| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Advances in Surface Engineering
|
| Presentation Title |
Mechanical Ball Milling of Gas Atomized Ti‒48Al‒2Cr‒2Nb Powder for Preventing Smoking in Electron Beam Additive Manufacturing Process |
| Author(s) |
SeungKyun Yim, Huakang Bian, Keiji Yanagihara, Kenta Aoyagi, Akihiko Chiba |
| On-Site Speaker (Planned) |
SeungKyun Yim |
| Abstract Scope |
In recent years, dense TiAl parts have been fabricated via electron beam additive manufacturing (EBAM) technology. However, one problem to apply EBAM for producing TiAl parts is sudden powder spreading, also known as “smoking”. One main reason is that the gas atomized TiAl powder is encapsulated by an electrically insulating oxide layer acting as a capacitor, which inhibits the charge redistribution across particle contacts. In the present study, the ball milling treatment is carried out to manipulate the powder surface of Ti‒48Al‒2Cr‒2Nb alloy to prevent smoking in the EBAM process. The electrical properties of ball milling powders are investigated by impedance spectroscopy with the corresponding electrical circuit fitting. The oxide layers of both raw and ball milling powders are characterized using X-ray photoelectron spectroscopy and transmission electron microscopy. |