The crystallographic features of τ3 phase in a powder metallurgy nickel-doped Ti-45Al-5Nb-0.2C-0.2B-1.25Ni alloy

Xia, Y., Qiu, D. and Qian, M. (2016) The crystallographic features of τ3 phase in a powder metallurgy nickel-doped Ti-45Al-5Nb-0.2C-0.2B-1.25Ni alloy. Intermetallics, 71 65-72. doi:10.1016/j.intermet.2015.12.014


Author Xia, Y.
Qiu, D.
Qian, M.
Title The crystallographic features of τ3 phase in a powder metallurgy nickel-doped Ti-45Al-5Nb-0.2C-0.2B-1.25Ni alloy
Journal name Intermetallics   Check publisher's open access policy
ISSN 0966-9795
1879-0216
Publication date 2016-04-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.intermet.2015.12.014
Volume 71
Start page 65
End page 72
Total pages 8
Place of publication London, United Kingdom
Publisher Elsevier
Collection year 2017
Language eng
Formatted abstract
Nickel (Ni) improves the room temperature ductility, hot workability and sinterability of γ-TiAl based alloys. This study investigates the microstructure of a powder metallurgy nickel-doped Ti-45Al-5Nb-0.2C-0.2B-1.25Ni alloy based on detailed transmission electron microscopy (TEM) studies. The alloy was sintered at 1375 °C for 120 min, followed by cooling to 900 °C for a subsequent ageing treatment of 360 min. Micrometric τ3-Al3NiTi2 particles formed as a result of the solidification of a Ni-containing sintering liquid during subsequent cooling. Ageing of the as-sintered Ti-45Al-5Nb-0.2C-0.2B-1.25Ni alloy at 900 °C resulted in the precipitation of both plate-shaped and lath-shaped nanometric τ3 phase in the α2 lamellae. The constrained coincidence site lattice (CCSL) theory was used to understand the morphology and crystallography of the nanoscale τ3-Al3NiTi2 precipitates. The compression yield strength of the Ti-45Al-5Nb-0.2C-0.2B-1.25Ni alloy increased from 750 ± 20 MPa to 850 ± 20 MPa after ageing.
Keyword Microstructure
Powder metallurgy
Sintering
Titanium alloys
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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