منابع مشابه
Characterization of Hypereutectic Al-Si Powders Solidified under Far-From Equilibrium Conditions
The rapid solidification microstructure of gas-atomized Al-Si powders of 15, 18, 25, and 50 wt pct Si were examined using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). In order of increasing particle size, the powders exhibited microcellular Al, cellular/dendritic Al, eutectic Al, and primary Si growth morphologies. Interface velocity and undercooling were estim...
متن کاملMICROSTRUCTURE OF A RAPIDLY SOLIDIFIED Al-4V-2Fe ULTRAHIGH STRENGTH ALUMINUM ALLOY
Microstructure of a rapidly solidified Al-4V-2Fe alloy has been examined in detail by means of transmission electron microscopy and atom probe field ion microscopy. It is composed of a mixture of α-Al and amorphous phases. α-Al grains are relatively large (400 nm), but nanoscale domains of amorphous phase are trapped in the fcc grains. The interface between the α-Al and amorphous phases are ver...
متن کاملFIB cross-sectioning of a single rapidly solidified hypereutectic Al-Si powder particle for HRTEM.
A creative technique of in-situ focused ion beam (FIB) extraction was introduced to prepare a gas atomized rapidly solidified hypereutectic Al-Si single particle's cross-section for High Resolution Transmission Electron Microscopy (HRTEM) analysis. This preparation technique may be employed to characterize very inimitable samples that are abnormally wrought or intricate to prepare through tradi...
متن کاملTEM INVESTIGATION OF RAPIDLY SOLIDIFIED NDFEB HARD MAGNETIC MATERIAL
The surface condition and microstructure of near stoichiometric (Fe823Ndll.8B5.9) Nd-Fe-B alloy ribbons and the effect of melt spinning parameters were investigated using optical, scanning and transmission electron microscopes (SEM, TEM). The formation of gas pockets on the roll surface of the ribbons during melt spinning can prevent heat transform and result in local coarse grains. The local t...
متن کاملA Fim/ap Investigation of a Rapidly Solidified Aluminium-chromium Alloy
A rapidly solidified A1 6 to gwt%Cr alloy formed by vapour deposition has been studied by field-ion microscopy and atom probe microanalysis (FIM/AP). The as-deposited material was found to contain brightly imaging Cr-rich particles, both spherical and rod-shaped, of about 0.5-lnm in diameter and up to 5nm long. Random area AP analysis showed the presence of Cr-enrichment on a very fine scale, w...
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ژورنال
عنوان ژورنال: Journal of the Japan Society of Powder and Powder Metallurgy
سال: 1994
ISSN: 0532-8799,1880-9014
DOI: 10.2497/jjspm.41.945