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The Effect of Surface Mechanical Attrition Treatment Time on Microstructure and Mechanical Properties of AZ31 Mg Alloy

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Abstract

In recent years, surface mechanical attrition treatment (SMAT) operations have drawn the researchers attention in terms of the impact of this operation on wear resistance, hardness and creation of residual stresses. In this study, the effect of SMAT operation time on microstructure, residual stress, hardness and wear resistance was investigated. For this purpose, the specimens were subjected to SMAT at three times of 10, 15 and 20 min and compared with the As-received specimen (specimen without SMAT). XRD has been used to measure grain size and residual stress, SEM to check the microstructure, the hardness, wear resistance and roughness of the specimens were also measured. The results showed that the grain size decreases due to SMAT operation, so that the grain size decreasees from 139.2 nm in the As-received specimen to 93.2, 72.6 and 34.9 nm in the SMAT specimens with times of 10, 15 and 20 minutes, respectively. Also, residual stress is created due to compressive force and microstrain as a result of SMAT operation, which is 158, 170 and 234 MPa for 10, 15 and 20 min SMAT specimens, respectively. As a result of SMAT operation, the hardness and wear resistance of the specimens increase, which is due to the fact that the fine grains, nanocrystalline of their grains and many microstrains created. Studies have shown that hardness and wear resistance increase by 36, 45, 62% and 16, 27, 36% at SMAT times of 10, 15 and 20 min, respectively, compared to the As-received specimen. Examination of the wear mechanism indicates that the wear mechanism in the As-received specimen is strong adhesive and tribochemical wear, which in SMAT specimens decreases due to the increase in hardness of the adhesive wear. Also, by performing SMAT operation, the specimen roughness increases.

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Funding

This work was supported by regular institutional funding, and no additional grants were obtained.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr/Isfahan, Iran

    Ali Kazemi, Ali Heidari, Kamran Amini, Farshid Aghadavoudi & Mohsen Loh-Mousavi

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  1. Ali Kazemi
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  2. Ali Heidari
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  3. Kamran Amini
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  4. Farshid Aghadavoudi
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  5. Mohsen Loh-Mousavi
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Correspondence to Ali Heidari or Kamran Amini.

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Ali Kazemi, Heidari, A., Amini, K. et al. The Effect of Surface Mechanical Attrition Treatment Time on Microstructure and Mechanical Properties of AZ31 Mg Alloy. Prot Met Phys Chem Surf 59, 453–460 (2023). https://doi.org/10.1134/S2070205123700508

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  • DOI: https://doi.org/10.1134/S2070205123700508

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