Abstract
The implementation of the well-known methods for grain refinement of cast TiAl alloys, such as boron refiner, leads to compositional pollution and deterioration of specific types of performances. The development of pollution-free grain refinement methods is of crucial importance in aviation industries. Along these lines, in this work, a pollution-free grain refinement method was developed using the vacuum mechanical vibration (VMV) solidification technique. More specifically, a significant microstructure refinement of a typical Ti–48Al–2Cr–2Nb alloy was achieved, with the average grain size refined from the initial value of 141 μm–72 μm. As a result, the yield strength and compressive strength were both increased, almost without the sacrifice of the peak strain, which nearly overcome the strength-ductility trade-off with simple processing.
Original language | English |
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Article number | 144630 |
Journal | Materials Science and Engineering: A |
Volume | 865 |
DOIs | |
Publication status | Published - 16 Feb 2023 |
Externally published | Yes |
Keywords
- Grain refinement
- Mechanical property
- Microstructure
- TiAl alloy
- Vacuum mechanical vibration