Determination of onset of plasticity (yielding) and comparison of local mechanical properties of friction stir welded aluminum alloys using the micro‐ and nano‐indentation techniques

Determination of onset of plasticity (yielding) and comparison of local mechanical properties of... Purpose – The purpose of this paper is to determine if the nanoindentation technique is a reliable method and whether it can be used to measure the surface hardness (H) in friction stir welded aluminum alloys. In order to test the reliability of nanoindentation technique, nanohardness values for friction stir welded aluminum alloys were compared to microhardness values. Additionally, the onset of plasticity (yielding) is investigated. Design/methodology/approach – Nanoindentation experiments were performed for the determination of onset on plasticity (yielding) and comparison of local mechanical properties of both welded alloys. In order to test the reliability of nanoindentation technique, nanohardness values for friction stir welded AA6082 were compared to microhardness values. The specimen was tested using two different instruments – a Vickers microhardness tester and a nanoindenter tester for fine scale evaluation of H. Findings – The results of this study indicate that nanohardness values with a Berkovich indenter reliably correlate with Vickers microhardness values. Nanoindentation technique can provide reliable results for analyzing friction stir welded aluminum alloys. The welding process definitely affects the material mechanical properties. Originality/value – Microhardness and nanohardness obtained values can be correlated carefully, regarding the similarities and the differences of the two above mentioned techniques. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Structural Integrity Emerald Publishing

Determination of onset of plasticity (yielding) and comparison of local mechanical properties of friction stir welded aluminum alloys using the micro‐ and nano‐indentation techniques

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Publisher
Emerald Publishing
Copyright
Copyright © 2013 Emerald Group Publishing Limited. All rights reserved.
ISSN
1757-9864
DOI
10.1108/17579861311303690
Publisher site
See Article on Publisher Site

Abstract

Purpose – The purpose of this paper is to determine if the nanoindentation technique is a reliable method and whether it can be used to measure the surface hardness (H) in friction stir welded aluminum alloys. In order to test the reliability of nanoindentation technique, nanohardness values for friction stir welded aluminum alloys were compared to microhardness values. Additionally, the onset of plasticity (yielding) is investigated. Design/methodology/approach – Nanoindentation experiments were performed for the determination of onset on plasticity (yielding) and comparison of local mechanical properties of both welded alloys. In order to test the reliability of nanoindentation technique, nanohardness values for friction stir welded AA6082 were compared to microhardness values. The specimen was tested using two different instruments – a Vickers microhardness tester and a nanoindenter tester for fine scale evaluation of H. Findings – The results of this study indicate that nanohardness values with a Berkovich indenter reliably correlate with Vickers microhardness values. Nanoindentation technique can provide reliable results for analyzing friction stir welded aluminum alloys. The welding process definitely affects the material mechanical properties. Originality/value – Microhardness and nanohardness obtained values can be correlated carefully, regarding the similarities and the differences of the two above mentioned techniques.

Journal

International Journal of Structural IntegrityEmerald Publishing

Published: Mar 1, 2013

Keywords: Alloys; Joining processes; Plasticity; Hardness; Welding; Friction stir welding; Onset of plasticity; Yielding; Microhardness; Nanohardness; Nanoindentation; Aluminum alloys

References

  • Analysis of fully plastic Brinell indentation
    Biwa, S.; Storakers, B.
  • On the initial unloading slope in indentation of elastic‐plastic solids by an indenter with an axisymmetric smooth profile
    Cheng, C.M.; Cheng, Y.T.
  • Relationships between hardness, elastic modulus, and the work of indentation
    Cheng, Y.T.; Cheng, C.M.
  • Effect of phase transformations on the shape of the unloading curve in the nanoindentation of silicon
    Domnich, V.; Gogotsi, Y.; Dub, S.
  • A numerical study on pile‐up in nanoindentation creep
    Mandal, S.; Kose, S.; Frank, A.; Elmustafa, A.A.
  • Predictive model to estimate the stress‐strain curves of bulk metals using nanoindentation
    Pelletier, H.

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