Characterization of a previously unidentified ordered orthorhombic metastable phase in Ti-5Al-5Mo-5V-3Cr. (1st March 2016)

• Record Type: Journal Article
• Authors: Zheng, Yufeng; Williams, Robert E.A.; Fraser, Hamish L.
• Is Part Of: Scripta materialia. Volume 113(2016)
• Page Start: 202
• Page End: 205
• Publication Date: 2016-03-01
• Subjects: Titanium alloys -- Phase transformations -- Ordering -- High-resolution electron microscopy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.10.037
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A previously unidentified, nanometer scale ordered precipitate has been characterized in the metastable β titanium alloy Ti-5Al-5Mo-5V-3Cr (Ti-5553) using conventional transmission electron microscopy (TEM) and high-angle annular dark field (HAADF) high-resolution scanning transmission electron microscopy (HRSTEM). The phase, termed Oʺ, is metastable, the ordering transformation occurring over an intermediate temperature range (e.g., 375 °C), and this ordered face centered orthorhombic precipitate may be observed co-existing with isothermal ω and α phases in the alloy. It is also noted that this transient phase may provide the diffracted intensities observed from another phase, identified tentatively in the literature as orthorhombic martensite, αʺ [1]. Graphical abstract: