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논문 기본 정보

자료유형
학술저널
저자정보
Joon-Young Heo (Inha University) Jin-Han Gwon (KORLOY Inc.) Jong-Kwan Park (Korea Sintered Metal Co. Ltd.) Kee-Ahn Lee (Inha University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.3
발행연도
2018.1
수록면
586 - 596 (11page)

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Hypereutectic Al–Si alloy is an aluminum alloy containing at least 12.6 wt.% Si. It is necessary to evenly control the primarySi particle size and distribution in hypereutectic Al–Si alloy. In order to achieve this, there have been attempts to manufacturehypereutectic Al–Si alloy through a liquid phase sintering. This study investigated the microstructures and high temperaturemechanical properties of hypereutectic Al–14Si–Cu–Mg alloy manufactured by liquid phase sintering process and changesin them after T6 heat treatment. Microstructural observation identifi ed large amounts of small primary Si particles evenlydistributed in the matrix, and small amounts of various precipitation phases were found in grain interiors and grain boundaries. After T6 heat treatment, the primary Si particle size and shape did not change signifi cantly, but the size and distributionof CuAl 2 ( θ ) and AlCuMgSi ( Q ) changed. Hardness tests measured 97.36 HV after sintering and 142.5 HV after heat treatment. Compression tests were performed from room temperature to 300 °C. The results represented that yield strength wasgreater after heat treatment (RT ~ 300 °C: 351 ~ 93 MPa) than after sintering (RT ~ 300 °C: 210 ~ 89 MPa). Fracture surfaceanalysis identifi ed cracks developing mostly along the interface between the primary Si particles and the matrix with somediff erences among temperature conditions. In addition, brittle fracture mode was found after T6 heat treatment.

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