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- 저자 : Nathalie Limodin (검색결과 1 건)
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Zaidao Li,Nathalie Limodin,Amina Tandjaoui,Philippe Quaegebeur,Xiangzhen Zhu,David Balloy 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
The present study was performed on two AlSi7Cu3 alloys with different Fe and Mn contents (standard alloy and high-Fe/Mnalloy). The evolution of microstructures during solidification of the standard AlSi7Cu3 alloy was investigated by thermalanalysis and interrupted quenching test. The effect of Fe and Mn content on the solidification reaction and sequence werestudied. The results show that increasing the Fe and Mn content changes the precipitation sequence of the iron-intermetallicα-Al15 (Fe,Mn)3Si2 and β-Al5FeSi, leading to the precipitation of α + β phases at a higher temperature. Microstructural characterizationswere also performed on the fully solidified alloys to study the effect of Fe and Mn content on the microstructureof AlSi7Cu3 alloy. Fe and Mn were found to promote the formation of Fe-intermetallics. With the increase of Fe/Mn content,Fe-intermetallics increased in both size and amount, while more small pores (Feret diameter < 200 μm) were also introduced. 3D networks of α-Al15(Fe,Mn)3Si2 and β-Al5FeSi phases were revealed by Lab X-ray Computed Tomography, however, it isdifficult to perform a quantitative analysis of the respective volume fraction of α-Al15(Fe,Mn)3Si2 and β-Al5FeSi phase fromtheir 3D morphology. Monotonic tensile tests on both alloys show the mechanical properties of the studied alloys were notsensitive to the Fe/Mn content, while the fractography analysis reveals that cracks growth and final fracture under monotonicload are more prone to occur through the eutectic Si, Al2Cuphases and iron-intermetallics than through aluminium matrix.
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