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Annealing Effects in Cast Commercial Aluminium Al–Mg–Zn–Cu(–Sc–Zr) Alloys
Martin Vlach,Jakub Čížek,Veronika Kodetová,Tomáš Kekule,František Lukáč,Miroslav Cieslar,Hana Kudrnová,Lucia Bajtošová,Michal Leibner,Petr Harcuba,Jaroslav Málek,Volkmar Neubert 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
Precipitation reactions of the cast Al–3.4 at%Mg–2.7 at%Zn–0.80 at%Cu–0.10 at%Fe–0.05 at%Si alloy with and withoutaddition of 0.14 at%Sc and 0.06 at%Zr were characterized by electrical resistometry, electron microscopy, X-ray diffraction,thermal analysis, microhardness testing, and positron annihilation. The AlMgZnCuScZr alloy contains a grain boundaryT-phase (Mg32(Al,Cu,Zn)49) with a cubic and/or quasicrystalline structure. The AlMgZnCu alloy contains a mixture ofMgZn2-and the T-phase. Primary multilayer Al3(Sc,Zr) particles precipitated during casting and subsequent cooling. Theparticles have a layered Al3(Sc,Zr) + α-Al + Al3(Sc,Zr) structure, i.e. consist of regions enriched with both Sc and Zr. Smallatomic Mg,Zn(,Cu)-rich clusters coherent with the matrix were formed during the cooling of both alloys and/or in the courseof their storage at ambient temperature. Their dissolution enables precipitation of the transient η′- and/or stable η-phasesof the AlZnMgCu system in both investigated alloys. The effective activation energy for the dissolution of the clusters wascalculated as ~ 103 kJ/mol. Annealing of the AlMgZnCuScZr alloy above 300 °C leads to a formation of the secondaryAl3(Sc,Zr) particles which cause precipitation hardening and guarantee thermal stability of mechanical properties. Additionof Sc and Zr micro alloying elements resulted in a substantial grain refinement. The grain size remains unchanged upto isochronal annealing at 390 °C.
Lutz, M.F.M.,Lange, J.S.,Pennington, M.,Bettoni, D.,Brambilla, N.,Crede, V.,Eidelman, S.,Gillitzer, A.,Gradl, W.,Lang, C.B.,Metag, V.,Nakano, T.,Nieves, J.,Neubert, S.,Oka, M.,Olsen, S.L.,Pappagallo, North Holland Pub. Co 2016 Nuclear physics. A Vol.948 No.-
<P>We report on the EMMI Rapid Reaction Task Force meeting 'Resonances in QCD', which took place at GSI October 12-14,2015. A group of 26 people met to discuss the physics of resonances in QCD. The aim of the meeting was defined by the following three key questions: What is needed to understand the physics of resonances in QCD? Where does QCD lead us to expect resonances with exotic quantum numbers? What experimental efforts are required to arrive at a coherent picture? For light mesons and baryons only those with up, down and strange quark content were considered. For heavy-light and heavy-heavy meson systems, those with charm quarks were the focus. This document summarizes the discussions by the participants, which in turn led to the coherent conclusions we present here. (C) 2016 Elsevier B.V. All rights reserved.</P>
Semi-Insulating 4~6-Inch GaAs Crystals Grown in Low Temperature Gradients by the VCz Method
P.Rudolph,M.Czupalla,Ch.Frank-Rotsch,F.Kiessling,M.Neubert,M.Pietsch 한양대학교 세라믹연구소 2003 Journal of Ceramic Processing Research Vol.4 No.2
The results of growth of semi-insulating GaAs crystals with diameters of 100-150 mm and lengths up to 200 mm from the melt with starting charges up to 25 kg by the low-temperature gradient Vapour Pressure Controlled Czochralski method (VCz) are given and compared with the state of art of LEC growth. The methodical process optimization was assisted by global numerical simulations. A slightly convex interface morphology has been found to be the most suitable for moderate EPD of ~104 cm-2 in 150-mm crystals whilst simultaneously depressing the probability of dislocation bunchings. The carbon concentration was controlled down to values below 1014 cm-3. Electrical properties, including the EL2° content, are discussed. The first results of GaAs VCz crystals grown without B2O3 encapsulant are given. A reduced boron concentration but enhanced carbon and vacancy concentrations have been observed.
Exploring the Ecology of Deep-Sea Hydrothermal Vents in a Metacommunity Framework
Mullineaux, Lauren S.,Metaxas, Anna,Beaulieu, Stace E.,Bright, Monika,Gollner, Sabine,Grupe, Benjamin M.,Herrera, Santiago,Kellner, Julie B.,Levin, Lisa A.,Mitarai, Satoshi,Neubert, Michael G.,Thurnhe Frontiers Media SA 2018 Frontiers in marine science Vol.5 No.-