Abstract
Metal matrix composites, in which crystalline Al was reinforced by particulates of the Al87.5Ni4Sm8.5 amorphous alloy, were produced using cold pressing and hot extrusion processing. Controlled nanoprecipitation was used to improve the mechanical properties of the amorphous alloy. Amorphous melt-spun ribbons were produced by melt-spinning technique and then fragmented in fine powder by high-energy ball milling. Amorphous and pure aluminum powders were mixed in two different proportions: 85:15 and 70:30 (wt%) and homogenized by ball milling. Bulk samples were produced via cold pressing and hot extrusion. Controlled nanoprecipitation within the amorphous alloy was obtained by the correct choice of processing temperature. The composites were analyzed for reinforcement distribution, porosity content, microhardness and compression tests. The results showed that it was possible to control the precipitation by producing almost the same volume fraction of nanocrystals in each condition. Compression tests showed an improvement on the mechanical properties, which were correlated with the presence of the amorphous/nanocrystals reinforcement in the Al-matrix. The compression yield-strengths of the as-extruded composites were 192 and 310 MPa for 15% and 30% in volume of Al87.5Ni4Sm8.5, respectively. These values are significantly higher than the typically found for the AA1100 wrought pure aluminum (180 MPa).
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