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2020 Vol.30, Issue 2
Microstructure and Tensile Properties in Low Pressure Cast Al-Si Alloy through Cooling Rate Control
Jun-Young Suh1
,
Sung Jin Park2
,
Hee-Kwon Lee3
,
Si Young Chang1†
1Dept. of Materials Engineering, Korea Aerospace University, Goyang 10540, Republic of Korea
2Dept. of Materials Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan
3Dept. of Metallurgy and Materials Engineering, Changwon National University, Changwon 51140, Republic of Korea
†Corresponding author E-Mail : sychang@kau.ac.kr (S. Y. Chang, Korea Aerospace Univ.)
February 2020. pp. 51-56
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Abstract

In this study, three kinds of metal chills such as SS400, AC4CH and brass, with different thicknesses of 40 ~ 80 mm, were applied for low pressure casting of Al-Si alloy to control cooling rate. The microstructural characteristics with increasing cooling rate were represented using factors including D1, D2, size of primary α phases and shape factor and size of eutectic Si. The tensile properties were investigated and additionally analyzed based on the microstructural characteristics. As the cooling rate increased, D1, D2, and sizes of primary α phases and eutectic Si apparently decreased and the shape factor of eutectic Si increased to over 0.8. The ultimate tensile strength (UTS) and yield strength (YS) increased with decreasing D1, D2, and size of primary α phases, while elongation increased with decreasing size of eutectic Si and concurrently increasing shape factor of eutectic Si. This indicated that the primary α phases and eutectic Si in Al-Si alloy were refined with increasing cooling rate, resulting in improvement of UTS and YS without sacrificing elongation. After the tensile test, preferential deformation of primary α phases was observed in the Al-Si alloy produced at higher cooling rates of more than 0.1 K/s.

Keywords
Al-Si alloy
cooling rate
primary α phases
eutectic Si
tensile
deformation
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 30
  • No :2
  • Pages :51-56
  • Received Date : 2019-12-02
  • Revised Date : 2019-12-02
  • Accepted Date : 2020-01-15
  • DOI :https://doi.org/10.3740/MRSK.2020.30.2.51
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