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Gunde, P.; Schiffl, A.; Uggowitzer, P.J.
Materials science & engineering. A, Structural materials : properties, microstructure and processing, 10/2010, Letnik: 527, Številka: 26Journal Article
▶ We discovered that addition of small amounts of Y has a very positive effect on the hot tearing susceptibility (HTS) of Mg–Zn–Zr alloys. ▶ We attribute the reduced HTS to the effect of Y on the solidification path at the terminal period of solidification; Y addition generates an increase in the solidus temperature. ▶ We explain the increase in the solidus temperature by means of a simple “virtual element enrichment” approach: it is caused by the formation of the ternary phase Mg 3YZn 6. The influence of Y additions on the hot tearing behaviour of Mg–Zn alloys was investigated in this study. In permanent mould castings and in direct chill cast ingots, alloying of a few wt.% Y results in a significant reduction of hot tearing susceptibility. The reduced susceptibility is attributed to the effect of Y on the solidification path at the terminal period of solidification: it increases the solidus temperature and thus shortens the solidification path, which in turn reduces the terminal freezing range. Via thermodynamic calculations it is shown that this is caused by the formation of the ternary phase Mg 3YZn 6. Using a simplified version of Clyne and Davies’ model, the influence of the terminal freezing range on hot tearing susceptibility is clearly illustrated.
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