A transmission electron microscopy and three-dimensional atom probe study of the oxygen-induced fine microstructural features in as-sintered Ti-6Al-4V and their impacts on ductility

Yan, M., Dargusch, M. S., Ebel, T. and Qian, M. (2014) A transmission electron microscopy and three-dimensional atom probe study of the oxygen-induced fine microstructural features in as-sintered Ti-6Al-4V and their impacts on ductility. Acta Materialia, 68 15: 196-206. doi:10.1016/j.actamat.2014.01.015


Author Yan, M.
Dargusch, M. S.
Ebel, T.
Qian, M.
Title A transmission electron microscopy and three-dimensional atom probe study of the oxygen-induced fine microstructural features in as-sintered Ti-6Al-4V and their impacts on ductility
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
1873-2453
Publication date 2014-04-15
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.actamat.2014.01.015
Open Access Status Not yet assessed
Volume 68
Issue 15
Start page 196
End page 206
Total pages 11
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Subject 2503 Ceramics and Composites
2506 Metals and Alloys
2507 Polymers and Plastics
2504 Electronic, Optical and Magnetic Materials
Abstract Recent systematic experimental studies involving the benchmark Ti-6Al-4V alloy fabricated from powder have established that there exists a critical level of oxygen around 0.33 mass%, beyond which the tensile ductility of the alloy drops dramatically until reaching total brittleness. To understand the fundamental mechanisms behind this critical oxygen content, three-dimensional atom probe tomography, transmission electron microscopy and other analytical means have been used to identify and characterize the fine microstructural changes induced by the increased oxygen content beyond the critical level. Three fine microstructural features were identified in as-sintered Ti-6Al-4V when the interstitial oxygen content was increased from 0.25 mass% to 0.49 mass%. These are: (i) the formation of fine acicular α precipitates in the β phase; (ii) the formation of α2-type (Ti3Al) nanometric clusters in the α matrix; and (iii) grain boundary α-β-α-layered structures between the α grains. The impacts of these microstructural changes on the tensile ductility are discussed.
Keyword Atom probe tomography
Oxygen
Titanium alloys
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 22 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 28 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Tue, 11 Mar 2014, 10:15:50 EST by System User on behalf of School of Mechanical and Mining Engineering