Abstract
The creep strength of the magnesium-zirconium alloy ZA is examined at 400° C and 200 psi after heattreatment at 600° C in different atmospheres. It is found that while improvements in the creep properties are obtained by an homogenisation anneal and grain growth, further significant improvements in creep strength can be obtained by precipitation of the zirconium in the ZA as zirconium hydride. This precipitate can be formed during the pre-anneal at 600° C or during creep testing at 400° C by reaction with hydrogen or moisture in the annealing or testing atmospheres. It is shown that precipitation of zirconium hydride is not by itself sufficient to produce an improvement in creep strength. Grain growth is also a requirement for improved creep properties.
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