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Microstructural Evolution and Strengthening of AM90 Magnesium Alloy Processed by ECAP

  • Research Article - Mechanical Engineering
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Abstract

Equal-channel angular pressing (ECAP) was applied on AM90 magnesium alloy using processing route \(\hbox {B}_{\mathrm {C}}\) at \(275\,^\circ \)C up to four passes. Microstructural evolution and the corresponding modification in mechanical properties (strength, elongation and hardness) corresponding to the number of ECAP passes were evaluated using X-ray diffraction (XRD), electron backscatter diffraction, scanning electron microscopy, transmission electron microscopy, tensile test and microhardness test. Shear deformation was found to refine the microstructure by breaking it into smaller grains formed by dislocation reconstruction. Tensile strength and hardness were found to increase by \(\sim \)128 and 23%, respectively, for ECAP-processed 2-pass sample in comparison with that of the homogenized condition. After two passes, tensile strength and hardness started decreasing even though the grain size was still decreasing, which was found to be associated with texture modification during ECAP processing as observed by XRD analysis.

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Acknowledgements

We would like to thank Dr. Shashank Shekhar, Assistant Professor, IIT Kanpur, India, for his support in providing the laboratory facilities which helped us to carry out this work.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, 575025, India

    K. R. Gopi & H. Shivananda Nayaka

  2. Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India

    Sandeep Sahu

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  1. K. R. Gopi
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  2. H. Shivananda Nayaka
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Correspondence to K. R. Gopi.

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Gopi, K.R., Shivananda Nayaka, H. & Sahu, S. Microstructural Evolution and Strengthening of AM90 Magnesium Alloy Processed by ECAP. Arab J Sci Eng 42, 4635–4647 (2017). https://doi.org/10.1007/s13369-017-2574-3

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