About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
Presentation Title |
The Significant Impact of Grain Refiner on Additively Manufactured TiAl Intermetallic Alloy |
Author(s) |
Danni Huang, Mingxing Zhang, Ming Yan |
On-Site Speaker (Planned) |
Danni Huang |
Abstract Scope |
TiAl intermetallic alloy is emerging as a significant engineering material in high temperature applications due to its high strength and good corrosion, creep and oxidation resistance at elevated temperature. Additive manufacturing (AM) has been considered as a powerful tool to fabricate TiAl intermetallic alloy. However, intermetallic TiAl alloy due to its intrinsic brittleness could not accommodate the high thermal stress generated by fast cooling rate and high thermal gradient during AM process, resulting in distortion and cracking. In our study, grain refinement technology was integrated to additive manufacturing of a Ti-44Al-4Nb-1Mo-1Cr (in at.%) intermetallic alloy to improve its AM processability. Crack-free and fine-grained samples could be successfully fabricated through grain refinement. The compressive yield strength, compressive strength and strain are simultaneously increased by 29%, 12.4% and 61.9% respectively. The mechanical performance of this modified alloy is comparable or even better than those produced by conventional technologies. |