|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced High-strength Steels
||Phase Transition Enhanced Ductility in a Superstrong Nanostructured Ferrous Alloy
||Weitong Lin, Linke Huang, Feng Liu
|On-Site Speaker (Planned)
In the material science, phase transitions are found effective in modulating the microstructures and mechanical properties. Recent successful examples could be found from steel and Ti-based alloys to amorphous alloys and high-entropy alloys. However, in nanostructured alloys, phase transitions are conventionally considered as triggering for inducing the loss of nanocrystallity, resulting in an underestimation of their significance in fabricating the nanostructured materials. Here, we allow partial loss of nanocrystallity by utilizing the occurrence of (α to γ) phase transition and grain growth in nanostructured Fe alloys to produce a new kind of heterogeneous and hierarchical microstructure, i.e. dual-phase bimodal nanoostructure (DPBN). Unprecedented strength accompanied by a considerable ductility, are achieved in DPBN-Fe alloys by virtue of the advantages arising from dual phase and bimodal nanostructure, where high strength imparted by nanostructured ferrite matrix with oxide dispersion strengthening and high compressive ductility imparted by ultrafine austenite with transformation-induced hardening.
||Planned: Supplemental Proceedings volume