Metallurgical and Materials Transactions A

, Volume 49, Issue 10, pp 5137–5145 | Cite as

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

  • Byung Keun Kang
  • Il SohnEmail author


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.



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)


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© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringYonsei UniversitySeodaemun-guRepublic of Korea

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