| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
Mechanical Properties Optimization via Microstructural Control of a Metastable β-type Ti-Nb Gum Metal |
| Author(s) |
Sumin Shin, Kenneth S. Vecchio |
| On-Site Speaker (Planned) |
Kenneth S. Vecchio |
| Abstract Scope |
Microstructure design approaches, leading to twinning-induced plasticity effect through twinned structures and hetero-deformation induced hardening associated with heterogeneous structure (HS), are investigated in this study to tune deformation behavior and correlated mechanical properties in Gum Metal (Ti-23Nb-0.7Ta-2Zr-1.3O at%). The pre-twinned Gum Metal exhibits a pronounced improvement in uniform elongation and work hardening rate, but a lower yield strength with increasing a twin fraction in the microstructure. The experimental results demonstrate that intentional introduced twins are strongly related to the overall softening behavior, and enhanced uniform ductility, attributed to well-distributed twins based on the ‘composite effect’. An intentional heterogeneous structure was accompanied by controlling fraction coarse/fine domains, a spatial grain-size distribution and different types of grain boundaries. The large microstructural heterogeneity leads to obvious mechanical incompatibility and strain partitioning, which, additionally, contributes to induced back-stress hardening and promotes strain delocalization, thereby achieving an exceptional strength-ductility synergy in this Ti-Nb Gum Metal. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |