Specimens and engine brackets manufactured by the high pressure die cast magnesium alloy MRI-4 showed superior fatigue properties under constant amplitude loading compared to AZ-91. No significant differences were observed by impact tests with components. However MRI-4 components presented a lower fatigue life under variable amplitude loading and a real damage sum, which was significantly lower than 1. A plastic pre-deformation of the MRI-4 components increased their fatigue strength, while the components of AZ-91 revealed a neutral behaviour.

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