Abstract
For a further understanding an effect of impurities on mechanical property of α brass, tensile test was conducted at elevated temperatures up to 803K under a strain rate of 6.7 x 10-4 s-1 using three kinds of Cu-30mass%Zn containing some different impurities with different grain sizes. The coarse-grained specimens show a poor ductility at intermediate temperature range, while fine-grained specimens show an excellent ductility. However, these tendencies strongly depend on contents of the impurities. In particular the alloy containing Sn and Fe tends to show poor ductility.
Elongation to fracture was discussed concerning the formation of recrystalized structure with fine grains due to dynamic recrystalization and due to the effect of impurities on the dynamic recrystalization.
