期刊
ACTA MATERIALIA
卷 184, 期 -, 页码 199-210出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2019.11.047
关键词
Titanium; HCP; FCC; in situ TEM; APT; FIB
资金
- U.S. Office of Naval Research [N00014-16-1-2304]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Henry Royce Institute [EP/R010145/1]
- EPSRC [EP/M022803/1]
A hexagonal close-packed (HCP) to face-centered cubic (FCC) phase transition has been observed in freestanding alpha-titanium (alpha-Ti) thin foils under two separate conditions: (1) after focused ion beam (FIB) irradiation, and (2) during in situ heating in a transmission electron microscope (TEM). The FCC phase is not found on the Ti single-component equilibrium phase diagram, however, both FCC structures were found to be stable after formation under these conditions. Here, we combine analytical TEM and Atom Probe Tomography (APT) investigations into the chemical nature of these anomalous FCC Ti-X phases. Both occurrences of the FCC phase were observed in thin films containing (initial) prismatic HCP surface plane texturing and appear to be facilitated by hydrogen and oxygen impurities. Our results suggest that the FIB-induced FCC Ti-X is a form of titanium hydride (delta-TiH2 and/or gamma-TiH), while the thermallyinduced FCC Ti-X appears to be tied to the incorporation of oxygen. Published by Elsevier Ltd on behalf of Acta Materialia Inc.
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