Description
This study presents a novel high-temperature Ti-alloy designed for wire-based directed energy deposition (waDED) processes for various applications in the aerospace and energy industries. While high-strength Ti-alloys for waDED have been extensively researched, high-temperature variants are yet to be designed, even though aerospace and energy components commonly operate at elevated temperatures. Current waDED techniques often introduce significant heterogeneity and anisotropy in mechanical properties, as seen in existing alloys like Ti-6Al-2Sn-4Zr-2Mo. Our novel alloy combines additions of Si, Cu, Nb, and Y. It seeks to improve high-temperature performance by leveraging phase transformations and precipitation to achieve fine, homogeneous microstructures during additive manufacturing. We investigate the microstructural evolution during simulated waDED solidification and various heat treatments associated with cyclic reheating. Our developed alloy exhibits refined, equiaxed β grains post-heat treatment. Y inhibits β grain growth, transforming the microstructure from a fine lath-like colony α-phase to a coarse lamellar structure. High-resolution atom probe microscopy reveals very fine (15–20 nm) core-shell Ti2Cu precipitates with Y cores, significantly enhancing mechanical performance despite microstructure coarsening during the heat treatment. Our developed alloy shows substantial promise for high-deposition-rate waDED processes, offering improved high-temperature capabilities.| Period | 4 Dec 2024 → 6 Dec 2024 |
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| Event title | CAMS2024 - Advancing Materials and Manufacturing |
| Event type | Conference |
| Location | Adelaide, Australia, South AustraliaShow on map |
| Degree of Recognition | International |
Research Field
- Wire-Based Additive Manufacturing