Abstract
A series of zinc-copper alloys containing up to 2.0 wt % Cu have been prepared and tested in creep under constant load at temperatures up to 200° C. A metallographic study has also been made of the crept specimens. The creep resistance of Zn is shown to increase as the Cu content is raised, although the creep strength increment is small above 1 wt % Cu. Ageing the alloys also improves the creep strength, but precipitation during creep can generate voids which may lead to premature failure. The effect of increasing the Cu content is to make slip and grain-boundary sliding progressively more difficult, and to raiseΔHc, the apparent activation energy for creep. A higher copper content also enables a low value of the stress exponent to persist to higher creep stresses.
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