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2019-09-16
11:52
OpenAccess [PUBDB-2019-03333] Journal Article
et al
High-accuracy bulk electronic bandmapping with eliminated diffraction effects using hard X-ray photoelectron momentum microscopy
A key benefit of angle-resolved photoelectron spectroscopy (ARPES) in the X-ray range is thesignificant increase of the information depth, thanks to the large inelastic mean-free-path ofthe escaping photoelectrons. In practice hard X-ray ARPES (HARPES) faces severe challengesby low cross sections, large photon momentum transfer, and in particular strong phononscattering and photoelectron diffraction effects. [...]
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2019-09-16
11:41
[PUBDB-2019-03330] Journal Article
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Origin of Ferroelectric Phase in Undoped HfO$_{2}$ Films Deposited by Sputtering
Thin film metal–insulator–metal capacitors with undoped HfO$_2$ as the insulator are fabricated by sputtering from ceramic targets and subsequently annealed. The influence of film thickness and annealing temperature is characterized by electrical and structural methods. [...]
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2019-09-13
09:02
[PUBDB-2019-03307] Journal Article
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A simple correction for the parallax effect in X-ray pair distribution function measurements
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2019-09-12
14:07
Embargoed OpenAccess [PUBDB-2019-03297] Journal Article
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Follow-up structural evolution of Ni/Ti reactive nano and microlayers during diffusion bonding of NiTi to Ti6Al4V in a synchrotron beamline
Reaction-Assisted Diffusion Bonding (RADB) of NiTi to Ti6Al4V using either magnetron sputtered Ni/Ti nanomultilayersor Ni/Ti commercial microfoils as filler material was studied. The joining process takes advantage ofthe exothermal reactive character of the Ni-Ti system to provide extra energy during the bonding process.Therefore, sound joints could be achieved at lower thermal conditions. [...]
Published on 2019-08-08. Available in OpenAccess from 2020-08-08.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
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2019-09-12
14:01
OpenAccess [PUBDB-2019-03296] Journal Article
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Evidence for pressure-induced polarization rotation, octahedral tilting, and reentrant ferroelectric phase in tetragonal $\mathrm{(Pb_{0.5}Bi_{0.5})(Ti_{0.5}Fe_{0.5})O_{3}}$
Pressure-induced phase transition in the technologically important tetragonal phase of PbTiO$_3$ has been quite controversial with two entirely different propositions: (1) morphotropic phase boundary-like structural transition with concomitant rotation of the ferroelectric polarization vector and (2) antiferrodistortive (AFD) phase transition followed by emergence of a reentrant ferroelectric phase. We have attempted to address these controversies by enhancing the AFD instability of PbTiO$_3$ through 50% BiFeO$_3$ substitution in a tetragonal composition of the (1−x)PbTiO$_{3−x}$BiFeO$_3$ solid solution system [...]
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2019-09-11
17:30
Embargoed OpenAccess [PUBDB-2019-03293] Journal Article
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The origin of discontinuous yielding in Mg alloys under slip-dominated condition studied by in-situ synchrotron diffraction and elastic-viscoplastic self-consistent modeling
A discontinuous yielding was observed in the as-extruded Mg-7Gd-2Y-1Zn-0.6Zr (wt. %) alloy under uniaxial tension along the extrusion direction, which was eliminated by the peak-aging treatment. [...]
Published on 2019-03-20. Available in OpenAccess from 2020-03-20.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
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2019-09-11
17:17
[PUBDB-2019-03292] Journal Article
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Residual stress and microstructure evolution in steel tubes for different cooling conditions – Simulation and verification
A finite element modelling approach is applied to investigate the evolution of residual stresses, temperature and phase fraction during quenching of low-alloyed seamless steel tubes. Under real-process quenching conditions, non-continuous cooling occurs that results in a stopping and restarting transformation front throughout the tube's radial direction. [...]
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2019-09-11
17:04
[PUBDB-2019-03291] Journal Article
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Ferrite recrystallization and austenite formation during annealing of cold-rolled advanced high-strength steels: In situ synchrotron X-ray diffraction and modeling
Ferrite recrystallization and austenite formation occurring during annealing of cold-rolled advanced high-strength steels are key mechanisms as they largely determine the final microstructure and mechanical properties. However, the influence of processing parameters on these mechanisms and their interactions is still not fully understood. [...]
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2019-09-11
12:27
OpenAccess [PUBDB-2019-03286] Journal Article
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Quantitative Assessment of the Time to End Bainitic Transformation
Metals 9(9), 925 () [10.3390/met9090925]  GO
Low temperature bainite consists of an intimate mixture of bainitic ferrite and retainedaustenite, usually obtained by isothermal treatments at temperatures close to the martensite starttemperature and below the bainite start temperature. There is widespread belief regarding theextremely long heat treatments necessary to achieve such a microstructure, but still there are nounified and objective criteria to determine the end of the bainitic transformation that allow formeaningful results and its comparison. [...]
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2019-09-11
11:40
Embargoed OpenAccess [PUBDB-2019-03285] Journal Article
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The equation of state of TaC$_{0.99}$ by X-ray diffraction in radial scattering geometry to 32 GPa and 1073 K
We have performed in situ synchrotron X-ray diffraction experiments on TaC$_{0.99}$ compressed in a diamond anvil cell along 3 isothermal pathsto maximum pressure (P)-temperature (T) conditions of 38.8 GPa at 1073 K. By combining measurements performed in axial diffractiongeometry at 296 K and in radial geometry at 673 K and 1073 K, we place constraints on the pressure-volume-temperature (P-V-T) equation ofstate of TaC in a wide range of conditions. [...]
Published on 2019-09-10. Available in OpenAccess from 2020-09-10.: Download fulltextPDF Download fulltextPDF (PDFA);
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