Abstract
An Al-Cr amorphous powder prepared by mechanically grinding a rapidly solidified ribbon was consolidated by pulsed current sintering at lower temperature than the crystallization temperature. The rapidly solidified Al100-xCrx(x=5-15) ribbons were prepared by single roll method. The quasicrystalline phase existed in the 7-13at%Cr ribbons. By mechanically grinding, the amorphous phase was formed in the powder of 10-15at%Cr. The analysis by XRD and DSC revealed that the mechanically ground Al87Cr13 and Al85Cr13 powders were a single amorphous phase. Al90Cr10 powder consisted of the Al phase and the amorphous phase. A disk specimen of 10mm in diameter was prepared by sintering at 500MPa pressure at 573K with a hard metal die. The consolidated Al90Cr10 had the porosity of 3.3%, while Al87Cr13 had the porosity of 20.7%. The marked difference between them is resulted from the mass flow of the Al in the Al90Cr10 sample to the triple points among the particles.
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