Ω-Assisted α nucleation in a metastable β titanium alloy. (October 2019)

• Record Type: Journal Article
• Authors: Shi, Rongpei; Zheng, Yufeng; Banerjee, Rajarshi; Fraser, Hamish L.; Wang, Yunzhi
• Is Part Of: Scripta materialia. Number 171(2019)
• Page Start: 62
• Page End: 66
• Publication Date: 2019-10
• Subjects: Heterogeneous nucleation -- Interphase interface -- Precipitation -- Phase-field simulation -- High resolution scanning 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.2019.06.020
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We investigate mechanisms of ω-assisted α nucleation for microstructure refinement in a metastable β titanium alloy, Ti-20V (wt%). In particular, we analyze quantitatively the individual and combined effects of concentration and stress fields associated with a growing isothermal ω precipitate and the potency of the ω/β interface on the activation energy barrier for α nucleation as a function of the ω precipitate size and coherency state. We find that the complex interplay among these three factors determines the most potent ω particle size for inducing α nucleation and the most favorable nucleation site. Graphical abstract: Unlabelled Image