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Effect of Annealing and Aging Treatment on Pitting Corrosion Resistance of Fine-Grained Mg-8%Al-0.5%Zn Alloy

  • Gajanan M. NaikEmail author
  • S. Narendranath
  • S. S. Satheesh Kumar
  • Sandeep Sahu
Microstructure Evolution During Deformation Processing
  • 19 Downloads

Abstract

In order to study the influence of plastic deformation, annealing and aging treatment on pitting corrosion, the AZ80Mg alloy was subjected to equal-channel angular pressing (ECAP) by route R at 325°C for up to 4 ECAP passes (P) and annealing conditions of 523 K, 623 K and 723 K followed by aging treatment at 6 h and 12 h. A microhardness and corrosion study was accomplished and microstructural evolution was recorded using optical microscopy (OM), scanning electron microscopy and electron backscatter diffraction (EBSD). OM and EBSD analysis showed that a fine-grain microstructure with average grain sizes of 32.87 µm and 6.35 µm was achieved after 2P and 4P of ECAP, respectively. During annealing and aging treatment, the fine-grain Mg alloy revealed that the maximum microhardness and improved corrosion resistance were observed mainly due to redistribution of β-secondary phases. Specifically, 12 h aged specimens at 523 K represented maximum microhardnesses of about 85 Hv and 87 Hv for ECAP-2P and -4P, respectively. Also, 12 h aging at 723 K appeared preferable for accomplishing enhanced corrosion properties.

Notes

Acknowledgement

This work was supported by DRDO-NRB, Government of India, under Grant Number NRB/4003/PG/366.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Corrosion Engineering Laboratory, Department of Mechanical EngineeringNational Institute of Technology KarnatakaSurathkal, MangaluruIndia
  2. 2.Department Mechanical EngineeringMangalore Institute of Technology and EngineeringMoodbidri, MangaluruIndia
  3. 3.Defence Metallurgical Research Laboratory, KanchanbaghHyderabadIndia
  4. 4.Department of Materials Science and EngineeringIndian Institute of Technology KanpurKanpurIndia

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