The role of ω in the precipitation of α in near-β Ti alloys. (May 2016)

• Record Type: Journal Article
• Authors: Li, Tong; Kent, Damon; Sha, Gang; Cairney, Julie M.; Dargusch, Matthew S.
• Is Part Of: Scripta materialia. Volume 117(2016)
• Page Start: 92
• Page End: 95
• Publication Date: 2016-05
• Subjects: Titanium alloy -- Phase transformations -- Atom probe tomography -- HREM; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.02.026
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: To identify the conditions under which ɷ assists α formation in a near-β Ti alloy, we employed transmission electron microscopy and atom probe tomography to study α precipitation in alloys designed to contain two different types of ɷ. Coherent incommensurate embryonic ɷ formed upon isothermal ageing, does not directly assist α precipitation. When this incommensurate embryonic ɷ grows to a critical size, it transforms into commensurate isothermal ɷ, during which stress is thought to be the dominant factor. Regions of O enrichment at the semi-coherent isothermal ɷ/β interfaces are observed, which is thought to promote α formation. Graphical abstract: