Abstract
The solidification structure applying a novel low-voltage alternating current pulse (ACP) during solidification of Al-7Si-0.52Mg alloy has been investigated. The results indicated that the grain density increased with increasing current density. A remarkable refinement of grain occurred, and the microstructure of primary α-Al phase transforms from developed dendrites to fine rosette equiaxed grain when the current density was more than 230 Acm-2. The grain refinement was mainly achieved during the nucleation stage rather than the stage of liquid inoculation and dendrite growth. It was concluded that the grain refinement under ACP during nucleation stage was due to the enhancement of nucleation rate induced by an additional electric potential energy.
| Original language | English |
|---|---|
| Pages (from-to) | 1431-1435 |
| Number of pages | 5 |
| Journal | Advanced Materials Research |
| Volume | 482-484 |
| DOIs | |
| State | Published - 2012 |
| Event | 3rd international Conference on Manufacturing Science and Engineering, ICMSE 2012 - Xiamen, China Duration: 27 Mar 2012 → 29 Mar 2012 |
Keywords
- Electric potential energy
- Grain refinement
- Low-voltage alternating current pulse
- Nucleation stage
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