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Tailoring the microstructure and mechanical properties of Ti-Al alloy using a novel electromagnetic stirring process

Biswas, K.; Hermann, R.; Das, J.; Priede, J.; Gerbeth, G.

The microstructures and mechanical properties of Ti45Al55 alloys were investigated in terms of the melt convection state during solidification. The samples were subjected to conventional induction melting as well as enhanced melt stirring by application of an external magnetic field using a specially designed floating zone arrangement. The stirred samples showed a significant improvement of the plastic deformability (16.9 %) up to 1137 MPa stress. A strong morphology change from dendritic to spherical shape geometry and an increased properitectic phase fraction was observed after stirring. The possible reasons were explained as result of spherical growth under forced convection, rather than a consequence of fragmentation of dendrite arms. An increase in the semi-coherent interfaces between g/a2 interfaces and the lack of orientation anisotropy of the spherical shape (g+a2) colonies in the stirred sample may contribute to the higher deformability of the stirred samples. Reduced Vickers hardness values of the g-matrix and increased hardness of the (g+a2) lamellar structure in the stirred samples is attributed to redistribution of oxygen and reduced interlamellar g/a2 spacing.

  • Scripta Materialia 55(2006)I2, 1143-1146

Permalink: https://www.hzdr.de/publications/Publ-8438
Publ.-Id: 8438