| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Light Metal Technology
|
| Presentation Title |
Evolution of Spheroidal α-AlFeSi Phase in 1200 Aluminum by 3D Visualization Using FIB-SEM |
| Author(s) |
Mami Mihara Mihara Narita, Hisashi Sato, Yoshimi Watanabe, Tetsuya Motoi, Hideo Yoshida |
| On-Site Speaker (Planned) |
Mami Mihara Mihara Narita |
| Abstract Scope |
Spheroidal α-AlFeSi phase is one of the intermetallic compounds formed in aluminum alloys. Previous study found that α-AlFeSi crystallizes on the inner walls of hydrogen bubbles generated during the solidification of aluminum. In this study, to investigate its nucleation and growth mechanism, 1200 aluminum with different cooling rates from solidification temperature were fabricated using potatoes as a hydrogen introduction. The formation of voids caused by hydrogen were confirmed, and the size of the voids was larger in the air-cooled sample (AC) than in the water-cooled sample (WQ). In the WQ, the amount of α-AlFeSi formed was small, and its diameter was about 1.5 μm. In AC sample, the diameter of α-AlFeSi increased to about 6 μm. Furthermore, holding at 630 ℃ followed by air-cooling increased the diameter of α-AlFeSi to about 20 μm. Based on the 3D structure image, the growth of α-AlFeSi inside of gas bubbles was confirmed. |