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Effect of Friction Stir Processing Procedures on Microstructure and Mechanical Properties of Mg-Al-Zn Casting

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Abstract

Cast Mg-Al-Zn (AZ80) alloy was subjected to friction stir processing (FSP) with three different FSP procedures: single pass, single pass with a pre–solution treatment (pre-ST), and two pass. FSP resulted in remarkable grain refinement, significant breakup, and dissolution of the coarse, networklike Mg17Al12 phase. While the single-pass FSP procedure produced a heterogeneous microstructure with Mg17Al12 particle-rich bands, both the pre-ST FSP and the two-pass FSP procedures resulted in the generation of a uniform microstructure. The pre-ST FSP and two-pass FSP samples exhibited significantly enhanced strength and ductility due to remarkable grain refinement and dissolution of coarse Mg17Al12 phase. A post-FSP aging resulted in the precipitation of fine Mg17Al12 particle, thereby increasing the strength of the FSP samples. Among three FSP samples, the aged two-pass FSP sample exhibited the highest ultimate tensile strength (UTS) of 356 MPa and an elongation of 17 pct.

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  1. Hitachi is a trademark of Hitachi High-Technologies Corporation, Tokyo, Japan.

  2. LECO is a trademark of LECO Corporation, St. Joseph, MI.

  3. Instron is a trademark of Instron Corporation, Norwood, MA.

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Acknowledgments

The authors gratefully acknowledge the support of (a) the National Outstanding Young Scientist Foundation of China under Grant No. 50525103, (b) the National Basic Research Program of China under Grant No. 2006CB605205, (c) the Hundred Talents Program of Chinese Academy of Sciences, (d) the National High-tech Research Program under Grant No. 2006AA03Z111, and (e) the China Postdoctoral Science Foundation for A.H. Feng.

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Author notes

  1. A. H. Feng (Research Fellow)

    Present address: Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON, M5B 2K3, Canada

Authors and Affiliations

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, P.R. China

    A. H. Feng (Research Fellow) & R. S. Chen (Professor)

  2. Shenyang National Laboratory for Materials Science, Shenyang, P.R. China

    B. L. Xiao (Associate Professor) & Z. Y. Ma (Professor)

Authors
  1. A. H. Feng
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  2. B. L. Xiao
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  4. R. S. Chen
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Correspondence to Z. Y. Ma.

Additional information

Manuscript submitted January 23, 2009.

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Feng, A.H., Xiao, B.L., Ma, Z.Y. et al. Effect of Friction Stir Processing Procedures on Microstructure and Mechanical Properties of Mg-Al-Zn Casting. Metall Mater Trans A 40, 2447–2456 (2009). https://doi.org/10.1007/s11661-009-9923-0

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  • DOI: https://doi.org/10.1007/s11661-009-9923-0

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