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Effect of Rare Earth Er on Microstructure and Creep Behavior of Al–7Si–0.3Mg Alloy

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Abstract

The effect of 0.25 wt% and 0.5 wt% rare earth Er addition on the microstructure and creep behavior of the cast A356 alloy was investigated. The microstructure of the alloys before and after the creep was evaluated by optical and scanning electron microscopy equipped with energy dispersive spectrometry. The creep behavior was examined by the impression creep test at the temperature range of 493 to 553 K under the stresses between 480 and 680 MPa. Results showed that the addition of Er addition caused the α-Al dendrites to refine and the morphology of the eutectic silicon to modify significantly. The microstructure of the A356 alloy with Er addition was characterized by Er-rich intermetallics. The lattice self-diffusion climb-controlled creep was found to be the dominant creep mechanism in all alloys. The addition of Er improved the creep resistance of the A356 alloy and the alloy modified with 0.5 wt% Er exhibited the highest creep resistance.

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Acknowledgements

Financial support provided by Shahid Chamran University of Ahvaz (Ahvaz, Iran) through the Grant No. SCU.EM98.375 is gratefully appreciated.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, 61357-83151, Iran

    S. Rashno, M. Reihanian & Khalil Ranjbar

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  1. S. Rashno
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  2. M. Reihanian
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  3. Khalil Ranjbar
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Correspondence to M. Reihanian.

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Rashno, S., Reihanian, M. & Ranjbar, K. Effect of Rare Earth Er on Microstructure and Creep Behavior of Al–7Si–0.3Mg Alloy. Met. Mater. Int. 27, 1448–1457 (2021). https://doi.org/10.1007/s12540-019-00562-2

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