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Vol.52, No.11, 923 ~ 930, 2014
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| Title |
| Review Paper : Effects of Eutectic Si and Secondary Dendrite Arm Spacing on the Mechanical Properties of Al-Si-Cu Cast Alloys |
| 이경민 Kyung Min Lee , 최세원 Se Weon Choi , 김영찬 Young Chan Kim , 김유미 Yu Mi Kim , 강창석 Chang Seok Kang , 김영만 Young Man Kim , 홍성길 Sung Kil Hong |
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| Abstract |
| The present study aims at investigating the effects of eutectic Si and Secondary dendrite arm spacing (SDAS) on mechanical properties of Al-Si-Cu alloy. Heat treatment and controlling of solidification rate affect to microstructure of Al-Si-Cu alloy. Al-Si-Cu alloy was dissolved in an electric furnace. The alloy cast in STD61 mold which had been pre-heated to 95 ℃ and 200 ℃. Eutectic Si and SDAS were finer as cooling rate increased. Image analysis technique has been utilized to examine the microstructure. Micros- tructure observation results showed that T6 heat treatment has a strong influence eutectic Si particle morphology. The mechanical properties, such as tensile strength, yield strength, elongation, were improved by ASTM E8 standard. Tensile properties of the Al-Si-Cu alloys prepared by different cooling rates were the same as each other by T6 heat treatment. (Received December 19, 2013) |
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| Key Words |
| alloy, solidification, microstructure, image analysis, Si morphology |
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