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Oxidation Behavior of AZ91D Magnesium Alloy Containing Nd or Gd

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Abstract

The influence of Nd and Gd additions on the evolution of microstructure, surface hardness and oxidation behavior of the extruded AZ91D magnesium alloy exposed to air was investigated in the temperature range from 290 to 410 °C. The kinetics of the oxidation process was obtained from gravimetric measurements performed during 28 days. Nd and Gd formed Al-rich intermetallic compounds (Al2Gd, Al2Nd, Al–Mn–Gd and Al–Mn–Nd) and reduced the volume fraction of β-Mg17Al12 phase. Surface degradation of the AZ91D alloy, with and without Gd or Nd, was negligible for temperatures below 370 °C. At 410 °C, the grain size and oxidation rate significantly increased, although lanthanide-containing alloys revealed lower degradation compared with the unmodified AZ91D alloy.

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Acknowledgments

The authors are grateful to the MCYT (Spain, Project MAT 2009-09845-C02-01), the Community of Madrid (Spain, S2009MAT-1585) and the MANOEQ of Departamento de Metalurgia Física of CENIM (CSIC) for supply of the test materials. R. Arrabal and E. Matykina are grateful to the MICINN (Spain) for financial support via the Ramon y Cajal Programme (RYC-2008-02038, RYC-2010-06749). K. Paucar is grateful to the Fundación Carolina for funding a grant.

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Authors and Affiliations

  1. Departamento de Ciencia de Materiales, Facultad de Ciencias Químicas, Universidad Complutense, 28040, Madrid, Spain

    R. Arrabal, A. Pardo, M. C. Merino, M. Mohedano, P. Casajús & E. Matykina

  2. Gabinete de Corrosión, Facultad de Ingeniería Química y Textil, Universidad Nacional de Ingeniería, Cod. Postal 25, Lima, Peru

    K. Paucar

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  1. R. Arrabal
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  2. A. Pardo
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Correspondence to R. Arrabal.

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Arrabal, R., Pardo, A., Merino, M.C. et al. Oxidation Behavior of AZ91D Magnesium Alloy Containing Nd or Gd. Oxid Met 76, 433–450 (2011). https://doi.org/10.1007/s11085-011-9265-3

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  • DOI: https://doi.org/10.1007/s11085-011-9265-3

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