Anisotropic mechanical behavior of ultrafine eutectic TiFe cast under non-equilibrium conditions

The effect of solidification conditions on microstructural and mechanical properties of eutectic TiFe alloy cast under different conditions was examined. Samples exhibit different ultrafine eutectic structures (β-Ti(Fe) solid solution + TiFe). Different cooling conditions lead to the evolution of ultrafine eutectic oval-shaped colonies or elongated lamellar colonies with preferred orientation. Isotropic as well as anisotropic mechanical properties were obtained. Alloys exhibit compressive strengths between 2200 and 2700 MPa and plastic strains between 7 and 19 pct. in compression.

Research highlights
► Preparation under non-equilibrium exhibits different ultrafine eutectic structures (beta Ti(Fe)) + TiFe ss).
► Different cooling leads to the evolution of several orientated round – or elongated lamellar colonies with preferred orientation. This causes isotropic and anisotropic mechanical properties.
► The alloy shows compressive strengths of 2200 MPa and plastic strain of 7–19% in compression.
► The directional growth of the lamellae exhibits an epitaxial behavior of the A2/B2 interface.