Abstract
A nucleation-growth control for Al85Ni10Ce5 glass has transformed to a growth control for Al83Ni10Ce5Si2 glass. That's to say a small quantity of Si addition can successfully separate the Al phase to single precipitate from a eutectic precipitation composited of Al and other intermetallic compound to synthesize nanostructured materials, characteristic of microstructures with finely dispersed nanoccrystalline Al in an amorphous matrix. Favorablyno evident decrease of glass forming ability is observed in the transformation. We suggest that the Si atoms solve into Al lattice to sever as pre- exist nucleus for fcc-Al, in the same time; a nucleation reaction of fcc-Al is accompanied to compensate the nucleation rate. EXPERIMENTAL Ingots, with nominal composition Al83Ni10Ce5Si2, were prepared by arc melting a mixture of pure Al (99.99 wt. %), Ni (99.97wt. %), Ce (99.96 wt. %) and Si (99.97 wt. %) in a purified argon atmosphere. Amorphous ribbons of thickness about 30 um and width about 2 mm were prepared from the master alloy ingots by a single roller melting-spinning apparatus. The precipitated phases at different temperature were assessed by XRD (D/max-rB) using Cu Kradiation. The thermal properties were characterized by using a differential scanning calriometry (Netzsch DSC 404). High resolution transmission electron microscopy (HRTEM) observations were performed on a TECNAL 20U-TWIN.
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