Exploring an alloy space in a new generation γ-TiAl system Ti–xAl–yNb–1Cr–1Mo–0.2C–0.2B (at.%)): Aspects of phase transformation, microstructure and texture

The compositional sensitivity of phase transformation and resulting microstructure and texture has been systematically studied for a new generation γ-TiAl-based intermetallic system (Ti, Al, Nb, Cr, Mo, C, B). Systematic increase of Al and decrease of Nb content in this complex multi-component system revealed that the solidification path varied in the sequence of β solidification, hypo-peritectic solidification, hyper-peritectic solidification, and α solidification, consequently resulting in very different cast microstructure, texture, and elemental segregation. The alloy system involves multitudes of solid-state phase transformations, which are very sensitive to compositional variation, resulting in varieties of microstructural and crystallographic characteristics.