Phase Composition and Magnetic Behaviour of Iron Sand from Syiah Kuala Beach Prepared by Mechanical Alloying

It has recently been investigated that ball milling can improve the magnetic properties of natural iron sand significantly. In this work, we present the phase composition and magnetic behavior of iron sand from Syiah Kuala Beach, Banda Aceh. Samples were prepared by mechanical alloying method using a Fritsch planetary ball mill for 20 hours. As the results, it was shown by XRD test that Fe3O4 (magnetite) appears as the majority phase and the magnetic properties observation shown that the magnetization saturation (Ms) and remanent (Br) was decreased with the increasing of the coercivity (Hc).

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Influence of Ball Milling Parameters on Preparation of Ti50Cu23Ni20Sn7 Amorphous Alloys Powder

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.55-57.819 ◽

2011 ◽

Vol 55-57 ◽

pp. 819-824

Author(s):

Ge Wang ◽

Qiang Li ◽

Ying Gao ◽

Jing Na Gao ◽

Yu Ying Zhu ◽

...

Keyword(s):

Mechanical Alloying ◽

Ball Milling ◽

Amorphous Alloys ◽

Ball Mill ◽

Milling Time ◽

Rotational Velocity ◽

Weight Ratio ◽

High Energy ◽

Planetary Ball Mill ◽

Milling Parameters

Ti50Cu23Ni20Sn7 amorphous alloys powder was prepared by mechanical alloying (MA) in a high-energy planetary ball mill. Milling parameters such as rotational velocity of ball mill, ball to powder weight ratio as well as milling time were throughly investigated. Mechanism of mechanical alloying was throughly discussed.

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Structure-Phase Transformations in the Course of Solid-State Mechanical Alloying of High-Nitrogen Chromium-Manganese Steels

Metals ◽

10.3390/met11020301 ◽

2021 ◽

Vol 11 (2) ◽

pp. 301

Author(s):

Kirill Lyashkov ◽

Valery Shabashov ◽

Andrey Zamatovskii ◽

Kirill Kozlov ◽

Natalya Kataeva ◽

...

Keyword(s):

Electron Microscopy ◽

Solid State ◽

Mechanical Alloying ◽

Ball Milling ◽

Ball Mill ◽

Subsequent Annealing ◽

High Nitrogen ◽

Transmission Electron ◽

Structure Phase ◽

Manganese Steels

The solid-state mechanical alloying (MA) of high-nitrogen chromium-manganese austenite steel—MA in a planetary ball mill, —was studied by methods of Mössbauer spectroscopy and transmission electron microscopy (TEM). In the capacity of a material for the alloying we used mixtures of the binary Fe–Mn and Fe–Cr alloys with the nitrides CrN (Cr2N) and Mn2N. It is shown that ball milling of the mixtures has led to the occurrence of the α → γ transitions being accompanied by the (i) formation of the solid solutions supersaturated with nitrogen and by (ii) their decomposition with the formation of secondary nitrides. The austenite formed by the ball milling and subsequent annealing at 700–800 °C, was a submicrocrystalline one that contained secondary nano-sized crystalline CrN (Cr2N) nitrides. It has been established that using the nitride Mn2N as nitrogen-containing addition is more preferable for the formation and stabilization of austenite—in the course of the MA and subsequent annealing—because of the formation of the concentration-inhomogeneous regions of γ phase enriched with austenite-forming low-mobile manganese.

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Phase Composition and Magnetic Properties of Nd2Fe14B/α-Fe Nanocomposites Prepared by Mechanical Alloying

Russian Metallurgy (Metally) ◽

10.1134/s0036029518040134 ◽

2018 ◽

Vol 2018 (4) ◽

pp. 354-358 ◽

Cited By ~ 2

Author(s):

A. G. Savchenko ◽

V. P. Menushenkov ◽

A. Yu. Plastinin ◽

I. V. Shchetinin ◽

A. I. Rafal’skii ◽

...

Keyword(s):

Magnetic Properties ◽

Phase Composition ◽

Mechanical Alloying

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Nano-Crystalline Barium Hexaferrite Powders Prepared by Mechanical Alloying Using Acetate Precursor

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.368-372.610 ◽

2008 ◽

Vol 368-372 ◽

pp. 610-612 ◽

Cited By ~ 3

Author(s):

M. Honarvar Nazari ◽

Abolghasem Ataie ◽

S.A. Seyyed Ebrahimi

Keyword(s):

Heat Treatment ◽

Magnetic Properties ◽

Phase Composition ◽

Mechanical Alloying ◽

Thermal Behavior ◽

Crystallite Size ◽

Barium Hexaferrite ◽

Subsequent Heat Treatment ◽

Molar Ratios ◽

Nano Crystalline

Nano-crystalline barium hexaferrite powders have been prepared by mechanical alloying of nFe2O3+Ba(CH3COO)2 with Fe/Ba molar ratios of 10-12 and subsequent heat treatment. Thermal behavior, phase composition, morphology and magnetic properties of samples were studied using DTA/TGA, XRD, SEM and VSM, respectively. Nano-crystalline Ba-hexaferrite with a mean crystallite size of 46 nm and magnetic properties as high as Ms = 73.9 A.m2/kg and Hci = 334.2 kA/m was formed for mixture of 5.5Fe2O3+Ba(CH3COO)2 which was milled for 48 h and then annealed at 1100 °C.

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Modelling of mechanical alloying in a planetary ball mill

Metal Powder Report ◽

10.1016/s0026-0657(99)81148-5 ◽

1995 ◽

Vol 50 (2) ◽

pp. 39-40

Keyword(s):

Mechanical Alloying ◽

Ball Mill ◽

Planetary Ball Mill

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Mechanically Driven Alloying and Magnetic Properties in Immiscible Mn80Bi20 Nanocrystalline Powders

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.873.217 ◽

2013 ◽

Vol 873 ◽

pp. 217-220

Author(s):

Min Xu ◽

Qun Jiao Wang

Keyword(s):

Magnetic Properties ◽

Mechanical Alloying ◽

Saturation Magnetization ◽

Ball Milling ◽

Solid Solubility ◽

Milling Time ◽

Early Stage ◽

Nanocrystalline Powders ◽

X Ray Diffraction ◽

X Ray

The paper has described the formation of nanocrystalline Mn80Bi20powders by mechanical alloying and studied the changes of structure and magnetic properties of the powders during the process of ball milling by using X-ray diffraction and saturation magnetization σsmeasurements. The solid solubility of bismuth in manganese increases with milling time and tends to a stable value after 80h milling. The σsof Mn80Bi20increases abruptly with milling time at the early stage and begins to decrease after 15h. At the time of 15h, the σsreaches a maximum, which is about 7Am2/kg. The result shows an interesting information that the antiferromagnetic Mn and the diamagnetic Bi produce ferromagnetic Mn80Bi20in process of mechanical alloying.

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Properties of Ultrafine-Grained Tungsten Prepared by Ball Milling and Spark Plasma Sintering

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.821.399 ◽

2016 ◽

Vol 821 ◽

pp. 399-404 ◽

Cited By ~ 1

Author(s):

Monika Vilémová ◽

Barbara Nevrlá ◽

Zdenek Pala ◽

Lenka Kocmanová ◽

Marek Janata ◽

...

Keyword(s):

Ball Milling ◽

Spark Plasma Sintering ◽

Ball Mill ◽

Planetary Ball Mill ◽

Coarse Grained ◽

First Wall ◽

Fine Grained ◽

Plasma Sintering ◽

Ultrafine Grained ◽

Spark Plasma

Tungsten is currently considered as the most suitable plasma facing material for the first wall of a nuclear fusion reactor. First wall will be subjected to harsh conditions that will gradually deteriorate properties of the wall material. Some studies point out that fine-grained tungsten could be more resistant to the structure and property changes than coarse-grained tungsten. However, tailoring of tungsten microstructure is very laborious. Due to its high melting point, tungsten is very often processed mechanically and subsequently sintered into a compact body. In this study, preparation of ultrafine-grained tungsten by mechanical processing in a planetary ball mill was examined. Three types of tungsten samples were compared. One was made from coarse grained tungsten powder consolidated by SPS (spark plasma sintering). Other two samples were prepared from the powder processed in a planetary ball mill with and without addition of Y2O3. After ball milling, the powders were consolidated by SPS, i.e. fast sintering process that allows preserving fine-grained structure of the powder material. Properties of the samples such as hardness and thermal conductivity were examined and correlated with the processing history and microstructure.

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Amelioration of Hydrogen Uptake and Release Features of Magnesium Adding a Polymer Polyvinylidene Fluoride via Milling in Hydrogen in a Planetary Ball Mill

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.18839 ◽

2020 ◽

Vol 20 (11) ◽

pp. 7105-7113

Author(s):

Young Jun Kwak ◽

Myoung Youp Song

Keyword(s):

Ball Milling ◽

Ball Mill ◽

Polyvinylidene Fluoride ◽

Hydrogen Uptake ◽

Hydrogen Atmosphere ◽

Hydrogen Release ◽

Planetary Ball Mill ◽

Planetary Ball Milling ◽

Milling In Hydrogen ◽

Uptake And Release

In the present study, a polymer polyvinylidene fluoride (PVDF) was chosen as an adding material to ameliorate hydrogen uptake and release features of Mg. Samples with a composition of 95 wt.% Mg+5 wt.% PVDF (called 95Mg + 5PVDF) were made via milling in hydrogen atmosphere in a planetary ball mill (reactive planetary ball milling). The hydrogen release reaction of magnesium hydride formed in the as-prepared 95Mg+5PVDF during reactive planetary ball milling started at 681 K. In the third cycle (CN = 3), the amount of hydrogen absorbed for 60 min, A (60 min), was 3.44 wt.% hydrogen at 573 K in 12 bar hydrogen. The PVDF is believed to have melted during reactive planetary ball milling, and the sliding or lubrication between Mg particles and hardened steel balls was avoided, leading to a good contact between them and a highly effective milling. The milling in hydrogen atmosphere in a planetary ball mill of Mg with PVDF is believed to have generated defects and cracks. The Mg2C3 produced from PVDF during hydrogen uptake-release cycling is believed to have been spread among particles and to have kept particles from coalescing. To the best of our knowledge, this is the first study to use a polymer PVDF as an additive material for the amelioration of hydrogen uptake and release features of Mg.

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