To correlate the grain sizes with Sc and Sc + Zr additions, we
examined the macrographs and micrographs of all samples. Fig. 3
shows the macrographs of samples obtained from the fluidity
experiments, showing grain size. In this study, it is not possible
to determine the grain size according to ASTM E112-88 because
of the size limitation of samples. However, it can be qualitatively
observed that the Sc and Sc with Zr additions can refine grain size.
Samples with the addition of 0.4 wt.% Sc additions displayed the
finest grain size at all temperatures. The higher temperature samples
have larger grain sizes, but this effect was less significant than
changing the alloyed composition. Dahle et al. [18] reported that
finer grain size should improve fluidity of molten aluminum. If this
is true for grain refinement due to Sc addition, it would be expected
that the samples with 0.4 wt.% Sc should have the highest fluidity.
To correlate the grain sizes with Sc and Sc + Zr additions, we
examined the macrographs and micrographs of all samples. Fig. 3
shows the macrographs of samples obtained from the fluidity
experiments, showing grain size. In this study, it is not possible
to determine the grain size according to ASTM E112-88 because
of the size limitation of samples. However, it can be qualitatively
observed that the Sc and Sc with Zr additions can refine grain size.
Samples with the addition of 0.4 wt.% Sc additions displayed the
finest grain size at all temperatures. The higher temperature samples
have larger grain sizes, but this effect was less significant than
changing the alloyed composition. Dahle et al. [18] reported that
finer grain size should improve fluidity of molten aluminum. If this
is true for grain refinement due to Sc addition, it would be expected
that the samples with 0.4 wt.% Sc should have the highest fluidity.
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