Browsing by Subject "rapid solidification"

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Access status: Open Access ,
Effect of rapid solidification aluminum alloys with different Si contents on mechanical properties and microstructure
(2016) Wzorek, Łukasz; Wiewióra, Marcel; Wędrychowicz, Mateusz; Skrzekut, Tomasz; Noga, Piotr; Wiewióra, Jakub; Sajdak, Wojciech; Richert, Maria Wiesława
Rapid solidification is a relatively new and effective way of producing ultrafine-grained UFG aluminum alloys with enhanced mechanical properties. Due to a significant cooling rate close to nearly 106 K/s, it is possible to obtain a material with grain size far below 100 nm. In the present study, RS aluminum alloys with an Si content in a range of 5–10 wt% were produced during melt spinning. As a result, materials in the form of ribbons were produced. The as-received flakes were subjected to cold pressing into cylindrical billets with a diameter of 40 mm. Hot extrusion of pre-compacted material was subsequently performed at a temperature of 450°C with a press ram speed of 3 mm/s and extrusion ratio of ? = 25. In this work, the influence of brittle phases on the mechanical properties of as-extruded rods will be examined. Both tensile and microhardness tests were performed in order to determine the mechanical properties of the obtained profiles. It has been shown that brittle-phase refinement during melt spinning significantly influences the mechanical properties of the tested materials.