한국주조공학회지 (Journal of Korea Foundry Society)
- 제17권4호
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- Pages.365-370
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- 1997
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- 1598-706X(pISSN)
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- 2288-8381(eISSN)
과공정 Al-Si합금의 열팽창거동과 기계적 성질에 미치는 미세조직의 영향
Effects of Microstructure on the Thermal Expansion Behavior and Mechanical Properties of the Hypereutectic Al-Si Alloy
- Park, Chong-Sung (Department of Metallurgical Engineering, Inha University, RASOM) ;
- Lee, Jeong-Keun (Department of Metallurgical Engineering, Inha University, RASOM) ;
- Kim, Myung-Ho (Department of Metallurgical Engineering, Inha University, RASOM)
- 발행 : 1997.08.20
초록
The effects of changes in microstructure of Si phase on the thermal expansion coefficients(CTEs) and tensile properties of the hypereutectic Al-Si foundry alloy(A390) were investigated experimentally. Specimens were prepared by various fabrication processes, such as a permanent mold casting, a squeeze casting and a spray casting process, and subsequently hot-extruded. CTEs of the spray-cast specimen were found to be about 10% lower than those of the permanent mold-cast specimen, and the CTEs of the hypereutectic Al-Si alloy(A390) were changed proportionally with the size of Si phase. Ultimate tensile strength of the spray-cast and hot-extruded specimen was dramatically improved about 100% with improved elongation, compared to that of permanent mold-cast specimen. These improvements are mainly attributed to the reduction in size and aspect ratio of the brittle Si phase, and the elimination of the microvoids/porosities formed during casting.
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