Demonstrating a duplex TRIP/TWIP titanium alloy via the introduction of metastable retained β-phase. Issue 11 (2nd November 2022)

• Record Type: Journal Article
• Authors: Sesha, Karri Sri Naga; Yamanaka, Kenta; Mori, Manami; Onuki, Yusuke; Sato, Shigeo; Fabrègue, Damien; Chiba, Akihiko
• Is Part Of: Materials research letters. Volume 10:Issue 11(2022)
• Page Start: 754
• Page End: 761
• Publication Date: 2022-11-02
• Subjects: Titanium alloy -- Martensitic transformation -- TRIP/TWIP -- Work hardening; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2022.2096419
• Languages: English
• ISSNs: 2166-3831

Abstract

Abstract : This study demonstrates transformation-induced plasticity (TRIP) in conjunction with twinning-induced plasticity (TWIP) in α + β titanium alloys by introducing metastable retained β-phase. By annealing at 850 °C followed by water quenching, metastable retained β-phase (∼25%) was obtained in Ti–6Al–4V alloy. Stress-induced phase transformation in the retained β-phase produced orthorhombic α′′-martensite associated with (021)α ′′ twinning, which significantly increased the work-hardening rate and uniform elongation. The findings reveal that the minor retained β-phase is responsible for macroscopic deformation behavior and could aid in novel alloy design that can increase work hardenability with fewer alloying elements than currently available metastable β-titanium alloys. GRAPHICAL ABSTRACT: UF0001 IMPACT STATEMENT: The minor metastable retained β-phase in an α + β titanium alloy with low alloy content enhanced work hardening because of the combined TRIP/TWIP effect.