Studies of Crystallite Size and Lattice Strain in Al-Al2o3 Powders Produced by High-Energy Mechanical Milling

Abstract

In the present study mechanical milling used to form nanocrystalline structure in Al-Al 2 O 3 powders. The microstructure of the milled powders was investigated by X-r ay diffraction (XRD) analysis. It was found that the XRD peaks showed a significant broadening, which was related to grain refinement and lattice distortions. X-ray patterns were analyzed using Williamson-Hall treatment to determine the crystallite size and the lattice strain. nanocrystalline powders have been synthesized with microstructure showing a higher lattice strain and an evolution of the finest particles. Microhardness measurements and compression tests were performed to characterize the composite materials.

The Effect of High-Energy Ball Milling Conditions on Microstructure and Hydrogen Desorption Properties of Magnesium Hydride and Single-Walled Carbon Nanotubes

“…Thus, the intensity of diffraction peaks corresponding to the β-MgH 2 phase slightly decreases and slight peak broadening is observed when the speed is varied from 300 to 900 rpm. This can be associated with the reduction in crystallite size as well as the appearance of defects and the increase in lattice strain [40,41]. The increase in the milling time at 300 rpm does not affect the phase composition, and the intensity of the diffraction maxima corresponding to magnesium hydride with an increase in milling time from 60 min to 180 min does not change.…”

Egyptian blue: from pigment to battery electrodes

“…Peak broadening, splitting and impure peaks measured after the milling process can be attributed to changes in the lattice structure induced by the stress of mechanical milling. 15 As shown in Fig. 2c , this simple milling step resulted in a large increase in the capacity.…”

Obtenção de óxidos de Ti-Cu a partir de partículas nanoestruturadas por moagem de alta energia

“…O alargamento dos picos pode ser relacionado a um efeito da presença de nanocristais na estrutura e da amorfização da liga, comportamento presente no sistema Ti-Cu e que já foi abordado na literatura (MAHMOUD; WASLY; DOHEIM, 2014;MHADHBI et al, 2008). Já o deslocamento da posição dos picos está relacionado a deformações presentes nas redes cristalinas que foram potencialmente causadas pela MAE, a qual pode-se introduzir uma grande quantidade de defeitos no material devido às sucessivas colisões sofridas pelas partículas no decorrer desse processo.…”