Header menu link for other important links
X
Leveraging transient mechanical effects during stress relaxation for ductility improvement in aluminium AA 8011 alloy
Kali Prasad, , Jayant Jain
Published in Elsevier Ltd
2018
Volume: 255
   
Pages: 1 - 7
Abstract
The mechanical behaviour during stress relaxation of metals has generated considerable interest in the recent years owing to its contribution to ductility. Most of the past studies were focused on ferrous alloys. In the present work, an attempt is made to systematically quantify the improvement in ductility during stress relaxation in AA 8011 aluminium alloy. Room temperature uni-axial tensile tests with single relaxation step were performed under different combinations of pre-strain, strain rate and relaxation time. The ductility was found to increase in all the cases. The parametric dependence of ductility improvement can be assessed using an empirical equation. It was found that the ductility improvement in aluminium is significant compared to SS 316 under similar conditions. The stress-time data obtained is modelled using a recently proposed logarithmic law and is found to fit the experimental data well. The underlying transient mechanisms responsible for ductility improvement are explored by conducting image based fractography analysis of the samples post failure. The fractography was complemented with nano-indentation technique to characterize the homogenization of internal stress. © 2017 Elsevier B.V.
About the journal
JournalData powered by TypesetJournal of Materials Processing Technology
PublisherData powered by TypesetElsevier Ltd
ISSN09240136
Open AccessNo
Concepts (18)
  •  related image
    Aluminum
  •  related image
    Ductility
  •  related image
    Fractography
  •  related image
    FRACTURE MECHANICS
  •  related image
    Image enhancement
  •  related image
    Indentation
  •  related image
    Iron alloys
  •  related image
    Strain rate
  •  related image
    Tensile testing
  •  related image
    DUCTILITY IMPROVEMENT
  •  related image
    Empirical equations
  •  related image
    LOGARITHMIC LAW
  •  related image
    Mechanical behaviour
  •  related image
    Nanoindentation techniques
  •  related image
    Parametric dependence
  •  related image
    SINGLE RELAXATION
  •  related image
    TRANSIENT MECHANICAL
  •  related image
    Stress relaxation