velocity used. At the lower melt velocity, increased Zn con- tent led to an increased flaw size distribution and hence re- duced quality. There is also some evidence that suggested high Zn contents correlated historically with porosity out- breaks and increased reject rates. We believe if a higher Zn alloy was proven to be more expensive in production, both from the perspective of increased density and from increased reject rates, then a lower Zn version of the alloy would be preferable. (Note B380 is the low Zn version of A380 alloy, having <1%Zn).
Reviewer: Table 2 contains a lot of data. The 1 sigma, and 2 sigma lines could be eliminated.
Authors: The tables contain important data to help clarify the shape of the distribution for the results, and the authors believe it is instructive to the reader. That is, ±1σ describes 68.2% of the data, ±2σ describes 95.4% of the data, and ±3σ describes 99.7% of the data.
Reviewer: Is there a significant difference in Alloy 1 and 2 at 26 m/s?
Authors: The Weibull modulus of tensile strength for Alloys 1 and 2 are nearly identical, as stated in the text, but the po- sition parameter for the two is different (i.e. the failure prob- ability curve for Alloy 2 is moved to the right, Figure 9a).
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International Journal of Metalcasting/Summer 2011
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