Metallurgical and Materials Transactions A

, Volume 47, Issue 9, pp 4566–4577 | Cite as

Friction Stir Welding of Al Alloy 2219-T8: Part II-Mechanical and Corrosion

  • Ju Kang
  • Zhi-Cao Feng
  • Ji-Chao Li
  • G. S. Frankel
  • Guo-Qing Wang
  • Ai-Ping Wu
Article
First Online:

Abstract

In Part I of this series, abnormal agglomerations of θ particles with size of about 100 to 1000 µm were observed in friction stir welded AA2219-T8 joints. In this work, the effects of these agglomerated θ particles on the mechanical and corrosion properties of the joints are studied. Tensile testing with in situ SEM imaging was utilized to monitor crack initiation and propagation in base metal and weld nugget zone (WNZ) samples. These tests showed that cracks initiated in the θ particles and at the θ/matrix interfaces, but not in the matrix. The WNZ samples containing abnormal agglomerated θ particles had a similar ultimate tensile stress but 3 pct less elongation than other WNZ samples with only normal θ particles. Measurements using the microcell technique indicated that the agglomerated θ particles acted as a cathode causing the dissolution of adjacent matrix. The abnormal θ particle agglomerations led to more severe localized attack due to the large cathode/anode ratio. Al preferential dissolution occurred in the abnormal θ particle agglomerations, which was different from the corrosion behavior of normal size θ particles.

Keywords

Crack Initiation Friction Stir Weld Oxygen Reduction Reaction Particle Agglomeration Dynamic Strain Aging 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2016

Authors and Affiliations

  • Ju Kang
    • 1
    • 2
    • 3
  • Zhi-Cao Feng
    • 2
  • Ji-Chao Li
    • 2
  • G. S. Frankel
    • 2
  • Guo-Qing Wang
    • 5
  • Ai-Ping Wu
    • 1
    • 4
  1. 1.Department of Mechanical EngineeringTsinghua UniversityBeijingChina
  2. 2.Fontana Corrosion CenterThe Ohio State UniversityColumbusUSA
  3. 3.North China Electric Power Research Institute Co. Ltd.BeijingChina
  4. 4.State Key Laboratory of TribologyTsinghua UniversityBeijingChina
  5. 5.China Academy of Launch Vehicle TechnologyBeijingChina

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