Communication Dans Un Congrès Année : 2020

Design and development of a dual-phase TRIP-TWIP alloy for enhanced mechanical properties

Résumé

Triggering transformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) mechanisms in metastable β titanium alloys (bcc, body centered cubic) have helped reaching unprecedented mechanical properties for Ti-alloys, including high ductility and work-hardening. Yet the yield strength of such alloys generally remains rather low. So far, mostly single-phase metastable bcc alloys have been developed. In this study, a dual phase TRIP/TWIP alloy is designed and investigated. While the β-matrix is expected to display TRIP/TWIP deformation mechanisms, the addition of a second phase, α in the present study, aims at increasing the yield strength. The composition was designed in the Ti-Cr-Sn system, based on Calphad prediction and on the semi-empirical d -electron alloy design approach. Results were compared to the published full β Ti – 8.5Cr – 1.5Sn (wt%) TRIP/TWIP alloy. The dual-phase alloy was prepared and processed to reach the desired microstructure containing about 20% α. It displays remarkable mechanical properties such as a ductility of 29%, an ultimate tensile strength of 1200 MPa and a yield strength of 760 MPa, 200MPa higher than the Reference single-phase β alloy. Analysis of the mechanical properties and deformation microstructures confirm the TRIP and TWIP effects, validating the proposed approach.

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Dates et versions

hal-04277310 , version 1 (09-11-2023)

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Lola Lilensten, Yolaine Danard, Fan Sun, Philippe Vermaut, Loïc Perrière, et al.. Design and development of a dual-phase TRIP-TWIP alloy for enhanced mechanical properties. TITANIUM 2019 – 14TH WORLD CONFERENCE ON TITANIUM, Jun 2019, Nantes, France. pp.11014, ⟨10.1051/matecconf/202032111014⟩. ⟨hal-04277310⟩
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