TY - JOUR
T1 - Oxidation Behavior of Germanium- and/or Silicon-Bearing Near-α Titanium Alloys in Air
AU - Kitashima, Tomonori
AU - Yamabe-Mitarai, Yoko
N1 - Publisher Copyright:
© 2015, The Minerals, Metals & Materials Society and ASM International.
Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 2015/6/1
Y1 - 2015/6/1
N2 - The effect of germanium (Ge) and/or silicon (Si) addition on the oxidation behavior of the near-α alloy Ti-5Al-2Sn-4Zr-2Mo was investigated in air at 973 K (700 °C). Ge addition decreased the oxidation resistance because of the formation of a Ge-rich layer in the substrate at the TiO2/substrate interface, enhancing Sn segregation at the interface. In addition, a small amount of Ge dissolved in the external Al2O3 layer. These results reduced the aluminum activity at the interface, suppressed the formation of Al2O3, and increased the diffusivity of oxygen in the oxide scales. The addition of 0.2 and 0.9 wt pct Si was beneficial for improving oxidation resistance. The effect of germanide and silicide precipitates in the matrix on the oxide growth process was also discussed.
AB - The effect of germanium (Ge) and/or silicon (Si) addition on the oxidation behavior of the near-α alloy Ti-5Al-2Sn-4Zr-2Mo was investigated in air at 973 K (700 °C). Ge addition decreased the oxidation resistance because of the formation of a Ge-rich layer in the substrate at the TiO2/substrate interface, enhancing Sn segregation at the interface. In addition, a small amount of Ge dissolved in the external Al2O3 layer. These results reduced the aluminum activity at the interface, suppressed the formation of Al2O3, and increased the diffusivity of oxygen in the oxide scales. The addition of 0.2 and 0.9 wt pct Si was beneficial for improving oxidation resistance. The effect of germanide and silicide precipitates in the matrix on the oxide growth process was also discussed.
UR - http://www.scopus.com/inward/record.url?scp=84940006487&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84940006487&partnerID=8YFLogxK
U2 - 10.1007/s11661-015-2835-2
DO - 10.1007/s11661-015-2835-2
M3 - Article
AN - SCOPUS:84940006487
VL - 46
SP - 2758
EP - 2767
JO - Metallurgical Transactions A (Physical Metallurgy and Materials Science)
JF - Metallurgical Transactions A (Physical Metallurgy and Materials Science)
SN - 1073-5623
IS - 6
ER -