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Vol.32, No.10, 1259 ~ 1269, 1994
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| Title |
| Microstructures and Mechanical Properties of Squeeze cast |
| 이정일 , 한소섭 , 이호인 , 김문일 Jung Ill Lee , Yo Sub Han , Ho In Lee , Moon Il Kim |
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| Abstract |
| The squeeze casting process is well known to yield superior cast products to those from gravity casting. New alloy systems of Al-Si-Cu-Mg which possess good castability and excellent mechanical properties have been examined to optimize cast alloy compositions. The alloy composition of Al-12wt%Si-3wt%Cu-0.7wt%Mg with and without Sr, Ti and B modifier was investigated in this study using brinell hardness, tensile strength and elongation. Tensile strength of 39 to 41 ㎏/㎟ and elongation of 1.7% to 2.5% was obtained from this squeeze cast alloy under T6 heat treament condition. These properties represent 10∼20% improvement over those from gravity cast products. Modification with Sr, Ti and B on this alloy resulted in 40% increase of elongation, although no significant change in wear resistance was found. Compared to AC8A and AC4CH alloys, Wear losses of this newly designed Al-Si-Cu-Mg alloy were reduced to 1/2 to 1/3, Abrasive wear tracks were mainly observed in this alloy, whereas both abrasive and adhesive wear tracks were found in conventional cast alloys. |
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