Ultrasonic melt treatment (UST) is known for refining microstructures including intermetallic compound (IMC)s, and it is expected that the microstructural benefits induced by UST may reduce the time and temperature of solid solution treatment (SST). The effect of UST on SST for an Al-7Si-2Cu-1 Mg alloy was investigated in terms of changes of volume fraction of IMCs in connection with the tensile properties. The results show that UST not only refined the constituent phases but also reduced the volume fraction of IMCs in the as-cast microstructure, which promoted dissolution of Cu and Mg rich IMCs during SST, increasing the yield strength of the alloy. In addition, the SST time to achieve maximum strength was shortened by UST. Without UST, the strength was maximised at 520 °C for 8 hours, while with UST the strength was maximised at 2 ~ 4 hours. The dissolution of the constituent phases upon SST was also discussed.
|Number of pages||11|
|Journal||International Journal of Cast Metals Research|
|Publication status||Published - 2020 May 3|
Bibliographical noteFunding Information:
This work was financially supported by the WC300 R&D program [S2317902] funded by the Ministry of SMEs and Startups.
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All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys