Revisiting ω phase embrittlement in metastable β titanium alloys: Role of elemental partitioning. (1st March 2021)

• Record Type: Journal Article
• Authors: Lai, M.J.; Li, T.; Yan, F.K.; Li, J.S.; Raabe, D.
• Is Part Of: Scripta materialia. Number 193(2021)
• Page Start: 38
• Page End: 42
• Publication Date: 2021-03-01
• Subjects: Titanium alloys -- ω phase -- Embrittlement -- Atom probe tomography -- Transmission electron microscopy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.10.031
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The role of elemental partitioning between β and ω phase in embrittling an originally ductile ω-containing Ti–12Mo (wt.%) model alloy was studied using transmission electron microscopy and atom probe tomography. It is revealed that the embrittlement of this alloy already occurs after aging at 400 °C for as short as 10 min, when the size, inter-particle spacing and volume fraction of the ω particles remain almost unchanged. The origin of the aging-induced embrittlement is attributed to the significant rejection of Mo (>5 at.%) from the ω particles during aging, which leads to remarkable increase in the shear modulus (>30 GPa) of the ω particles, promoting intense plastic flow localization and facilitating crack nucleation prior to macroscopic yielding. Graphical abstract: Image, graphical abstract