Abstract
Mg–8Gd–1Dy–0.3Zn (wt.%) alloy was prepared by high-pressure die-casting technique. The thermal stability, mechanical properties at temperature range from room temperature to 573 K and strengthening mechanism was investigated. The results showed that the die-cast state alloy was mainly composed of fine cellular equiaxed grain. The fine porosity-free skin region was related to the aggregation of rare earth elements. The long lamellar-shaped stacking compound containing Zn and polygon-shaped precipitate were observed along the grain boundaries. The die-cast sample exhibited high mechanical properties and good thermal stability until 523 K. It was demonstrated that the outstanding mechanical properties are mainly attributed to the small grain boundaries, stable skin region and some dispersed precipitates in the alloy formed by high-pressure die-cast.
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