amorphization by ball milling a review

  • Amorphization by ball milling. A review ScienceDirect

    01/10/1988· 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. So far, three amorphization reaction

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  • Amorphization by ball milling. A review ScienceDirect

    A new method for the preparation of amorphous alloys is the mechanical alloying process. So far, three amorphization reaction types were observed when this technique is used. Which reaction type occurs depends on the local conditions during the milling, such as impact energy and local temperature just after an impact. Amorphous alloys prepared by milling following different reaction types are

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  • Amorphization by ball milling. A review NASA/ADS

    01/10/1988· A new method for the preparation of amorphous alloys is the mechanical alloying process. So far, three amorphization reaction types were observed when this technique is used. Which reaction type occurs depends on the local conditions during the milling, such as impact energy and local temperature just after an impact. Amorphous alloys prepared by milling following different reaction

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  • amorphization by ball milling a review

    (For a recent review, ball milling produces powder particles with aget price. HRTEM and EELS Studies on the Amorphization of HRTEM and EELS Studies on the Amorphization of Hexagonal Boron Nitride Induced by Ball namely ball milling, Inorganic Graphene Analogs, Annual Review ofget price. Amorphization mechanisms in Al{sub x}Ga{sub x}As Amorphization mechanisms in

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  • Amorphization of selenium induced by high-energy ball

    01/05/1997· Structural changes occurring in the crystalline element selenium upon high-energy ball milling has been studied. Milling experiments have been performed at the ambient temperature and at a cryogenic temperature of -100 °C, respectively. The final milling products under both conditions were found to be a fully amorphous phase after several hours of mechanical milling. Calorimetric evidences indicate that during cryogenic-temperature milling amorphization

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  • (PDF) AMORPHIZATION OF SEMICONDUCTORS BY BALL

    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

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  • Amorphization mechanisms of NiZr2 by ball-milling

    The microstructure of NiZr 2 in the course of amorphization by ball-milling is studied by transmission electron microscopy (TEM) and x-ray diffraction (XRD). The evolution from the initial fully crystalline alloy to a fully amorphized material is described. It is shown that prior to amorphization, the powder aggregates achieve a 100% nanocrystalline structure; the amorphous phase then appears

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  • Destruction, amorphization and reactivity of nano-BN

    26/08/2009· The BN destruction and amorphization under ball milling. Fig. 2 shows the dependence of specific surface area measured by BET on the dose of mechanical treatment. At the initial stage of mechanical treatment specific surface area increases with increase of the dose, reaches maximum of about 400 m 2 /g (at the dose of 6–8 kJ/g), and then decreases as the dose continues to increase.

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  • Overview of milling techniques for improving the

    01/07/2015· Ball milling of ibuprofen and aluminum hydroxide was carried out to facilitate complex formation between ibuprofen and aluminum hydroxide as well as drug amorphization which enhanced the dissolution of ibuprofen . The incorporation of excipients may, in some cases, mitigate milling-induced drug amorphization. It was demonstrated that the co-milling of salbutamol sulfate with crystalline excipients (α-lactose monohydrate, adipic acid, magnesium stearate) in a ball mill

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  • Amorphization by mechanical alloying ScienceDirect

    01/02/1990· Johnson7 has reviewed the fundamental thermo- dynamics and kinetic factors of amorphization in metallic systems with emphasis placed on the me- chanisms for solid-state amorphization. Weeber and Bakker8 have recently reviewed amorphization by ball milling. Two major categories of amorphization by ball milling can be identified: 1. Mechanical alloying (MA) of

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  • Weeber, A.W. and Bakker, H. (1988) Amorphization by Ball

    Weeber, A.W. and Bakker, H. (1988) Amorphization by Ball Milling. A Review. Physica B, 153, 93.

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  • Amorphization mechanisms of NiZr2 by ball-milling

    The microstructure of NiZr 2 in the course of amorphization by ball-milling is studied by transmission electron microscopy (TEM) and x-ray diffraction (XRD). The evolution from the initial fully crystalline alloy to a fully amorphized material is described. It is shown that prior to amorphization, the powder aggregates achieve a 100% nanocrystalline structure; the amorphous phase then appears

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  • (PDF) Amorphization of Aluminum Base Multicomponent

    The alloys were ground by a planetary ball mill for 2 h in order to obtain a fine powder. The Mg-23.5Ni-5Cu alloy had crystalline Mg and Mg2Ni phases. Mg-23.5Ni-5Cu had an effective hydrogen

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  • Amorphization of the prototypical zeolitic imidazolate

    We report the rapid amorphization of the prototypical substituted zeolitic imidazolate framework, ZIF-8, by ball-milling.The resultant amorphous ZIF-8 (a m ZIF-8) possesses a continuous random network (CRN) topology with a higher density and a lower porosity than its crystalline counterpart.A decrease in thermal stability upon amorphization is also evident.

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  • Amorphization of organic compounds by ball milling

    DOI: 10.1016/S0025-5408(97)00162-1 Corpus ID: 97836007. Amorphization of organic compounds by ball milling @article{Font1997AmorphizationOO, title={Amorphization of organic compounds by ball milling}, author={J. Font and J. Muntasell and E. Cesari}, journal={Materials Research Bulletin}, year={1997}, volume={32}, pages={1691-1696} }

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  • Amorphization of organic compounds by ball milling

    Amorphization of organic compounds by ball milling. Author links open overlay panel Joan Font 1 Joaquim Muntasell 1 Eduard Cesari 2. Show more

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  • Ball-milling-induced amorphization in Ni x Zr y

    A vibrating frame grinder has been instrumented for evaluating the amplitude and frequency of ball oscillation, as a function of the amplitude of vibration of the frame and of the ball mass. Based on such measurements, it is found that Ni x Zr y compounds become fully amorphized provided the specific milling intensity is greater than a temperature- and composition-dependent threshold value.

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  • [PDF] Amorphization of the prototypical zeolitic

    We report the rapid amorphization of the prototypical substituted zeolitic imidazolate framework, ZIF-8, by ball-milling. The resultant amorphous ZIF-8 (a(m)ZIF-8) possesses a continuous random network (CRN) topology with a higher density and a lower porosity than its crystalline counterpart. A decrease in thermal stability upon amorphization is also evident.

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  • Disordering and amorphization of L12-type alloys by

    This is in contrast to the Zr 3 Al compound (also L1 2-type) for which a short milling time is sufficient for obtaining complete amorphization. Variations in the aptitudes toward amorphization of the three L1 2 -type alloys under ball-milling conditions are attributed in part to the differences in the lattice stability terms of their disordered fcc phases.

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  • Enhanced Amorphization by Sn Substitution for Si and B

    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 p.488. Electron Structure, Stability and Nanocrystallization of Al Based Amorphous Alloys p.494. Local Order Changes in Amorphous Zr 52.5 Hf 2 Ti 7.5 Cu 20 Al 10 Ni 8 Alloy upon Crystallization p.499. Particle-Size Dependence of Crystalline-to-Liquid (C→L) Phase Change in

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