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Microstructure and texture evolution in Mg–1 %Mn–Sr alloys during extrusion

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Abstract

Microstructure and texture evolution in Mg–1 %Mn–Sr alloys during extrusion has been investigated. At 350 °C, the extrusion of Mg–1 %Mn (M1) alloy exhibits the progressive formation of basal texture from the undeformed zone to the die opening. The extruded microstructure of M1 consists of recrystallized grains nucleated by grain boundary bulging and elongated parent grains along with extensive twinning. At 350 °C, the extrusion of M1–1.6Sr alloy results in progressive elongation of Mg–Sr precipitates in the form of stringers from the undeformed zone to the die opening. The final extruded microstructure of this alloy shows extensive recrystallization occurring at the intermetallic stringers by particle-stimulated nucleation (PSN). M1–(0.3–1.6)%Sr alloys display weaker textures due to PSN which creates new grains with random orientations. At 250 °C, the extrusion of M1 creates necklace of small recrystallized grains around large elongated parent grains. M1–1.6Sr alloy extruded at 250 °C exhibits continuous dynamic recrystallization (CDRX) in the Mg matrix and PSN at Mg–Sr precipitates. PSN is less extensive at lower temperature. Both CDRX and PSN grains have random orientations, and therefore, alloy develops random texture.

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Acknowledgements

This work was supported by the strategic project grant from Natural Sciences and Engineering Research Council (NSERC) of Canada with the industrial support of Applied Magnesium (formerly Timminco). We thank Dr. Majid Hoseini for his valuable help in texture analysis. We also thank Pierre Vermette for his useful contribution in alloy synthesis. One of the authors, Hemant Borkar, would like to thank McGill University for their financial support through MEDA (McGill Engineering Doctoral Award) award.

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Authors and Affiliations

  1. Department of Mining and Materials Engineering, McGill University, Wong Building, 3610 University Street, Montreal, QC, H3A 2B2, Canada

    Hemant Borkar & Mihriban Pekguleryuz

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  1. Hemant Borkar
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  2. Mihriban Pekguleryuz
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Correspondence to Hemant Borkar.

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Borkar, H., Pekguleryuz, M. Microstructure and texture evolution in Mg–1 %Mn–Sr alloys during extrusion. J Mater Sci 48, 1436–1447 (2013). https://doi.org/10.1007/s10853-012-6896-y

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  • DOI: https://doi.org/10.1007/s10853-012-6896-y

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