|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Ultrafine-grained and Heterostructured Materials (UFGH XII)
||Ultra-high Strength and Ductility of a Multiple Component Alloy with a Heterogeneous Microstructure of Grains and Precipitates
||Weitong Wang, Shengyun Yuan, Yong Zhang
|On-Site Speaker (Planned)
In the present study, a heterogeneous microstructure characterized by a mixture of nano-grains and ultrafine-grains embedded with γ’ precipitates is fabricated by cold rolling a coarse-grained Ni-Co-Cr alloy and subsequent thermal annealing. The sample with heterogeneous microstructure exhibits simultaneously higher strength and larger uniform elongation compared with the original alloy without cold rolling. Electron backscatter diffraction, transmission electron microscopy, energy dispersive X-Ray spectroscopy, and atom probe tomography are performed to investigate the microstructural evolution of the heterogeneous structure tensile loaded to various strains, with an emphasis on the evolution of defects around the interface between nano-grains and ultrafine-grains. With a thorough comparison with the original coarse-grained sample on the deformation mechanisms, the effect of the complexity of the heterogenous microstructure on the evolution of dislocation density and deformation mechanism is illustrated, which serves to reveal the mechanisms responsible the work hardening and ductility.