Effect of boron microalloying on microstructure, tensile properties and creep behavior of Ti-22Al-20Nb-2W alloy

Citation
F. Tang et al., Effect of boron microalloying on microstructure, tensile properties and creep behavior of Ti-22Al-20Nb-2W alloy, MAT SCI E A, 315(1-2), 2001, pp. 147-152
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN journal
0921-5093 → ACNP
Volume
315
Issue
1-2
Year of publication
2001
Pages
147 - 152
Database
ISI
SICI code
0921-5093(20010930)315:1-2<147:EOBMOM>2.0.ZU;2-F
Abstract
The effect of 0.2 at.% boron addition on the microstructure, tensile proper ties, and creep behavior of Ti-22Al-20Nb-2W were investigated. A TiB phase was observed in the B-doped alloy, which shows that the solubility of boron in this alloy is very low. The addition of 0.2 at.% boron was very effecti ve in reducing the prior beta -grain size of the Ti-22Al-20Nb-2W alloy, whi ch is thought to be due to a strong boron segregation at the grain boundari es. The decrease in grain size due to the addition of boron is effective in improving the alloy's room temperature ductility. The addition of a small amount of boron was beneficial in lowering the steady-state creep rate at 6 50 degreesC/310 MPa, but did not improve the creep behavior at 750 degreesC /310 MPa. (C) 2001 Elsevier Science B.V. All rights reserved.