Synthesis of AlFe Intermetallic Nanoparticles by High-Energy Ball Milling

2015 ◽  
Vol 1766 ◽  
pp. 181-186
Author(s):  
G. Rosas ◽  
J. Chihuaque ◽  
E. Bedolla ◽  
R. Esparza ◽  
R. Pérez
Keyword(s):  
Electron Microscopy ◽  
Ball Milling ◽  
High Resolution Electron Microscopy ◽  
High Energy ◽  
Dynamical Theory ◽  
High Energy Ball Milling ◽  
Resolution Electron ◽  
Energy Ball ◽  
Structural Configurations ◽  
Diffraction Patterns

ABSTRACTIn this investigation, the chemical and microstructural characteristics of nanostructured AlFe intermetallic produced by high-energy ball milling have been explored. High purity elemental powders were used as the starting material. The ball milling was carried out at room temperature using a SPEX-8000 mixer/mill. The structure, morphology and compositions of the powders were obtained using X-ray diffraction patterns (XRD), scanning and transmission electron microscopy (STEM). High resolution electron microscopy observations have been used in the nanostructured materials characterization. The structural configurations have been explored through comparisons between experimental HREM images and theoretically simulated images obtained with the multislice method of the dynamical theory of electron diffraction.

The Influence of High-Energy Ball Milling and Sintering Process on the Microstructure and Mechanical Properties of Al-Ni-Y-Co-La Alloy

2013 ◽  
Vol 745-746 ◽  
pp. 281-285
Author(s):  
Y.B. Yuan ◽  
Rui Xiao Zheng ◽  
Su Jing Ge ◽  
Han Yang ◽  
Chao Li Ma
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Ball Milling ◽  
Amorphous Materials ◽  
Volume Fraction ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Process Conditions ◽  
Bulk Alloy ◽  
Energy Ball

Al86Ni7Y4.5Co1La1.5 (at.%) alloy powder was produced by argon gas atomization process. After high-energy ball milling, the powder was consolidated and extruded by using vacuum hot press sintering under different process conditions, sintering temperature, extrusion pressure, sintering time, etc.. The microstructure and morphology of the powder and consolidated bulk alloy were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The phase transformation of the powder was investigated by differential scanning calorimetry (DSC). Mechanical properties of the consolidated bulk alloy were examined. The results showed that as the milling time increase, the volume fraction of amorphous materials and the hardness and yield strength of the bulk alloy were obvious improved.

AlN Nanorods synthesized by a Mechanothermal Process

2011 ◽  
Vol 1288 ◽  
Author(s):  
G. Rosas ◽  
J. Chihuaque ◽  
C. Patiño-Carachure ◽  
R. Esparza ◽  
R. Pérez
Keyword(s):  
Electron Microscopy ◽  
Mechanical Milling ◽  
Annealing Treatment ◽  
High Resolution Electron Microscopy ◽  
Dynamical Theory ◽  
Transmission Electron ◽  
Resolution Electron ◽  
Structural Configurations ◽  
Simulated Images

ABSTRACTWell-crystallized AlN nanorods have been produced by mechanical milling and subsequent annealing treatment of the milling powders (mechanothermal process). High purity AlN powders were used as the starting material. Mechanical milling was carried out in a vibratory SPEX mill for 30 h, using vials and balls of silicon nitride. The annealing treatment was carried out at 1200 ºC for 10 min. The characterization of the samples was performed by X-ray diffractometry and transmission electron microscopy (TEM). TEM observations indicated that the synthesized nanorods consisted of 30 nm in diameter and 100 nm in length. High resolution electron microscopy observations have been used in the structural characterization. AlN nanorods exhibit a well-crystallized structure. The growing direction of the nanorods is close to the [001] direction. The structural configurations have been explored through comparisons between experimental HREM images and theoretically simulated images obtained with the multislice method of the dynamical theory of electron diffraction.

Preparation of Starch Nanoparticles via High-Energy Ball Milling

2016 ◽  
Vol 40 ◽  
pp. 174-179 ◽  
Author(s):  
Hua Lin ◽  
Li Zhao Qin ◽  
He Hong ◽  
Qing Li
Keyword(s):  
Electron Microscopy ◽  
Ball Milling ◽  
Potato Starch ◽  
Particle Surface ◽  
Physical Method ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Spherical Particles ◽  
Scanning Calorimetry ◽  
Energy Ball

Nano-sized starch particles were prepared from potato starch via high-energy ball milling, which is a purely physical method. Scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry, and viscometer were used to analyze the morphology and characteristics of the as-prepared nanoparticles. Spherical particles with an average size of approximately 120 nm were obtained after grinding the samples for 90 min, and the particles were free from any contamination. The particle surface was rough with a plush-like feature, and the adsorption ability was six times higher than that of native starch. Thus, the nano-sized starch particles can be used as a good embedding medium in biomedical and chemical materials.

High-Energy Ball-Milling of FeAl2 and Fe2Al5 Intermetallic Systems

2013 ◽  
Vol 755 ◽  
pp. 47-52 ◽  
Author(s):  
J.R. Romero-Romero ◽  
J. Luis López-Miranda ◽  
R. Esparza ◽  
M.A. Espinosa-Medina ◽  
G. Rosas
Keyword(s):  
Electron Microscopy ◽  
Phase Transformation ◽  
Ball Milling ◽  
High Energy ◽  
Milling Process ◽  
High Energy Ball Milling ◽  
High Symmetry ◽  
Scanning Calorimetry ◽  
Casting Technique ◽  
Energy Ball

In this study, FeAl2 and Fe2Al5 intermetallic alloys were prepared by conventional casting technique. In order to study their structural stability the alloys were subjected to high-energy ball milling process for 1, 2.5, 5 and 10 h. The structural and chemical characterizations were conducted by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and differential scanning calorimetry. After 10 h of milling, the experimental results indicated a phase transformation from FeAl2-triclinic phase to Fe2Al5-ortorrombic structure. This phase transformation is characterized by a change from low to high symmetry systems.

Micron to Sub-Micron Sized Highly Ordered Mesoporous Silica Particles Prepared Using a High Energy Ball Milling Process

2003 ◽  
Vol 775 ◽  
Author(s):  
J. Eric Hampsey ◽  
Claudio L. De Castro ◽  
Byron F. McCaughey ◽  
Donghai Wang ◽  
Brian S. Mitchell ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mesoporous Silica ◽  
Ball Milling ◽  
High Energy ◽  
Silica Particles ◽  
Milling Process ◽  
High Energy Ball Milling ◽  
Ordered Mesoporous Silica ◽  
Ordered Mesoporous ◽  
Energy Ball

AbstractHighly ordered mesoporous silica particles with sizes in the micron to sub-micron range are of great interest due to their applications as catalysts and filler materials. Currently, mesoporous silica particles are synthesized using large amounts of solvent, which is impractical for large scale-up in industry. This paper reports on a high-energy ball milling process that has been employed to create micron to sub-micron sized mesoporous silica particles starting from a silica xerogel prepared by a surfactant self-assembly sol-gel process. We have studied the effect of parameters such as milling media (e.g., zirconia, stainless steel, and steel centered nylon balls), milling time, the presence of surfactants during milling, particle size, and pore structure. Results from transmission electron microscopy (TEM), scanning electron microscopy (SEM), Xray diffraction (XRD), and nitrogen adsorption demonstrate the feasibility of producing large quantities of mesostructured particles by a simple milling process.

EFFECT OF MILLING TIME ON PHASE TRANSITION IN BaTi0.095W0.05O3 NANOCERAMICS SYNTHESIZED BY HIGH-ENERGY BALL MILLING

2013 ◽  
Vol 22 ◽  
pp. 140-147
Author(s):  
SHEELA DEVI ◽  
A. K. JHA
Keyword(s):  
Electron Microscopy ◽  
Ball Milling ◽  
Milling Time ◽  
Ferroelectric Properties ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Activation Process ◽  
Increase With Increase ◽  
Energy Ball ◽  
Barium Titanate Nanoparticles

Nanocrystalline BaTi 0.095 W 0.05 O 3 has been synthesized by mechanical activation process using high-energy ball milling. The powders milled for (10 hours, 20 hours, 30 hours respectively) were characterized by X-ray diffraction (XRD) and Scanning electron microscopy (SEM). Transmission electron microscopy images showed that in W- substituted barium titanate nanoparticles are formed in the range of 20–50 nm. Crystallite size decreases with increasing milling time in the samples. Detailed Dielectric and ferroelectric properties with different milling times are discussed in detail. Diffusivity of the samples increases with milling time. Piezoelectric properties increase with increase in milling time in the samples.

Solid State Reaction Mechanism and Microstructure Evolution of Ni-Al Powders during High Energy Ball Milling Revisited by TEM

2015 ◽  
Vol 21 (4) ◽  
pp. 953-960 ◽  
Author(s):  
Guohua Fan ◽  
Lin Geng ◽  
Yicheng Feng ◽  
Xiping Cui ◽  
Xudong Yan
Keyword(s):  
Electron Microscopy ◽  
Ball Milling ◽  
Microstructure Evolution ◽  
Exothermic Reaction ◽  
Antiphase Boundary ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Diffusion Reaction ◽  
Energy Ball ◽  
Long Range Ordering

AbstractMicrostructure evolution during the formation of B2–NiAl by high energy ball milling of equiatomic elemental mixtures was studied by X-ray diffractometer, scanning electron microscopy, and transmission electron microscopy (TEM). The crystallite size, lattice defects and ordering of the B2–NiAl were monitored via TEM as function of milling time. The diffusion reaction, Ni+Al→NiAl3 or/and Ni2Al3, occurred during high energy ball milling, and to a certain extent offered the stored energy for the explosive exothermic reaction, Ni+Al→B2–NiAl. The fine microstructure of newly formed B2–NiAl after 5 h milling involved high density defects, e.g. antiphase boundary, long range ordering domains, vacancies, and dislocations.

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