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 journalArticle

1 Citation (Scopus)

Abstract

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
Volume49
Issue number10
DOIs
Publication statusPublished - 2018 Oct 1

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tearing
Fluidity
mechanical properties
Mechanical properties
tensile strength
Molds
casts
heat treatment
solid solutions
Solid solutions
magnetic permeability
Tensile strength
Aging of materials
Heat treatment
Water
water

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "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.",
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AB - 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.

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