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Investigations on the Creep Behavior of Friction-Stir-Processed Magnesium Alloy AE42

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Abstract

Magnesium alloy AE42 is a candidate material for high-temperature applications. However, as-cast AE42 alloy exhibits poor high-temperature creep properties because of the microstructure that shows a continuous network of β-Mg17Al12 and Al-RE precipitates along the boundaries of coarse α-Mg grains. In the current work, friction stir processing technique was adopted to refine the coarse as-cast structure of the AE42 alloy and break up the continuous network of β-Mg17Al12 and Al-RE precipitates. The creep properties of the parent material and friction-stir-processed specimens were determined by impression creep test at 150, 175, 200, 225 and 250 °C. The results demonstrated that the presence of fragmented precipitates and the elimination of continuous network structure improved the creep resistance of the AE42 alloy. The metallurgical analysis revealed that no new precipitates were formed after friction stir processing and creep testing. From the data, it can be concluded that friction stir processing of AE42 alloy can lead to an increase in service temperatures from 150 to 225 °C.

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Acknowledgments

The authors are thankful to the Non-Ferrous Technology Development Center, Hyderabad and Indian Institute of Technology Madras, Chennai, for providing facilities to perform microstructural analysis, creep test and access to x-ray diffractometer, transmission electron microscope, scanning electron microscope and energy-dispersive x-ray spectroscopy analytical facilities.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, India

    M. Govindaraju & R. Vaira Vignesh

  2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, India

    Uday Chakkingal

  3. Department of Chemical and Materials Engineering, University of Nevada, Reno, USA

    Prasad Rao Kalvala

  4. Nonferrous Materials Technology Development Center, Hyderabad, India

    K. Balasubramanian

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  1. M. Govindaraju
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Govindaraju, M., Chakkingal, U., Kalvala, P.R. et al. Investigations on the Creep Behavior of Friction-Stir-Processed Magnesium Alloy AE42. J. of Materi Eng and Perform 29, 3172–3182 (2020). https://doi.org/10.1007/s11665-020-04848-0

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