements release fraction estimation in a spallation target. In addition, calculations with MCNPX2.5.0, FLUKA and SNT codes coupled with evolution programs have been performed in order to study the activation of the target and structural materials. The induced database is relevant for safety and radioprotection during operation, for the post-irradiation experiments and for target dismantlement.

Oral presentation

High-temperature defect kinetics in titanium and zirconium alloys revealed ${it in-situ}$ by the dynamic extinction of neutron radiation

Liss, K. D.; Kabra, S.*; Thoennessen, L.*; Harjo, S.; Reid, M.*; Yan, K.*; Harrison, R.*; Dippenaar, R. J.*

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