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Vol.41, No.11, 750 ~ 757, 2003
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| Title |
| Mechanical and Corrosion Behaviors of Rheocast and Low-pressure cast A356-T6 Alloy |
| 박철 Park Cheol , 김상식 Kim Sang Sig , 권용남 Kwon Yong Nam , 이영선 Lee Yeong Seon , 이정환 Lee Jeong Hwan |
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| Abstract |
| In the present study, the effect of different processing routes, including rheocasting and low-pressure casting, on the mechanical and corrosion behaviors of A356-T6 alloys was examined. It was found that the tensile elongation and the impact energy value of A356-T6 alloy increased substantially with the rheocasting process compared to the low-pressure cast process, with the sacrifice of yield and tensile strength. The resistance to high cycle fatigue was, however, similar with each other. The observed trends in the mechanical properties with different processing routes appeared to be largely related to the shape and size of silicon particles in the eutectic phase, as well as the volume fraction of primary α phase. The resistance to corrosion in 3.5% NaCl solution was also significantly higher for the rheocast A356-T6 than the low-pressure cast counterpart. The corrosion behavior of A356-T6 with different processing routes was also believed to be related to the area fraction between Si particles and the matrix. |
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| Key Words |
| A356-T6 alloy, Rheocasting, Low-pressure casting, Mechanical behavior, Corrosion behavior |
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