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, 44:22 | Cite as

In-plane anisotropy and tensile deformation behaviour of aluminium alloy AA 2014 forge plates

  • G NarenderEmail author
  • E Ramjee
  • N Eswara Prasad
Article
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Abstract

Plastic flow behaviour and fracture mechanism of aluminium alloy AA 2014 forged plates under tensile loading conditions are investigated and the results obtained are presented and discussed in the present study. The effects of heat treatment (namely, solution treatment and artificial ageing) on micro-structural homogeneity, tensile behaviour and nature of fracture were studied using hardness, tensile, optical and scanning electron microscopy methods. Experimental engineering stress–engineering strain and true stress–true strain data of the aluminium alloy AA 2014 in different ageing conditions have been analysed using Hollomon, Ludwik and Ludwigson plastic flow relationships. The alloy is found to exhibit moderate degree of in-plane anisotropy and anisotropic index. Further, the alloy in both solution-treated and aged conditions exhibits three different stages of strain-hardening rate and the highest strain-hardening rate occurs at regions of lower strain both in solution-treated and peak-aged conditions. It is also observed that the longitudinal specimen (L parallel to forging direction) exhibits higher strain hardening, while the specimen with T orientation exhibits lowest strain-hardening rates both in solution-treated and aged conditions. The alloy under study in all the heat treatment conditions exhibits ductile fracture mechanism with higher density of uniformly distributed macro- and micro-dimples.

Keywords

Aluminium alloy AA 2014 in-plane anisotropy strain hardening fracture mechanism anisotropic index plastic flow 

Notes

Acknowledgements

The authors thank SAIF, IIT Bombay, for the permission in utilising the facility of SEM. The authors also thank RCMA, DRDO, Hyderabad, for heat treatment, optical microscopy and hardness testing and AMTL, Hyderabad, for tensile testing. One of the authors (G Narender) gratefully acknowledges Dr K Chandra Shekar for his help and encouragement.

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringVignan Institute of Technology and ScienceHyderabadIndia
  2. 2.Department of Mechanical Engineering, JNTUH College of EngineeringJawaharlal Nehru Technological UniversityHyderabadIndia
  3. 3.Defence Materials and Stores R&D Establishment (DMSRDE)Defence Research and Development OrganisationKanpurIndia

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