is considerable coring, the dendrites will have a range of hardness that will lead to some scatter in the microhard- ness measurements. Figure 8 presents micrographs show-


ing the indentations from the hardness testing. The differ- ences in hardness of the various phases are evident from the size of the diamond indentations.


(a) Alloy 1


(a) Yield strength


(b) Alloy 2


(b) Ultimate tensile strength


(c) Alloy 3


(c) Elongation


Figure 6. Plots of mechanical properties as a function of test temperature.


International Journal of Metalcasting/Winter 10


Figure 7. Comparison of mechanical properties of the three alloys.


23


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