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Amorphization was observed in the Spex mill with a linear increase in the milling time for amorphization with increasing milling temperature. No amorphization was observed in the less energetic vibratory mill, and the grain size saturated to a constant value of 15 nm after ≥60 h of milling.
Solid-state amorphization during mechanical alloying of Fe-xTi alloys (x = 33.3 and 50 at.%) and the subsequent mechanically-induced crystallization by continued ball milling was studied.
Abstract. We report on the crystal to amorphous phase transition induced by ball — milling in pure Si and pure Ge powders. Based on X-ray diffraction patterns, scanning and transmission electron micrographs, EDX microanalyses, differential thermal analyses and differential scanning calorimetry, it seems that amorphization occurs during the continuous decrease of the particle grain size and ...
Effect of ball-milling pretreatment on pyrolysis characteristics of cellulose was studied by thermogravimetric analysis (TGA) at four different heating rates; 5, 10, 20, and 40 K/min. Variation in ...
Dec 21, 2004· We present a new approach, namely ball milling, to synthesize amorphous boron nitride (a‐BN).The amorphization kinetics are revealed by X‐ray diffractometry (XRD), high‐resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS).
PDF | Recent results have demonstrated that ball - milling may produce a partialamorphisation of a pure crystalline semiconductor such as silicon, contrary to thegeneral belief. In a series of ...
Physica B 153 (1988) 93-135 North-Holland, Amsterdam AMORPHIZATION BY BALL MILLING. A REVIEW A.W. WEEBER and H. BAKKER Natuurkundig Laboratoriurn der Universiteit van Amsterdam, Valckenierstraat 65, NL-IOI8 XE Amsterdam, The Netherlands" Received 1 March 1988 A new method for the preparation of amorphous alloys is the mechanical alloying process.
When the milling time was increased to 60–90 h, the nanocrystalline disappeared and the complete amorphization of the milled Ti 50 Fe 50 alloys occurred. However, a small amount of the nanocrystalline TiFe was formed except for a large of amorphous phase in Ti 50 Fe 50 alloys for 100 h.
amorphization with an appeal to the destabilization of the crystalline phase in favor of the ... 1.3 Ball Milling Review Ball milling is one process for mechanical alloying. A ball mill is a device which agitates vials containing milling balls and powder specimens. Collisions between the balls, vial,
Apr 29, 2011· It has been reported that the impact energy of HEBM is typically 1000 times higher than the conventional ball milling energy.43 The major use of the conventional ball milling is to fracture the particles and to reduce the size, while in high energy ball milling, a longer milling time can be achieved, which can help to activate and complete the ...
Feb 07, 2013· The aim of this paper is to investigate the physicochemical properties of binary amorphous dispersions of poorly soluble sulfonamide/polymeric excipient prepared by ball milling. The sulfonamides selected were sulfathiazole (STZ), sulfadimidine (SDM), sulfamerazine (SMZ) and sulfadiazine (SDZ). The ...
L.C. Zhang et al., "Enhanced Amorphization by Sn Substitution for Si and B in the Ball-Milled Ti 50 Ni 22 Cu 18 Al 4 Si 4 B 2 Alloy", Journal of Metastable and .
Dec 30, 2015· Abstract. Effect of ball-milling pretreatment on pyrolysis characteristics of cellulose was studied by thermogravimetric analysis (TGA) at four different heating rates; 5, 10, 20, and 40 K/min. Variation in the thermal stability and activation energy of cellulose with ball-milling were calculated by TGA Kinetics using Kissinger, Kissinger–Akahira–Sunose, Flynn–Wall–Ozawa and Starink ...
@article{osti_121192, title = {Investigation of the interfaces of silicon-silicon dioxide thin films and ball-milled tin-germanium (silicon) powders using x-ray techniques}, author = {Jayanetti, J.K.D.S.}, abstractNote = {The Si/So{sub 2} thin film interface and Sn/Ge(Si) interfaces in ballmilled Sn-Ge(Si) powders are investigated using x-ray reflectivity and EXAFS, respectively.
T1 - Understanding the amorphization of indomethacin during ball milling using thermal techniques. AU - Das, Shyamal Chandra. AU - Stewart, Peter James. AU - Gaisford, S. PY - 2012. Y1 - 2012. N2 - As part of ongoing work, we report here the effect of time, and rotation speed on the amorphization of the poorly water soluble drug indomethacin.
the Si/Al ratio.16 Furthermore, ball-milling of zeolites can cause changes in particle size,17 morphology,18 and even amorphization.19 Motivated by the dearth of detailed information on the amorphization of ZIFs compared with zeolites, we present a study on the time dependence of ball-milling induced amorphization on
HRTEM and EELS Studies on the Amorphization of Hexagonal Boron Nitride Induced by Ball Milling. Authors. Jianyu Y. Huang, Corresponding author. Research Center for Ultrahigh-Voltage Electron Microscopy, Osaka University, Suita, Osaka 565, Japan; and ...
the book will especially benefit metallurgists unacquainted with ball milling fabrication. ... of amorphous alloys by mechanical alloying process 8.3 crystal-to-glass transition 8.4 mechanism of amorphization by mechanical alloying process 8.5 the glass-forming range 8.6 amorphization via mechanical alloying when -hfor = zero; mechanical solid ...
Amorphization of Aluminum Base Multicomponent Systems by Ball Milling (Overview) ... at several milling conditions. In this review, we summarize the experimental and fundamental data on the Al ...
To prepare the powder for the use of the kinetic spray, the amorphization and grain refinement of ZrO 2 powder in mechanical ball milling were studied. The results showed that the amorphization and grain refinement were improved because of the formation of solid solution when the CeO 2 agent was added. Subsequently, a nearly spherical powder ...
The effects of ball‐milling and cryomilling on sulfamerazine forms I and II (SMZ FI, FII) were investigated using X‐ray powder diffraction, infrared and near‐infrared (NIR) spectroscopy. Cryomilling resulted in a complete amorphization of both polymorphs. Milling at room temperature gave mixtures of amorphous SMZ (FA) and FII.
Phenomenology of Amorphization by MM Amorphization by MM consists of energizing the crystalline solid by the severe cyclic deformation that ball-milling provides. It is significant that ball-milling has been found to induce extensive plastic deformation even into extremely brittle materials such as A 15 intermetallic compounds like 'hn^Sn (6).
CONCLUSION As a conclusion of this work, the following process for amorphization by mechanical alloying of bimetallic powders is proposed: as ball milling proceeds, the solid solution is continuously enriched with thesolute component and becomes supersaturated (16); simulta- NANOCRYSTALUNE TO GLASS TRANSITION DURING BALL MILLING 963 neously ...
Synthesis of nanomaterials by a simple, low cost and in high yield has been a great challenge since the very early development of nanoscience. Various bottom and top down approaches have been developed so far, for the commercial production of nanomaterials. Among all top down approaches, high energy ball milling, has been widely exploited for the synthesis of various nanomaterials, nanograins ...
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