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Microstructural Characterization and Electrochemical Behavior of AA2014 Al-Cu-Mg-Si Alloy of Various Tempers

  • K. S. Ghosh
  • Kapil Tripati
Article
  • 20 Downloads

Abstract

AA2014 Al-Cu-Mg-Si alloy is subjected to aging heat treatment, and microstructural features and electrochemical behavior of the AA2014 Al-Cu-Mg-Si alloy of various tempers have been characterized. Hardness measurement of the alloy of different tempers showed typical age hardening behavior. X-ray diffraction and transmission electron microscopy studies revealed the presence of characteristic phases. Differential scanning calorimetry study displayed the sequence of solid-state precipitation and dissolution reactions in the AA2014 alloy of various tempers. Electrochemical behavior was assessed by measurement of variation of open-circuit voltage with time, potentiodynamic polarization and potentiodynamic cyclic polarization of the AA2014 alloy of various tempers in 3.5 wt.% NaCl solution at near neural (pH ~ 7) and at alkaline (pH 12) conditions. Potentiodynamic polarization studies of different tempers in 3.5 wt.% NaCl solution at pH ~ 7 showed that the corrosion potential (Ecorr) value has shifted toward more negative (active) direction with increasing aging time. The cyclic polarization in 3.5 wt.% NaCl solution at pH ~ 7 displayed active–passive behavior and also showed a large hysteresis loop indicating high pit growth damage.

Keywords

AA2014 Al-Cu-Mg-Si alloy DSC electrochemical polarization hardness TEM XRD 

Notes

Acknowledgments

Authors would like to thank the Director, National Institute of Technology (NIT), Durgapur, India, for developing facilities for research. Authors are also grateful to the staff members of Central Research Facility, Indian Institute of Technology, Kharagpur, India, for extending the HRTEM facility.

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Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.Department of Metallurgical and Materials EngineeringNational Institute of TechnologyDurgapurIndia

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