|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||Transformations in TRIP/TWIP Ti Alloys Studied via In-situ Methods
||Fan Sun, Bingnan Qian, Lola Lilensten, Philippe Vermaut, Frédéric Prima
|On-Site Speaker (Planned)
The presentation focuses on the in-situ studies of transformations in TRIP/TWIP Ti alloys including thermally induced omega precipitations. The deformation-induced transformations lead to complex microstructure due to simultaneous activation of various types of twinning and stress-induced martensite. Such active microstructural responses to strain/stress result in important improvements of strain-hardenability and ductility of the alloy. For a better understanding of the mechanisms, the deformation-induced twinning/martensite have to be studied via in-situ EBSD/TEM under mechanical loading because some transformations are reversible. Moreover, the strengthening of TRIP/TWIP Ti alloy via isothermal omega precipitation can be achieved by increasing the CRSSs of the deformation-induced twinning/martensite without suppressing them. Remarkable improvement on tensile strength (470 -> ~900MPa) is obtained without ductility (40%) trade-off on a simple Ti-12Mo. The omega precipitation is investigated by in-situ resistivity measurements and in-situ TEM under heating.
||Phase Transformations, Mechanical Properties, Titanium