Some fatigue lives of a magnesium-0.6 wt.-% zirconium alloy at 430°C and an alternating stress of 1400 lb/in2 are presented. Homogenizing and/or precipitation heat-treatments carried out on hot-worked material are shown to be generally deleterious to fatigue endurances. The effects of heat-treatments are assessed in terms of observed microstructure. It is revealed that high fatigue strengths are incompatible with high creep strengths in certain circumstances. The likelihood of solute diffusion being enhanced by fatigue and the growth of grain-boundary denuded zones are discussed.
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