Formation of amorphous Al-Cr alloys by mechanical alloying of elemental aluminium and chromium powders

Mechanical alloying (MA) of elemental Al and Cr powders has been performed using a conventional ball-mill. The MA process produces composite metal powders and homogeneously alloyed powders (Al--15Cr, Al--24Cr). During continuous heating at the rate of 0.33K/s exp --1 Al--15 at.% Cr samples ball-mill...

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Bibliographic Details
Published in:Journal of materials science 1990-07, Vol.25 (7), p.3149-3154
Main Authors: Kobayashi, K F, Tachibana, N, Shingu, P H
Format: Article
Language:English
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Summary:Mechanical alloying (MA) of elemental Al and Cr powders has been performed using a conventional ball-mill. The MA process produces composite metal powders and homogeneously alloyed powders (Al--15Cr, Al--24Cr). During continuous heating at the rate of 0.33K/s exp --1 Al--15 at.% Cr samples ball-milled for 800 and 1000 h showed two exothermal peaks. The first peak, which appeared at the lower temperature, corresponds to amorphization of the MA powders. It was confirmed by X-ray and transmission electron microscopy that the heat-treated powders, quenched from a temperature just above the first peak, were amorphous phase. Amorphous Al--Cr alloys were formed using elemental powders by MA and subsequent heat treatment. Graphs, Photomicrographs, Diffraction patterns. 20 ref.--AA(UK/US).
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00587665