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The effect of trace additions (0 – 0.1 wt.%) of titanium on the microstructure, mechanical properties and creep resistance of an AM50 alloy have been studied. The microstructure was examined using optical microscopy and scanning electron microscopy. Results showed that the microstructures of AM50 alloy were obviously refined by trace Ti addition, although the actual content of Ti was only about 0.0025 – 0.0079 wt.%. The refining ability of titanium was ascribed to its large growth restriction factor, and it can be described as a constitutional undercooling driven mechanism. As-cast samples were subjected to tensile tests at room temperature, 150 °C and 200 °C. A considerable increase in tensile properties was observed due to grain refinement, especially the ultimate tensile strength and elongation. In addition, the creep resistance of AM50 alloy was dramatically increased by Ti addition.

Effect of trace Ti on the microstructure and mechanical properties of AM50 alloy