Abstract
The microstructures of Al-10 Sr alloy quenched at various wheel speeds have been investigated using X-ray diffractometry (XRD) and transmission electron microscopy (TEM). The experimental results show that the microstructures of melt-spun Al-10 Sr alloy are quite different from those of ingot-like alloy consisting of coarse plate-like Al4Sr embedded in the eutectic matrix. For lower wheel speeds of 500 and 1000 rpm, the microstructure is composed of nanoscale particle-like Al4Sr embedded in α-Al solid solution. With wheel speeds exceeding 1500 rpm, the formation of primary Al4Sr phase is completely suppressed and the eutectic microstructure consisting of alternate dark and bright zones is obtained. Eutectic Al4Sr in dark zones is stripe-like and irregular blocky, while regular stripe-like in bright zones, about 10–20 nm in width. Furthermore, modification tests indicate that the modification performance of melt-spun Al-10 Sr alloy is much better than that of ingot-like alloy, reducing the amount of Sr addition and greatly shortening the incubation time. The reasons for the formation of microstructures and the improvement of modification performance of melt-spun Al-10 Sr master alloy have also been discussed.
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