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Y 3 Al 5 O 12:Eu 3+ powders were synthesized by using a high-energy ball mill (HEB) and conventional solid-state reaction method (SSR). The effects of the synthesis procedure on the crystallinity, morphology, structure, and luminescence spectra were examined by X-ray diffraction, field emission-scanning electron microscopy, and photoluminescence spectroscopy.
in the ball-milling procedure in air. A high-tem- perature Sb203 phase was formed which allowed us to conclude that the local temperature in the ball-milling process was of the order of the crystallization temperature of the amorphous phase. In the MA process the Sb203 oxide appeared
Crystallization kinetics of amorphous selenium prepared by ball milling technique: Evidence of three crystallization regimes. ... Ball milling technique gated and analyzed using HoffmaneLauritzen theory. which is free from this limitation is widely used to obtain amor- phous samples . Extensive studies exist on the kinetics of 2.
Supply and Demand in the Ball Mill: Competitive Cocrystal Reactions. ... density functional theory is used to evaluate the energetic stability of 350 observed cocrystals with respect to the crystal structures of the separate coformers. The results demonstrate that the vast majority of known cocrystals are more stable than the stoichiometrically ...
Ball milling progressively hinders the formation of Nb 5 Fe 33 B 10 as primary crystallization product and promotes the formation of α-Fe at low temperatures. This behavior is visible already in the powder milled for 20 h ( Fig. 2 (b)), where α-Fe and Nb 5 Fe 33 B 10 coexist up to 998 K.
Abstract Formation of Al 50 Ti 50, Al 50 Ti 45 Ni 5 and Al 50 Ti 40 Ni 10 amorphous alloys by ball milling and their mechanical crystallization upon further milling have been investigated. Ni addition improves the thermal stability and increases the strength of the powder compacts obtained by hot pressing.
Influence of ball mill processing on the crystallization kinetics of amorphous alloy Ni78Si10B12
Local heating occurring under high- and low-energy millings only plays a minor role and leads to a slight shift of the crystallization products towards equilibrium state. Mechanical deformation was established as the primary cause of crystallization of the amorphous Fe-Zr alloy under ball milling.
The crystallization, microstructure and density of both the powders were studied with and without ball milling. The ball milled powders prepared in conventional method were found to be sintered upto 92% of the theoretical density, whereas the powders prepared in constant pH precipitation method after ball milling showed 97% of the theoretical ...
Phase transformation induced by ball-milling was studied in this work. It was found that amorphous Fe90Zr10 ribbons undergo crystallization into BCC α-Fe(Zr) under milling in an AGO-2 mill. The decomposition degree of the amorphous phase increased with increasing milling time and intensity.
If ball-milling is to be used effectively for the synthesis of amorphous powders it is essential that the underlying mechanism for the crystallization reaction be well understood. The present work was undertaken to understand the effect of contamination by the milling atmosphere on the crystallization reaction during milling.
The existence of the short-range ordered structure will accelerate the crystallization rate, and hence, imperfect crystals formed before reaching the desired crystallization temperature of FHTM-12hM-PPS due to higher bonding density between nano-Si[O.sub.x] and PPS caused by ball milling …
Ball-Milling-Induced Crystallization and Ball-Milling Effect on Thermal Crystallization Kinetics in an Amorphous FeMoSiB Alloy F.Q. GUO and K. LU Microstructure evolution in a melt-spun amorphous Fe 77.2 Mo 0.8 Si 9 B 13 alloy subjected to high-energy ball milling was investigated by means of X-ray diffraction (XRD), a transmission electron micro-
engineering and mining journal ball mill_Alaska Journal Tim BradnerWhats in the crystal ball for the 2018 governors race? The view is still cloudy but vague images can be discerned in …
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Ball milling of melt-spun Fe 90 Zr 10 ribbons in a planetary ball mill (AGO-2) induces their crystallization into supersaturated α-Fe(Zr) grains. The crystallization degree of the amorphous phase increases with increasing milling time, with a fully crystalline state being obtained after 30 min at a milling speed of 1000 rpm.
title = "The role of impurities in the crystallization of ball-milled amorphous alloys", abstract = "Melt spun amorphous Fe83B17 ribbons were pulverized in a planetary ball mill. Two parallel sets of experiment were made, where the material of the vial made the only difference in the experimental conditions.
I.A. Tomilin et al., "The Influence of Ball Milling on the Kinetics of Crystallization of the Amorphous Alloy Ni 78 Si 10 B 12", Materials Science Forum, Vols. 88-90, pp. 289-296, 1992
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When you screening co-crystals, is there any difference of mechanical ball milling and manually grinding? The intensity must be different, will it affect the formation of co-crystal in theory? It ...
The crystallization induced by mechanical milling and thermal annealing are compared and it is suggested that the induction of crystallization by ball milling may be a promising technique for preparing soft magnetic materials in powder form.
Crystallization of A Fe 36Ni 36B 28 metallic glass during ball-milling. Download. ... Contamination by the milling media and/or atmosphere was also reported to lead to crystallization during milling (7). If ball-milling is to be used effectively for the synthesis of amorphous powders it is essential that the underlying mechanism for the ...
ball milling was investigated by means of magnetothermal analysis and X-ray di•raction. Following structural relax- ation and stress relief processes, a metastable phase precipitates during primary crystallization, and a mixture of in-
The ball-milling of cellulose fibers and recrystallization effects. Authors. J. A. Howsmon, Research and Development Division, American Viscose Corporation, Marcus Hook, Pennsylvania ... A study has been made of the effect of fine structure on the decrystallization process which results from the ball-milling of cellulose. ... John R. Mitchell ...
Fe90Zr10 was chosen as a model system to elucidate the roles of mechanical deformation and local heating in the phenomenon of ball-milling-induced crystallization of amorphous alloys.
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