EFFECTS OF Pb AND Mg ON THE PROPERTIES OF LONG TERM AGING Zn-4Al ALLOY

Tests were made of the effects of Pb and Mg on the property changes ofZn-4Al alloy in 20 years natural aging. It appears to that Pb is favourable tothe phase transformation of alloy which is remarkably caused its volume change.Mg dissloves in the Zn alloy with in its certain maximum solubility only. Thisseems to be independent of Pb contaminated. The optimum addition of Mg maythen be chosen properly. Furthermore, the influence of presence of Cu was alsodiscussed.