Synthesis of Nanocrystalline Fe25Al57.5Ni17.5 by Mechanical Alloying

2012 ◽  
Vol 476-478 ◽  
pp. 1318-1321
Author(s):  
Qi Zhi Cao ◽  
Jing Zhang
Keyword(s):  
Thermal Analysis ◽  
Solid Solution ◽  
Differential Thermal Analysis ◽  
Mechanical Alloying ◽  
Ball Mill ◽  
Structural Changes ◽  
Early Stage ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray

Nanostructured Fe25Al57.5Ni17.5intermetallics was prepared directly by mechanical alloying (MA) in a high-energy planetary ball-mill. The phase transformations and structural changes occurring in the studied material during mechanical alloying were investigated by X-ray diffraction (XRD). Thermal behavior of the milled powders was examined by differential thermal analysis (DTA). Disordered Al(Fe,Ni) solid solution was formed at the early stage. After 50 h of milling, Al(Fe,Ni) solid solution transformed into Al3Ni2，AlFe3，AlFe0.23Ni0.77 phase. The power annealed at temperature 500 results in forming of intermetallics AlFe3 and FeNi3 after 5h milling. The nanocrystalline intermetallic compound was obtained after 500h milling.

Structural Evolution of Mechanically Alloyed Nanocrystalline Fe25Al50Ni25 Intermetallics

2012 ◽  
Vol 476-478 ◽  
pp. 1476-1479
Author(s):  
Qi Zhi Cao ◽  
Jing Zhang ◽  
Jian Ying Li
Keyword(s):  
Solid Solution ◽  
Mechanical Alloying ◽  
Ball Mill ◽  
Structural Changes ◽  
Structural Evolution ◽  
High Energy ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
X Ray ◽  
Unknown Phase

Nanostructured Fe25Al50Ni25intermetallics was prepared directly by mechanical alloying (MA) in a high-energy planetary ball-mill. The phase transformations and structural changes occurring in the studied material during mechanical alloying were investigated by X-ray diffraction (XRD). Thermal behavior of the milled powders was examined by differential thermal analysis (DTA). Disordered Al(Fe,Ni) solid solution was formed After 50 h of milling. Al(Fe,Ni) solid solution milled for 100h transformed into FeNi,FeNi3 and AlNi3 phase. The power annealed at temperature 500 results in forming of intermetallics AlFe0.23Ni0.77, Al1.1Ni0.9 , AlNi and two unknown phase after 5h milling. The nanocrystalline metallic compound was obtained after 100h milling.

Structural Evolution of Mechanically Alloyed Nanocrystalline Al70Fe25Ni5 Intermetallics

2013 ◽  
Vol 275-277 ◽  
pp. 1751-1754
Author(s):  
Zhang Jing ◽  
Qi Zhi Cao ◽  
Zheng Liang Li
Keyword(s):  
Mechanical Alloying ◽  
Solid Solutions ◽  
Ball Mill ◽  
Structural Changes ◽  
Structural Evolution ◽  
High Energy ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
X Ray ◽  
Scanning Electron

Nanostructured Al-25at.%Fe-5at.%Ni intermetallics were prepared directly by mechanical alloying (MA) in a high-energy planetary ball-mill. The phase transformations and structural changes occurring in the studied material during mechanical alloying were investigated by X-ray diffraction (XRD). Scanning electron microscopy (SEM) was employed to examine the morphology of the powders. Thermal behavior of the milled powders was examined by differential thermal analysis (DTA). The solid solutions of Fe (Al) and Ni (Fe) in the Al70Fe25Ni5 system are observed at the early milling stage. The solid solutions transforms into amorphous and disordered Al (Fe, Ni) phase. The last milling products in the Al70Fe25Ni5 system are Al3Ni2, AlFe3 and AlFe0.23Ni0.77 phases.

Study on Character of Ilmenite Modified by Thermal Treatment

2011 ◽  
Vol 284-286 ◽  
pp. 2090-2093 ◽  
Author(s):  
Xue Liang Xiong ◽  
Zhi Yang ◽  
Hong Yong Ouyang
Keyword(s):  
Thermal Analysis ◽  
Solid Solution ◽  
Differential Thermal Analysis ◽  
Thermal Treatment ◽  
Oxidation Temperature ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
X Ray

The character of ilmenite was modified by pretreatment, the effect of pre-oxidation temperature and time on structure of ilmenite were investigated by X-ray diffraction(XRD) and Thermo-gravimetric/differential thermal analysis. The results indicated that new microcrystal rutile and FeTiO3·Fe2O3 solid solution were appeared on the surface of mineral below 800°C, but evident rutile crystals and pseudobrookite Fe2O3·TiO2 were appeared above 850°C with the structure of ilmenite disrupting simultaneously. The preoxidation time increased from 15min to 60min, evident microcrystal rutile and FeTiO3·Fe2O3 solid solution were appeared by degrees without structure of ilmenite breaking.

ADSORPTION OF CYCLOHEXANE AND BENZENE ON MIXED HYDROXIDES AND OXIDES OF MAGNESIUM AND ALUMINIUM

1966 ◽  
Vol 44 (8) ◽  
pp. 877-884 ◽  
Author(s):  
R. I. Razouk ◽  
Sh. Nashed ◽  
F. N. Antonious
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Thermogravimetric Analysis ◽  
Surface Area ◽  
Structural Changes ◽  
Mixed Oxides ◽  
X Ray Diffraction ◽  
Oxide Systems ◽  
X Ray ◽  
Characteristic Lines

Seven mixed hydroxides of magnesium and aluminium were prepared, and phase and structural changes accompanying their dehydration were investigated by differential thermal analysis, thermogravimetric analysis, and X-ray diffraction techniques. The differential thermal analysis curves possess 2 peaks corresponding to those of parent hydroxides together with a new peak, and the thermogravimetric analysis curves show slight inflections. X-ray diffraction patterns of the mixed hydroxides possess the characteristic lines of the parent hydroxides together with three to five new intense lines which might indicate the formation of a double hydroxide. When the mixed hydroxides are progressively heated they give rise to products possessing patterns which first become diffuse and ultimately pass mainly into the spinel pattern.Adsorption isotherms of cyclohexane and benzene were measured on the mixed hydroxides and their dehydration products. Specific surface areas calculated by the application of the Brunauer, Emmett, Teller (B.E.T.) equation are in general in good agreement for the two adsorbates. The surface area increases with rise of dehydration temperature to a maximum at 500–600 °C and then decreases with further rise in temperature. This behavior is common to crystalline oxide systems and may be ascribed to the intermingling of decomposition, re-crystallization, and sintering processes. Variations in the molecular ratio of the mixed oxides (as much as 20-fold), and in the method of preparation, do not much alter the surface area.

Synthesis of High-Purity Fe2TiO5 Powders Utilizing a Local Ironstone

2019 ◽  
Vol 964 ◽  
pp. 50-54 ◽  
Author(s):  
Armayani Armayani ◽  
Irhamsyah Andi ◽  
Pratapa Suminar
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Crystallite Size ◽  
Calcination Temperature ◽  
High Purity ◽  
Ball Mill ◽  
Weight Fraction ◽  
Commercial Product ◽  
X Ray Diffraction ◽  
X Ray

The synthesis of Fe2TiO5 powders has been successfully performed by making use of Fe2O3 and TiO2 powders. The Fe2O3 powder was obtained from local ironstone in Tanah Laut, South Kalimantan, while the TiO2 powder was a commercial product. The Fe2O3 powder was obtained from the local ironstone through coprecipitation method on pH 5, followed by calcination at 800 °C for 1 hour. The synthesis of Fe2TiO5 powder was done by mixing the raw powders using Planetary Ball Mill method for 5 hours. Thermogravimetric dan Differential Thermal Analysis (TG-DTA) was performed to estimate the calcination temperature. The milled mixtures were then calcined at temperatures of 700 – 1100 °C. X-Ray Diffraction (XRD) data showed that Fe2TiO5 formation started at 800 °C with a weight fraction of 3.60 wt%. The XRD data also showed that at 1100 °C the Fe2TiO5 formation has completed. The crystallite size of Fe2TiO5 powders was 50 and 66 nm after calcination at 900 and 1100 °C, respectively.

Microstructure and Property Evolution of Cu90Zr10 Alloy in the Process of Mechanical Alloying

2013 ◽  
Vol 750-752 ◽  
pp. 667-670
Author(s):  
C.J. Li ◽  
L. Teng ◽  
J. Tan ◽  
Q. Yuan ◽  
J.J. Tang ◽  
...  
Keyword(s):  
Solid Solution ◽  
Grain Size ◽  
Mechanical Alloying ◽  
Alloy Powder ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Maximum Value ◽  
Average Grain Size ◽  
Energy Ball

Cu90Zr10 alloy powder was prepared by high-energy ball milling. The microstructure and property evolution of this alloy powder during mechanical alloying (MA) were investigated by using X-ray diffraction and optical microscopy (OM). The alloy powder with an average grain size of 10 - 40 nm was obtained, and the grain size was found to decrease gradually with increasing milling time. The microhardness reached a maximum value (about 295 Hv) after 30 h milling. The internal microstrain and the microhardness of the samples increased due to the grain refinement and solid solution during milling, and 10at.% Zr could be brought into Cu lattice by solid solution during MA. At last, the mechanisms of strengthening were discussed.

Structural, Optical and Thermal Characterizations of Lithium Borate Glasses Containing the Barite

2019 ◽  
Vol 397 ◽  
pp. 24-38 ◽  
Author(s):  
K. Abdellaoui ◽  
I.Z. Hager ◽  
Hosam A. Othman ◽  
A. Boumaza ◽  
Najoua Kamoun
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Glass Transition ◽  
Structural Changes ◽  
Borate Glasses ◽  
Lithium Borate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Amorphous Nature ◽  
F Center

A glass system was prepared according to the formula 60mol%B2O3 – x mol %barite – (40-x) mol %Li2O, where x=0, 5, 7.5, 10, 15 and 20 mol%. The amorphous nature of the prepared glasses was confirmed through X-ray diffraction. The prepared glasses were also characterized by FTIR spectroscopy, UV-vis absorption spectroscopy and the differential thermal analysis (DTA). The density is found to increase and this is because of the higher molecular of the added barite. The molar volume also increases with increasing barite content that indicates the structural changes occurred in borate network that were also confirmed using FTIR. Increasing the concentration of barite shifts the UV cutoff edge toward higher wavelengths from about 300 nm at 0 mol% barite to about 400 nm at 15 mol% of barite. Glass transition temperature (Tg) is found to increase with the increasing barite content. When analyzed by photoluminescence, the samples exhibit luminescence emission centered at around 400, 415, 480, 430, 485, 520, 545, and 570 nm when excited at 300 nm wavelength. The emission peaks at 420 nm, and 440 nm were assigned to F center emission. Between 440 nm and 520 nm it is rather the effect of the presence of the impurities.

Crystallization process and magnetic property of Fe81Zr3Nb6B10 alloy

2015 ◽  
Vol 29 (31) ◽  
pp. 1550196 ◽  
Author(s):  
Y. M. Sun ◽  
W. Q. Yu ◽  
D. Long ◽  
Y. Zhang ◽  
Z. Hua
Keyword(s):  
Thermal Analysis ◽  
Solid Solution ◽  
Magnetic Property ◽  
Differential Thermal Analysis ◽  
Melt Spinning ◽  
Crystallization Process ◽  
Annealing Temperature ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray

[Formula: see text] amorphous alloy was prepared by melt-spinning and annealed at various temperatures. The thermal property, microstructure and magnetic property were investigated by differential thermal analysis (DTA), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The crystallization process of [Formula: see text] alloy is as follow: Amorphous [Formula: see text] residual amorphous [Formula: see text]-[Formula: see text]-[Formula: see text]-[Formula: see text] solid solution. Coercivity [Formula: see text] of [Formula: see text] alloy changes complexly, which abruptly deteriorates at 843 K and then softens with increasing annealing temperature [Formula: see text].

scholarly journals Room-Temperature Synthesis of the TiC, ZrC, HfC, VC, NbC and TaC Powder Monocarbides

2019 ◽  
Vol 7 (1) ◽  
pp. 113-120
Author(s):  
Olesya I. Nakonechna ◽  
Nadezhda N. Belyavina ◽  
Mykola M. Dashevskyi ◽  
Yuriy A. Titov
Keyword(s):  
Crystal Structure ◽  
Mechanical Alloying ◽  
Ball Mill ◽  
Room Temperature ◽  
Diffraction Method ◽  
High Energy ◽  
Argon Atmosphere ◽  
X Ray Diffraction ◽  
Temperature Synthesis ◽  
X Ray

The nanoscaled (up to 30 nm) TiC, ZrC, HfC, VC, NbC and TaC monocarbides with NaCl-type structure have been synthesized from the elemental metals and the carbon nanotubes (CNTs) by mechanical alloying in a high energy planetary ball mill in an argon atmosphere. The powders obtained were examined by X-ray diffraction method. It is shown that mechanical alloying is accompanied by a decrease in the lattice parameters of MeC carbides formed and by a decrease of the total number of atoms in their crystal structure, i.e. by an increase of structural vacancies in the materials obtained. On the whole, monocarbides obtained can be arranged by the simplicity of their formation in a ball mill as: HfC -> ZrC -> TiC -> TaC -> NbC -> VC.

Microstructural Evolution of Cr-Ta Powder in the Process of Mechanical Alloying

2015 ◽  
Vol 1094 ◽  
pp. 300-304
Author(s):  
Jing Yao ◽  
Shi Qiang Lu ◽  
Xuan Xiao
Keyword(s):  
Mechanical Alloying ◽  
Ball Mill ◽  
Supersaturated Solid Solution ◽  
High Energy ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Energy Ball Mill ◽  
The Hours ◽  
Energy Ball

High energy ball mill tests under the condition of the ball material mass ratio 13:1 and the rotate speed 400 r/min have been employed to investigate the process of mechanical alloying (MA) of Ta and Cr powder mixed in the mole ratio of 1:2.The microstructure evolution process and phase composition were explained useing scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that, the milled 20h powder existed in Ta (Cr) supersaturated solid solution and amorphous after 40h. Although the hours were spent on ball milling reached to 50h, Laves phase TaCr2had not been made during the process.

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