Abstract
The presence of oxide layers on the surface of the particles hinder solid-state sintering and significantly deteriorate the mechanical properties of high strength Al-based alloys fabricated by powder metallurgy via sintering, hot pressing, spark plasma sintering, etc. Here we report a synthesis route, which can completely break down the oxide layer in a nanostructured Al-based alloy. The nanostructured aluminum alloy was fabricated by hot pressing of nanostructured powders, which were synthesized by crystallization of amorphous powders. The nanostructured powders contain a high volume fraction of intermetallics embedded in a nanocrystalline Al-matrix. It was found that the oxide layers were broken down as a result of the local shear deformation between the nanoscale intermetallic phases and nanocrystalline fccAl. Consequently, the consolidated powders achieve an oxide layer-free bonding, which avoids crack initiation and propagation along the boundary between the initial powder particles, thus helping to obtain high-performance properties.
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