| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1647795 | Materials Letters | 2012 | 4 Pages |
The evolution of porosity during re-melting of near-eutectic casting Al alloys has been investigated in-situ using X-ray micro-focus radiography. During re-melting process, gas bubbles float out of the melt quickly when the liquid melt interface passes through them. Based on the degassing phenomenon from the real-time observation, several re-melting experiments were carried out with pure aluminum and a hypoeutectic Al-7%Si-0.4%Mg (A356) in addition to the near-eutectic Al-13%Si alloys. The results clearly show that the area fraction of porosity in the final Al castings decreases dramatically after re-melting one or two times, of which the mechanism is discussed in this paper.
► Evolution of porosity during re-melting of Al alloys has been investigated. ► Gas bubbles float out of the melt quickly during re-melting process. ► Area fraction of porosity in Al castings decreases dramatically after re-melting. ► Re-melting process has been developed for degassing in aluminum alloys.
