Effect of impurity content on boundary sliding behavior in the superplastic Zn-22/100 al alloy

摘要

A detailed investigation was conducted on the superplastic Zn-22/100 Al alloy to study the effect of impurity content on grain boundary sliding behavior in region I(low strain rate region), and region II (intermediate strain rate region, or the superplastic region)of the sigmoidal plot between stress and strain rate that was previously reported for the alloy. In conducting the investigation, three grades of Zn-22/100 Al were used; grades I and 2 contain 180 and 100 p.p.m. of impurities, respectively, whereas grade 3 is a high- purity grade containing 6 p.p.m. of impurities.