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Oxidation behaviour of AM50 magnesium alloy containing lanthanide elements

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Abstract

The influence of Nd and Gd additions on the microstructure, hardness and oxidation of AM50 magnesium alloy was investigated. Nd and Gd formed Al2Nd, Al2Gd, Al[BOND]Mn[BOND]Nd and Al[BOND]Mn[BOND]Gd intermetallics and reduced the amount of β-phase. Grain size and hardness did not change significantly with the addition of Nd or Gd. For all the alloys, surface degradation was negligible at temperatures below 370 °C. However, at 410 °C, severe oxidation was observed and hardness values decreased by ∼30% due to grain coarsening. At this temperature, the modified alloys revealed oxidation rates between ∼2.3 and 20 times smaller than the unmodified alloy.

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