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Effect of shot peening on the fatigue behaviour of cast magnesium A8

Shot peening produces beneficial compressive residual stresses near to the surface of materials which improves fatigue performance. Shot peening of magnesium alloys is challenging owing to their low hardness and brittle behaviour. This is the first paper to address the more complex issue of shot peening cast magnesium (rather than wrought alloys) where there is competition between the compressive residual stress generated by peening and the porosity left from the casting process. The paper shows, using a statistical analysis of the fatigue data that shot peening is effective in improving the fatigue life of cast magnesium alloys despite the porosity.