Fine-tuning of stress-induced martensite in TRIP/TWIP Ti alloys

MATEC Web of Conferences

VERMAUT Philippe¹  SUN Fan²  PRIMA Frédéric²  QIAN Bingnan² 

[1] ;PSL Research University, Chimie ParisTech–CNRS, Institut de Recherche de Chimie Paris;

关键词: trip/twip ti alloys;    in-situ ebsd;    stress-induced martensitic transformation;    mechanical twinning;    β metastable alloys;   

DOI  :  10.1051/matecconf/202032111038

来源: DOAJ

【 摘 要 】

Fine-tuning of stress-induced martensitic (SIM) transformation was studied in Ti-Mo based β metastable alloys, showing combined Transformation Induced Plasticity (TRIP) and Twinning Induced Plasticity effects (TWIP) effects. The work aimed to clarify the transition and interaction between the two deformation mechanisms and their influences on the mechanical properties of Ti-Mo based alloys. Electron parameter design methods (Bo-Md and e/a ratio) were cross-used to increase the β phase stability from near-TRIP to near-TWIP by adding third alloying elements. SIM α″ transformation and mechanical twinning were traced by in-situ EBSD (Electron backscatter diffraction) mapping under cyclic tension. The deformation modes of β phase exhibited significant changes when shifting its metastability via chemical composition modifications. In near-TRIP conditions (dominated by the growth of SIM α″ in plastic regime), SIM α″ transformation and internal twinning of martensite were the main mechanisms to accommodate the local stress-strain conditions. In near-TWIP ones (dominated by the growth of {332}<113>β twinning in plastic regime), SIM α″ was observed only at twinning interface during strain process and disappeared after stress release.

【 授权许可】

Unknown