Atomic-scale investigation of hydrogen distribution in a TiMo alloy. (15th March 2019)

• Record Type: Journal Article
• Authors: Yan, Fengkai; Mouton, Isabelle; Stephenson, Leigh T.; Breen, Andrew J.; Chang, Yanhong; Ponge, Dirk; Raabe, Dierk; Gault, Baptiste
• Is Part Of: Scripta materialia. Number 162(2019)
• Page Start: 321
• Page End: 325
• Publication Date: 2019-03-15
• Subjects: TiMo alloy -- Hydrogen -- Atom probe tomography -- α and β phases; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.11.040
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Ingress of hydrogen is often linked to catastrophic failure of Ti-alloys. Here, we quantify the hydrogen distribution in fully β and α + β TiMo alloys by using atom probe tomography. Hydrogen does not segregate at grain boundaries in the fully β sample but segregates at some α/β phase boundaries with a composition exceeding 20 at.% in the α + β sample. No stable hydrides were observed in either sample. The hydrogen concentration in β phases linearly decreases from ~13 at. % to ~4 at. % with increasing Mo-content, which is ascribed to the suppression of hydrogen uptake by Mo addition. Graphical abstract: Unlabelled Image