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In-situ observation of the fracture process in Al–Zn–Mg–Cu alloys

  • Maja Vratnica
Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 103 Issue 5

Abstract

In order to investigate the fracture behaviour of highly-alloyed Al–Zn–Mg–Cu alloys as a function of alloy purity, in-situ observations using scanning electron microscopy were performed during tensile testing. The observations were used to verify proposed fracture mechanisms in conjunction with microstructural and fractographic analyses along with fracture toughness tests. It was found that the fracture process is complex. The nucleation, growth, and coalescence of voids precede ductile fracture of the alloys. The decohesion and fracture of intermetallic particles (generally >1 μm in diameter) appears to be the initial event in the fracture process, while mechanism and propagation rate of fracture depend on the alloy chemistry. A tortuous crack path and reduced crack propagation rate in the least pure alloy can be closely related to a strong interaction of the crack front with intermetallic particles.

Keywords: Al–Zn–Mg–Cu alloys; In-situ observations; Fracture; IM particles
* Correspondence address Dr. Maja Vratnica Faculty of Metallurgy and Technology, University of MontenegroDžorža Vašingtona bb, 20 000 Podgorica, Montenegro Tel.: + 382-20-245-406 Fax: + 382-20-245-406 E-mail:

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Received: 2011-4-5
Accepted: 2011-12-19
Published Online: 2013-06-11
Published in Print: 2012-05-01

© 2012, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110731
Keywords for this article
Al–Zn–Mg–Cu alloys; In-situ observations; Fracture; IM particles

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Phase equilibria in the “SnO”–SiO2–“FeO” system in equilibrium with tin–iron alloy and the potential application for electronic scrap recycling
  5. A model to calculate the viscosity of silicate melts
  6. Surface structure of different interstitial austenitic steels after impact wear
  7. Microstructural study of boron-doped Co–Re–Cr alloys by means of transmission electron microscopy and electron energy-loss spectroscopy
  8. Orientation relationship between 14H-LPSO structured X phase and DO3-type (Mg,Zn)3RE phase in an Mg–Gd–Y–Zn–Zr alloy
  9. Microstructural, optical, and dielectric properties of nanocrystalline TiO2 films prepared via ion-assisted magnetron sputtering
  10. An investigation of the microstructure and properties of the explosively welded Gr5–SS304 clad plates for golf heads
  11. Cyclic fibre texture in hot extruded Ni50Mn29Ga21
  12. Development of high-strength pure magnesium and wrought magnesium alloys AZ31, AZ61, and AZ91 processed by hydrostatic extrusion with back pressure
  13. Effect of cerium and aluminium on the hot-deformation behaviour of magnesium
  14. Effect of alloying elements on stage-III work-hardening behaviour of Al–Zn–Mg(–Cu) alloys
  15. Effect of titanium on the as-cast microstructure and impact toughness of hypereutectic high-chromium cast iron
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  22. People
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  25. DGM News
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