Abstract
The refining effect of Al–5Ti–1B–1RE master alloy on as-cast microstructures of A357 alloy was studied by optical microscopy (OM) and scanning electron microscopy (SEM). The results showed that the Al–5Ti–1B–1RE master alloy could refine the A357 grain effectively. The grain refining effect achieved the best with 1.0 wt% Al–5Ti–1B–1RE master alloy addition level, dendrite was also remarkably refined. The addition of RE elements improved the wetting quality of the molten Al to TiB2 and Al3Ti phase, reduced the aggregation tendency of second phase particles, increased the number of nucleation particles and delayed the fading time. At the same time, RE elements is easily adsorbed on grain boundaries and phase interfaces, hindering the growth of Al3Ti, which also increased the nucleation probability. In addition, A1–5Ti–1B–1RE could effectively modify the needle like iron-rich impurity phase to short rod/granular like. A1–5Ti–1B–1RE can get a better refining effect in A357 when compared with Al–5Ti–1B.
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Zhang, C., Bai, Y., Zhang, Z., Li, B., Chen, C. (2018). Effects of Al–Ti–B–RE Grain Refiner on Microstructure of A357 Alloy. In: Han, Y. (eds) Advances in Materials Processing. CMC 2017. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-0107-0_83
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