Effect of silver addition on formation of secondary phases in squeeze cast Al-Cu-Mg alloys
- Effect of silver addition on formation of secondary phases in squeeze cast Al-Cu-Mg alloys
- 김유찬; 김도향; 김원태; 한요섭; 이호인
- squeeze casting; Al-Cu-Mg alloy; Silver alloying; Microstructure
- Issue Date
- Materials science and technology : MST : a publication of the Institute of Metals
- VOL 17, NO 2, 215-222
- The effect of silver addition on the formation of secondary phases in squeeze cast Al–4.0Cu–1.5Mg and Al–4.0Cu–1.5Mg–0.7Ag (all wt-%) alloys has been investigated using optical microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffractometry, and transmission electron microscopy. The as cast microstructure of both alloys consists of primary dendritic α-Al and various types of secondary solidification phase, e.g. Al2Cu, Al2CuMg, Al(Cu,Ag)Mg, and icosahedral (I) and decagonal (D) quasicrystalline phases. However, the solidification path in the interdendritic region during squeeze casting is different for each alloy, i.e. L→ternary α-Al–Al2Cu–Al2CuMg eutectic in Al–4.0Cu–1.5Mg and L→L′+Al2Cu→α-Al–Al2Cu–Al(Cu0.75Ag0.25)Mg eutectic in Al–4.0Cu–1.5Mg–0.7Ag. This indicates that silver acts as an alloying element stabilising the formation of Al(Cu,Ag)Mg Laves phase. The remaining copper and iron rich liquid in the interdendritic region at the final stage of solidification solidifies into a mixed structure of α-Al, Al2Cu, and AlCuFe I (or D) phases. The composition of the I and D phases, measured by energy dispersive X-ray spectroscopy, is in the range Al–(27∼28)Cu–(9∼10)Fe and Al–(26∼27)Cu–(7∼9)Fe (all at.-%) respectively.
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