Effects of Cu and Si Contents on the Fluidity, Hot Tearing, and Mechanical Properties of Al-Cu-Si Alloys

Byung Keun Kang, Il Sohn

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The effects of the Cu and Si contents on the fluidity, hot tearing, and mechanical properties of Al-Cu-Si alloys were investigated to evaluate the castability of these widely used forged alloys. Al-Cu-Si alloys with 3.5, 4.5, and 5.5 wt pct Cu and 0, 1.5, and 3.0 wt pct Si were cast at 700 °C in spiral and hot tearing test molds to determine the fluidity and hot tearing characteristics, respectively. With a higher Cu content, the fluidity length decreased by 4.9 and 14 pct, but the hot tearing susceptibility increased from 0.44 to 0.56 and 0.67. With a higher Si content at a fixed Cu content of 4.5 wt pct, the fluidity length increased by 11 pct, and hot tearing was not observed. A solid solution heat treatment was performed at 515 °C for 2 hours and at 525 °C for 8 hours, and the alloy was then quenched in water. Artificial aging was carried out at 185 °C for times of 4, 6, 8, and 10 hours. To improve the fluidity and mechanical properties, 0.10 wt pct Ti was added as a grain refiner. The fluidity increased by 4.6 pct, and the tensile strength increased by 339 MPa.

Original languageEnglish
Pages (from-to)5137-5145
Number of pages9
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number10
Publication statusPublished - 2018 Oct 1

Bibliographical note

Funding Information:
This work was sponsored by the Ministry of Trade, Industry and Energy (MOTIE) Project No. 10052751 and the third Stage of Brain Korea 21 Plus Project in 2017 (2017-11-0016)

Publisher Copyright:
© 2018, The Minerals, Metals & Materials Society and ASM International.

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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