Next Article in Journal
Modification Mechanism of Spinel Inclusions in Medium Manganese Steel with Rare Earth Treatment
Next Article in Special Issue
Structural Aspects of Execution and Thermal Treatment of Welded Joints of Hardox Extreme Steel
Previous Article in Journal
Experimental Study and Numerical Simulation of the Intermittent Feed High-Speed Grinding of TC4 Titanium Alloy
Previous Article in Special Issue
Interface Behavior and Impact Properties of Dissimilar Al/Steel Keyhole-Free FSSW Joints
Open AccessArticle

Residual Stress, Microstructure and Mechanical Properties in Thick 6005A-T6 Aluminium Alloy Friction Stir Welds

1
Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China
2
CRRC Changchun Railway Vehicles Co. Ltd., Changchun 130000, China
3
Helmholtz-Zentrum Berlin für Energie und Materialien, Hahn Meitner Platz 1, 14109 Berlin, Germany
4
Shanxi Key Laboratory of Friction Welding Technologies, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
5
Department of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
6
State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work and should be considered as co-first authors.
Metals 2019, 9(7), 803; https://doi.org/10.3390/met9070803
Received: 3 July 2019 / Revised: 17 July 2019 / Accepted: 18 July 2019 / Published: 21 July 2019
(This article belongs to the Special Issue Characterization of Welded Joints)
  |  
PDF [6793 KB, uploaded 21 July 2019]
  |  

Abstract

Plates (37 mm thick) of 6005A-T6 aluminum alloy were butt joined by a single-sided and double-sided friction stir welding (FSW). The 3D residual stresses in the joints were determined using neutron diffraction. The microstructures were characterized by a transmission electron microscope (TEM) and electron backscatter diffraction (EBSD). In the single-sided FSW specimen, there were acceptable mechanical properties with a tensile strength of 74.4% of base metal (BM) and low residual stresses with peak magnitudes of approximately 37.5% yield strength of BM were achieved. The hardness is related to the grain size of the nugget zone (NZ), and in this study, precipitations were dissolved due to the high heat input. In the double-sided FSW specimen, there were good mechanical properties with a tensile strength of 80.8% of BM, but high residual stresses with peak magnitudes of approximately 70% yield strength of BM were obtained. The heat input by the second pass provided an aging environment for the first-pass weld zone where the dissolved phases were precipitated and residual stresses were relaxed. View Full-Text
Keywords: residual stresses; friction stir welding; neutron diffraction; aluminium alloys; hardness; precipitation residual stresses; friction stir welding; neutron diffraction; aluminium alloys; hardness; precipitation
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Liu, X.; Xie, P.; Wimpory, R.; Li, W.; Lai, R.; Li, M.; Chen, D.; Liu, Y.; Zhao, H. Residual Stress, Microstructure and Mechanical Properties in Thick 6005A-T6 Aluminium Alloy Friction Stir Welds. Metals 2019, 9, 803.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top