Fig. 4. Shown is the load versus strain plot for samples taken from the Al-Si-1%Ba alloys with varying silicon content.


T e proportion of eutectic silicon and primary dendrite appears consistent with what is expected of the cast alloys. Figure 4 shows the load vs. strain plot for a typical tensile sample taken


Fig. 5. Shown is the load versus strain plot for a sample taken from T6 heat treated Al-6%Si-1% Ba alloy.


from each of the Al-6%Si-1%Ba, Al-8.5%Si-1%Ba and Al-10.5%Si- 1%Ba alloys. Table 1 shows how the increase in barium from 0.5% to 2.0% improved strength and decreased


ductility. Figure 4 also shows alloys with lower silicon content yielded lower UTS values but higher ductility . T e UTS of 145Mpa found for the Al-10.5%Si alloy is comparable to the


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March 2016 MODERN CASTING | 49


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