amorphization by ball milling a review

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Amorphization of M‐Si (M=Ni, Co, Mo, Mn, and Cr) .

2019-3-20 · Amorphous alloy powders of the silicide type M‐Si (M=Ni, Co, Mo, Mn, and Cr) are produced from crystalline elemental powders by high‐energy ball milling using revolution‐step‐like‐decreasing (RSD) mode. In the ball milling using the RSD mode, after promoting true chemical alloying in milled powder samples under high‐vial rotation of the ball mill in the earlier stage, the medium ...

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Amorphization by ball milling. A review - ScienceDirect

1988-10-1 · 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.

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Amorphization of the Prototypical Zeolitic Imidazolate ...

2012-6-19 · alongside a 10 mm stainless steel milling ball at room temperature and sealed properly. This combination was then subjected to 30 Hz milling in a Retsch MM400 grinder mill for varying times. After milling, the amorphous milling products were recovered and characterized. SI-2: Ball-milling Amorphization

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An X-Ray Diffraction Study of the Crystalline to .

Curve c belongs to the sample holder. Fig. 2 X-ray diffractograms of MC-cellulose samples after ball milling (curves b, to bg). Explanations see Table 1. Curve d belongs to tungsten carbide. N. Stubicar et al: Amorphization of Cellulose by High-Energy Ball Milling o.o ·0.5 -1.0 ·2.5 100 200 300 400 time, t/sec Fig. 3 Plots of In wc resp.

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Destruction, amorphization and reactivity of nano-BN .

2009-8-26 · 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 ...

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(PDF) COMPETITION BETWEEN AMORPHOUS OR .

Amorphization by ball milling. A review. Article. Oct 1988; PHYSICA B; A.W. Weeber; H. Bakker; A new method for the preparation of amorphous alloys is the mechanical alloying process. So far ...

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(PDF) AMORPHIZATION OF SEMICONDUCTORS BY .

This suggests that amorphization in metal-metalloid systems, i.e. ductile-brittle systems, like Fe40Ni40P14B6 is fully achieved by ball milling alone using high milling energy and metalloid ...

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Effect of Mechanical Milling and Cold Pressing on Co .

Abstract. Cold pressing (CP) of the amorphous-like Co powder suppressed most of the XRD peaks, in particular the peak along (100) plane. The DSC curve of unmilled CP Co powder has shown a distinct sharp exothermic peak at 6 1 5 ∘ C.Upon annealing at 7 0 0 ∘ C, only the FCC phase with lattice parameter of 3.51 Å was detected by XRD.Our results implied that the exotherm at 6 1 5 ∘ C ...

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Amorphization and disordering of the Ni3Al ordered ...

Effect of ball-to-powder weight ratio on the amorphization reaction of Al50Ta50 by ball milling. Journal of the Less Common Metals, Vol. 169, Issue. 2, p. 235. Journal of .

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Ball-Milling-Induced Amorphization of Zeolitic .

Amorphization, which can be induced by thermal treatment, compression, or ball-milling is one of such transformations and it has been applied to encapsulate guests of various sizes such as iodine ...

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Amorphization of selenium induced by high-energy .

1997-5-1 · 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 ifmmode^circelsetextdegreefi{}C, respectively. The final milling products under both conditions were found to be a fully amorphous phase after several hours of mechanical ...

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Atomic disorder and amorphization of B2-structure .

1996-1-1 · Still the amorphization may be the result of a sudden step-wise decrease of the LRO parameter to zero value. Bellon and Martin (22) examined the process of disordering in B2 compounds under ballistic influence (irradiation, ball milling).

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Destruction, Amorphization and Reactivity of Nano-BN .

2020-10-13 · 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 400m. 2 /g (at the dose of

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Ball Milled Si-W Alloys: Part I. Microstructural and .

2019-11-30 · The phase evolution, phase composition and grain size of ball milled Si-W alloys were quantitatively measured during the ball milling process. Ball milling was found to proceed in three stages with the amorphization of Si occurring after about 1 hour, followed by the reaction of Si with W to form Si 2 W. After about 3 hours a steady state ...

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Effect of amorphization method on the .

abstract = "Our objective was to characterize the physicochemical properties of amorphous sucrose prepared by freeze-drying (FreD), spray-drying (SprayD), ball milling (BallM), melt-quenching (MeltQ), and spin-melt-quenching (SpinMeltQ).

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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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Ball Milled Si-W Alloys: Part I. Microstructural and .

2019-11-30 · The phase evolution, phase composition and grain size of ball milled Si-W alloys were quantitatively measured during the ball milling process. Ball milling was found to proceed in three stages with the amorphization of Si occurring after about 1 hour, followed by the reaction of Si with W to form Si 2 W. After about 3 hours a steady state ...

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The effects of attrition and ball milling on the ...

2010-5-4 · Commercially produced magnesium diboride powder was modified by attrition milling and ball milling in propan-2-ol for various durations. These powders were characterized by means of particle size distribution measurements using laser diffraction, impurity analysis using x-ray diffraction, energy dispersive spectroscopy and x-ray photoelectron spectroscopy, and scanning electron microscopy, .

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Amorphization of organic compounds by ball milling ...

1997-12-1 · We have analyzed the effect of ball milling on a sample obtained by slow cooling from the liquid state. As an example, in Figure 5, curve c, we show the DSC curve for a sample milled for 20 h. The glass transition appears at 335 K and the crystallization takes place in two steps: a smooth process just after the glass transition and the other ...

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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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Ball-milling-induced crystallization and ball-milling ...

At a low ball milling rate, both the particle size and coercivity decrease slowly and monotonically with increasing milling time. Even after 48 h milling, both powders with an average particle size of about 2 {mu}m still retain about 40%-50% of their initial coercivity.

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Amorphization Induced by Ball — Milling in Some .

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 ...

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Amorphization and disordering of the Ni3Al ordered ...

Effect of ball-to-powder weight ratio on the amorphization reaction of Al50Ta50 by ball milling. Journal of the Less Common Metals, Vol. 169, Issue. 2, p. 235. Journal of .

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Modification of a Rapidly Solidifide AB 2 Type .

2021-1-18 · However, long time milling could decrease the capacity gradually due to the further amorphization of the alloy. The experimental results also showed that the alloy ball-milled with electrochemically catalytic material such as Co3Mo exhibited a better activity than those milled without any additives or with a metal powder such as Cu acting only ...

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Frontiers | Role of Amorphous Phases in Enhancing ...

Here we focus on only three techniques for amorphization: melt quenching, mechanochemical ball milling, and electrochemically induced amorphization. We give a short review about the recent progress in developing high-performance electrode materials for AIBs by means of amorphization engineering. We also describe the microscopic mechanisms of ...

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Pharmaceutics | Free Full-Text | Influence of the .

In this study, the putative correlation between the molecular mobility of a polymer and the ball milling drug amorphization kinetics (i.e., time to reach full drug amorphization, ta) was studied using different grades of dextran (Dex) and polyvinylpyrrolidone (PVP) and the two model drugs indomethacin (IND) and chloramphenicol (CAP). In general, IND had lower ta values than CAP, indicating ...

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Ball-milling-induced amorphization in NixZry .

Ball-milling-induced amorphization in NixZry compounds: A parametric study Chen, Ying (Ian), Bibole, M., Le Hazif, R. and Martin, ... Physical Review B Volume number 48 Issue number 1 Start page 14 End page 21 Total pages ...

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Enhancement of copper dissolution by .

Furthermore, under specific grinding conditions, the planetary ball milling determined also the partial amorphization of covellite. The collision energies corresponding to specific grinding conditions in terms of rotational speed and number of grinding media were assessed by DEM simulations and were related to the specific surface area after ...

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The structure and property characteristics of .

The structural transformation of polycrystalline Si induced by high energy ball milling has been studied. The structure and property characteristics of the milled powder have been investigated by x-ray diffraction, scanning electron microscopy, high-resolution electron microscopy, differential scanning calorimetry, Raman scattering, and infrared absorption spectroscopy.

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Working Volume in High-Energy Ball-Milling Process .

The purpose of this study was to investigate the effect of working volume in the high-energy ball-milling process on the breakage characteristics (i.e., particle size, morphology, and chemical composition) and adsorption performance of rice straw ash. This study was conducted to confirm working volume issue since this parameter has correlations with the scaling-up process, the amount of input ...

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