High-strength ultrafine-grained titanium-based alloys with large plasticity
Nova Science Publishers
Faculty of Health, Engineering and Science
School of Engineering
In order to simultaneously enhance the strength and plasticity in nanostructured / ultrafine-grained alloys, a strategyof formation of multiple length-scale microstructure (or called bimodal composite microstructure) has been developed recently. This chapter gives a brief overview of the alloy development, microsctructure properties relationship, and deformation behavior innanostructured / ultrafine-grained Ti-Fe-based alloys obtained through a simple single-step solidification process. In geneal, different lengthscale phases, i.e. micrometer-sized primary phases (dendrites or eutectic) embedded in an nanostructured / ultrafine-grained eutectic matrix, are formed in the as-cast Ti-Fe-based alloy systems. These as-prepared nanostructured / ultrafine-grained Ti-Fe-based materials exhibit an excellent combination of strength and plasiticity, i.e. high strength of exceeding 2000 MPa, large plasticity up to 20% and high specific strength. The relationship between microstructural charactersitcsand the mechanical behavior and plastic deformation behavior in the nanostructured / ultrafine-grained Ti-Fe-based alloys have been detailed discussed.