The ball milling of commercial strontium hexaferrite powder for up to 42 h allows a particle size reduction down to 400 nm. Conventional PXRD indicates that the ball-milled samples were single ...Web
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It was found that during ball milling, crystallization occurs in the amorphous ribbon sample with precipitation of an {alpha}-Fe solid solution, and the amorphous sample crystallizes completely into a single {alpha}-Fe nanostructure (rather than {alpha}-Fe and borides as in the usual thermal crystallization products) when the milling time ...Web
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The peaks of PEG are marked by asterisks. It can be assumed that due to the low melting point of PEG (61-63 оС), the formation of its melt at the contacts of particles under collisions and balls hitting is likely under ball-milling, therefore the crystallization of BDA proceeded without its substantial amorphization.Web
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The influence of high energy ball milling process, HEBM, and the presence of TiO 2 nanoparticles on the non-isothermal crystallization and fusion behavior of the HDPE were investigated. HEBM was used to homogeneously disperse TiO 2 nanoparticles into a high density polyethylene, HDPE. Differential scanning calorimetry was used to …Web
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It was found that during ball milling, crystallization occurs in the amorphous ribbon sample with precipitation of an {alpha}-Fe solid solution, and the amorphous sample crystallizes completely into a single {alpha}-Fe nanostructure (rather than {alpha}-Fe and borides as in the usual thermal crystallization products) when the milling time ...Web
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It was found that during ball milling, crystallization occurs in the amorphous ribbon sample with precipitation of an {alpha}-Fe solid solution, and the amorphous sample crystallizes completely into a single {alpha}-Fe nanostructure (rather than {alpha}-Fe and borides as in the usual thermal crystallization products) when the milling time ...Web
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In this study, the crystallization mechanism of the amorphous matrix induced by ball milling was investigated and the phase transformation sequence of amorphous NbCo …Web
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The influence of high energy ball milling process, HEBM, and the presence of TiO2 nanoparticles on the non-isothermal crystallization and fusion behavior of the HDPE were investigated.Web
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5.3.2.4 High-Energy Ball Milling. High-energy ball milling is a ball milling process in which a powder mixture placed in a ball mill is subjected to high-energy collisions from the balls. High-energy ball milling, also called mechanical alloying, can successfully produce fine, uniform dispersions of oxide particles in nickel-base super alloys ...Web
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The U.S. Department of Energy's Office of Scientific and Technical InformationWeb
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The ball milling method is associated with crystal deformation, higher defect density, and increased temperature in the materials. The generated energies …Web
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The crystallization process and products are identical to those of the thermal crystallization. When the milling is performed under the air atmosphere, however, the amorphous Fe 78 Si 9 B 13 alloy gradually crystallizes into a single α-Fe(Si) nanoscale phase, which is quite different from the thermal crystallization and the ball milling ...Web
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methods and crystallization approaches, it is found that ball-milling can facilitates more sufficient and uniform mixing of solid raw materials than manual grinding while steam-assisted crystallization could enhance the migration rate of solid mixture compared to heating treatment under solvent-free conditions. Therefore, it could be concluded ...Web
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High energy ball milling (HEBM) is a well known process of producing a wide range of materials with unique properties [1].Web
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Most drugs after crystallization may have to be comminuted and this physical transformation is required to various extents, often to enhance processability or solubility especially for drugs with limited aqueous solubility. ... Ball milling of ibuprofen and aluminum hydroxide was carried out to facilitate complex formation between ibuprofen …Web
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Microstructure evolution in a melt-spun amorphous Fe77.2Mo0.8Si9B13 alloy subjected to high-energy ball milling was investigated by means of X-ray diffraction (XRD), a transmission electron microscope (TEM), and a differential scanning calorimeter (DSC). It was found that during ball milling, crystallization occurs in the amorphous ribbon …Web
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Furthermore, ball milling technique coupled with chemical and physicochemical pretreatments has been shown to facilitate lignin removal, reduce …Web
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It was found that during ball milling, crystallization occurs in the amorphous ribbon sample with precipitation of an α -Fe solid solution, and the amorphous sample crystallizes …Web
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Unlike ball milling, there is a lack of investigation of structure formation and its developing mechanisms of Ni-Co-Mn-In powders obtained by the mechanical alloying technique. Although MA has been widely used for other alloys, the crystallization kinetics of the MSMAs powders obtained by MA technique has not been studied yet.Web
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While powders (particle size<500 µm) were successfully obtained following high energy ball milling, partial crystallization of powder particles was also observed. Cryo-milling in select conditions fulfilled both the objectives as it successfully converted ribbons into powder retaining the amorphous phase. Powder produced by cryo-milling …Web
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The observed decrease in crystallization temperatures indicates that the Fe 80 Nb 10 B 10 glass become less stable against thermally-activated crystallization after ball milling. Additionally, the thermally-activated crystallization sequence observed after milling is different compared with the sequence observed for the parent as-spun glassy …Web
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It was found that during ball milling, crystallization occurs in the amorphous ribbon sample with precipitation of an {alpha}-Fe solid solution, and the amorphous sample crystallizes completely into a single {alpha}-Fe nanostructure (rather than {alpha}-Fe and borides as in the usual thermal crystallization products) when the milling time ...Web
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1. Introduction. Mechanical alloying (MA) is a well-known way in processing advanced materials involving repeated welding and fracturing the powder particles in a …Web
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Mechanical milling was carried out at room temperature in a shaker mixer mill using vials and balls of hardened steel as the milling media with a ball:powder weight ratio of 10:1. The mixtures ...Web
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When the ball milling time reached 30 h, the powder particles were obviously refined. After the ball milling for 50 h, the average grain size continued to decrease. Nevertheless, the rate of crystallization was significantly reduced. The average particle size of the powder particles gradually became stable when the ball milling time …Web
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The alloy with the chemical composition of Ni25Ti50Cu25 and a weight of 20 g was produced via high-energy ball milling that lasted 100 h, 120 h, and 140 h. After grinding, the powders consisted of an amorphous-nanocrystalline mixture formed from solid solutions based on alloying elements and a phase being a precursor of the intermetallic …Web
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In this study, the crystallization mechanism of the amorphous matrix induced by ball milling was investigated and the phase transformation sequence of amorphous NbCo 1.1 Sn–NbCo 2 Sn full-Heusler was verified. In the ball milling process, the introduction of oxygen and the formation of niobium oxide were observed.Web
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Ball milling of a Cu/Cr 2 O 3 catalyst mixture in the presence of O 2, CO and an excess of H 2 under cryogenic conditions (a stream of cooled nitrogen at −40 °C) enabled preferential CO ...Web
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Solid-state amorphization during mechanical alloying of Fe- x Ti alloys (x = 33.3 and 50 at.%) and the subsequent mechanically-induced crystallization by …Web
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In the first hour of ball-milling the crystallization temperature increased by --~ 5 for the sample precipitated at pH 10.5, ~ 15 for the sample precipitated at pH 7.5, and ~ 50 for the sample precipitated at pH 2.5 thus suggesting that higher precipitation pH produced tougher grains of zirconium hydrox- ide, more resistant to the disordering ...Web
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Herein, we first prepared polychromatic self-crystallized CsPb(Cl/Br/I)3 perovskite nanocrystalline (PN) borosilicate glass by the high-temperature melting method. Then, the PN glass is exposed to frequent mechanical ball milling. Due to the high-energy mechanical force, the microstructure changes in borosilicate glass such as topological …Web
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Ball milling is a grinding method that grinds nanotubes into extremely fine powders. During the ball milling process, the collision between the tiny rigid balls in a concealed …Web
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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.Web
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Solid-state amorphization during mechanical alloying of Fe- x Ti alloys (x = 33.3 and 50 at.%) and the subsequent mechanically-induced crystallization by continued ball milling was studied. In the case of Fe 50Ti, it was revealed that by milling of Fe and Ti powders, firstly the nanocrystalline FeTi intermetallic compound forms, and then, the XRD.Web
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High-energy ball milling (HEBM) process is a powerful solid-state synthesis/powder mechanical alloying method. The objective of this work is to form selenide compounds at different milling times (1–20 h) by HEBM process. ... Additionally, the exothermic crystallization peak is shifted to lower temperatures, 100.5, 100.2, 100, and …Web
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In the latter case, crystallization was observed after ball milling beyond the completion of amorphization reaction (7). While the underlying mechanism for a Solid-State Amorphization Reaction (SSAR) is generally agreed upon (8), that for an amorphous-to-crystalline phase transition is still surrounded by controversy.Web
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Observed partial crystallization of Co 70.3 Fe 4.7 Si 10 B 15 amorphous alloy upon ball milling may be due to different influences; (1) the alloy composition may change due to abrasion from the steel milling balls or vials, (2) the milling may induce additional defects e.g., shear bands which act as preferred sites for precipitation of ...Web
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The ball milling treatment exposed more buried SH groups, which were eventually oxidized to form a disulfide bond during ball milling treatment (Sun, Liu, et al., 2015). As disulfide bond played an important role in the maintenance of the higher structure of protein, these results indicated that ball milling treatment with high collision, shear ...Web
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