As another attempt, refining the coarse eutectic and generating the nano- and sub-microcrystalline structures through liquid metal engineering in molten state or through high pressure torsion-deformation in solid state were used. pct) matrix helped to reach the tensile strength of 211.5 MPa, yield stress of 156.5 MPa along with high elongation of 11 pct. Then, combined additions of Sc and Zr, e.g. Due to a negligible solid-state solubility of cerium in aluminum, alloying to generate precipitation hardening was exercised using highly effective Sc. Ī number of directions have been explored to improve the Al–Ce strengthening. However, the cast Al–Ce binary alloys with a yield stress around 50 MPa, offer a limited strengthening that is insufficient for engineering applications. Among alternatives, the Al–Ce system, containing the technologically important Al–Al 11Ce 3 eutectic, is considered with anticipated advantages mainly due to very low solid-state diffusivity of cerium in aluminum. To overcome the present barrier in development of cast aluminum alloys with high temperature capabilities, a novel eutectic with a superior thermal stability to the conventional Al–Si base is needed.

The fractographic analysis revealed that additions of Si caused a transition from largely ductile fracture to the predominantly brittle mode with crack paths propagating mainly along the interface between the coarse AlCeSi 2 lamellae and Al(Si, Mg) solid solution, which explains the measured drastic reduction in the alloy elongation. As-cast microstructure of the Al5Ce0.5Mg base consisting the primary αAl along with 44 pct of the αAl + Al 11Ce 3 eutectic was replaced in the Al5Ce3Si0.5Mg alloy with the αAl + AlCeSi 2 coarse lamellae ternary eutectic, bulky compounds having the Ce-rich core of AlCe 2Si with external shell of Al 2CeSi 2 along with the quaternary eutectic of fine αAl, Si, Al 2MgSi/Al 2Mg 2Si, and Al–Si–Mg-Ce phases. A presence of Si led also to essential changes in the alloy crystallization with the melting range widened substantially from 10 ☌ to 91 ☌ mainly due to a reduction in the solidus level. pct Si to the Al5Ce0.5Mg base increased the room temperature yield stress almost three times, from 47 to 135 MPa, but reduced its elongation by an order of magnitude from 8 pct to that below 1 pct. pct) reference was cast and tested under identical conditions. To determine a role of Si, the Al5Ce0.5Mg (wt. pct) cast hypoeutectic composition, designed based on the commercial A356 (Al–7Si–0.3Mg, wt pct) grade by substituting a portion of Si with Ce. An attempt at strengthening the aluminum-cerium-based alloys through additions of silicon was assessed using the experimental Al5Ce3Si0.5Mg (wt.

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