Abstract
The microstructure of the melt-spun Al–7Sr–3Ti alloy has been characterized using X-ray diffraction, transmission electron microscopy and differential scanning calorimetry. The results show the microstructure of the melt-spun Al–7Sr–3Ti alloy is composed of the equilibrium α-Al, Al 4Sr, Al 3Ti and metastable Al 23Ti 9, different from that of the ingot-like alloy comprising α-Al, Al 4Sr and Al 3Ti. Moreover, the amount of Al 3Ti is much less than that of Al 4Sr and metastable Al 23Ti 9 in the melt-spun alloy. The melting temperature of primary phases and enthalpies of fusion for the melt-spun Al–7Sr–3Ti alloy are lower than those for the ingot-like alloy. The formation mechanism of the microstructure of the melt-spun alloy has also been discussed.
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