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Effect of the LPSO volume fraction on the microstructure and mechanical properties of Mg–Y2X –Zn X alloys

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Abstract

The influence of the volume fraction of long-period stacking ordered structure (LPSO) on the microstructure and mechanical properties in three extruded Mg100-3x Y2x Zn x alloys (x = 0.5, 1 and 1.5 at.%) has been studied. Two structures of LPSO phase coexist in these extruded alloys, 18R and 14H. The 18R structure transforms to 14H structure gradually in the course of the extrusion process. For the three alloys, the grain size in the vicinity of LPSO phase particles is refined because of a particle-stimulated nucleation (PSN) mechanism. The reinforcing effect of the LPSO phase is active up to 523 K. Above this temperature, grain size effect becomes important. Accordingly, MgY1Zn0,5 extruded alloy shows the Highest mechanical strength for temperatures greater than 523 K.

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Acknowledgements

This work was supported by the Ministry of Science and Innovation through the MAT2006-11731 Project. E. Oñorbe also thanks the CSIC her JAE contract.

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Authors and Affiliations

  1. Department of Physical Metallurgy, Nacional Center for Metallurgical Research, CENIM-CSIC. Av. Gregorio del Amo, 8, 28040, Madrid, Spain

    E. Oñorbe, G. Garcés, P. Pérez & P. Adeva

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  1. E. Oñorbe
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  2. G. Garcés
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  3. P. Pérez
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  4. P. Adeva
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Correspondence to E. Oñorbe.

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Oñorbe, E., Garcés, G., Pérez, P. et al. Effect of the LPSO volume fraction on the microstructure and mechanical properties of Mg–Y2X –Zn X alloys. J Mater Sci 47, 1085–1093 (2012). https://doi.org/10.1007/s10853-011-5899-4

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  • DOI: https://doi.org/10.1007/s10853-011-5899-4

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