Synergistic precipitation reactions in a novel high-temperature Ti-alloy
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In: Scripta materialia, Vol. 259.2025, No. 1 April, 116543, 09.01.2025.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - Synergistic precipitation reactions in a novel high-temperature Ti-alloy
AU - Farabi, Ehsan
AU - He, Xinyi
AU - Obersteiner, David
AU - Musi, Michael
AU - Neves, José
AU - Klein, Thomas
AU - Primig, Sophie
PY - 2025/1/9
Y1 - 2025/1/9
N2 - There is a pressing need for the development of new Ti-alloys tailored to wire-based directed energy deposition (waDED), to enable the wider uptake of this additive manufacturing process by the aerospace and energy industries. Here we present a novel high-temperature Ti-alloy for waDED. Our alloy design aims to exploit phase transformations and precipitation to achieve fine and homogeneous microstructures during processing and to provide improved high-temperature mechanical properties. Our new alloy design features combined additions of Si, Cu, Nb, and Y. We study its microstructural evolution during a simulated waDED solidification route and after various heat-treatments replicating the waDED thermal history in a deposited layer. Our alloy shows significant potential for the formation of fine and equiaxed β grains during waDED. Atom probe and transmission electron microscopy reveal the formation of nm-sized Ti2Cu, (Ti, Zr)6Si3 and sandwich-like Y-Cu dispersoids that are known to improve high-temperature properties in Ti-alloys.
AB - There is a pressing need for the development of new Ti-alloys tailored to wire-based directed energy deposition (waDED), to enable the wider uptake of this additive manufacturing process by the aerospace and energy industries. Here we present a novel high-temperature Ti-alloy for waDED. Our alloy design aims to exploit phase transformations and precipitation to achieve fine and homogeneous microstructures during processing and to provide improved high-temperature mechanical properties. Our new alloy design features combined additions of Si, Cu, Nb, and Y. We study its microstructural evolution during a simulated waDED solidification route and after various heat-treatments replicating the waDED thermal history in a deposited layer. Our alloy shows significant potential for the formation of fine and equiaxed β grains during waDED. Atom probe and transmission electron microscopy reveal the formation of nm-sized Ti2Cu, (Ti, Zr)6Si3 and sandwich-like Y-Cu dispersoids that are known to improve high-temperature properties in Ti-alloys.
U2 - 10.1016/j.scriptamat.2025.116543
DO - 10.1016/j.scriptamat.2025.116543
M3 - Article
VL - 259.2025
JO - Scripta materialia
JF - Scripta materialia
SN - 1359-6462
IS - 1 April
M1 - 116543
ER -