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Microstructure and Mechanical Properties of Extruded Magnesium-Aluminum-Cerium Alloy Tubes

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Abstract

Current commercial magnesium extrusion alloys do not offer desirable combinations of strength, ductility, and extrusion speed for automotive structural applications. The effect of small additions of cerium (Ce) to pure magnesium (Mg) and Mg-3 pct Al alloy extruded tubes has been studied. The results suggest that 0.2 pct Ce addition can significantly improve the extrudability and mechanical properties of the Mg extrusions. The improvement in mechanical properties is due to grain refinement and dispersion strengthening provided by the Mg12Ce particles and the beneficial texture obtained. Higher Ce contents further increase strength, but significantly reduce ductility and cause excessive surface oxidation during extrusion. The beneficial effect of 0.2 pct Ce on mechanical properties of pure Mg is not observed when it is added to Mg-3 pct Al alloy, due to the higher affinity of Ce to Al to form the Al11Ce3 phase in the Mg-Al-Ce ternary alloys. The Mg-0.2 pct Ce alloy is a promising base alloy for further development in automotive applications; however, Al should be avoided in Mg-Ce–based extrusion alloys.

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Acknowledgments

This work was carried out as a collaborative research program supported by General Motors Global Research and Development Center (Warren, MI) and Shanghai Jiao Tong University (Shanghai, China). The authors thank Richard A. Waldo and Robert C. Kubic, Jr. for performing the EPMA analyses and for help with EBSD/fractography studies, respectively.

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Authors and Affiliations

  1. General Motors Global Research & Development, Warren, MI, 48090-9055, USA

    Alan A. Luo (GM Technical Fellow), Raj K. Mishra (Staff Researcher) & Anil K. Sachdev (Lab Group Manager)

  2. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

    Wenyun Wu (Postdoctoral Candidate), Li Jin (Researcher) & Wenjiang Ding (Professor)

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  1. Alan A. Luo
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  2. Wenyun Wu
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  5. Anil K. Sachdev
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  6. Wenjiang Ding
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Correspondence to Alan A. Luo.

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Manuscript submitted January 21, 2010.

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Luo, A.A., Wu, W., Mishra, R.K. et al. Microstructure and Mechanical Properties of Extruded Magnesium-Aluminum-Cerium Alloy Tubes. Metall Mater Trans A 41, 2662–2674 (2010). https://doi.org/10.1007/s11661-010-0278-3

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