Journal
INTERNATIONAL JOURNAL OF CAST METALS RESEARCH
Volume 33, Issue 2-3, Pages 61-71Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13640461.2020.1746895
Keywords
Al-Si-Cu-Mg cast alloy; solid solution treatment; dissolution; refinement; ultrasonic melt treatment
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Funding
- Ministry of SMEs and Startups [S2317902]
- Korea Technology & Information Promotion Agency for SMEs (TIPA) [S2317902] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 degrees C for 8 hours, while with UST the strength was maximised at 2 similar to 4 hours. The dissolution of the constituent phases upon SST was also discussed.
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