Effect of Erbium Content on Microstructure and Properties of Cast-Rolled 6061 Aluminum Alloy Sheet
In this paper,the effect of trace Er elements on the microstructure evolution of double-roll cast 6061 aluminum alloy sheet is studied.The NF6-300 vertical double-roll casting and rolling mechanism is used to prepare 6061 casts and rolled plates with different Er content,and the main forms and mechanism of Er in the alloys are analyzed by metallography observation,scanning electron microscopy and transmission electron microscopy.The results show that the addition of trace Er can form a primary Al3 Er phase in the cast-rolled plate,which can become an excellent heterogeneous nucleus core of α-Al in the phase organization.The grains of 6061 aluminum alloy cast-rolled plate can be greatly refined.In addition,Er and Fe interact with each other,and the Fe-rich phase of needle and skeletal-like in the tissue is transformed into smaller rod and block.However,when the content of Er in cast-rolled plate is too much,Er elements accumulate,and the size of rare earth compounds and impurity phases containing Er increases obviously.
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