Microstructural Interactions during Stress Ageing a 7475 Aerospace Alloy

D. Bakavos; Phil B. Prangnell; Bernard Bès; Frank Eberl; J.G. Grossmann

doi:10.4028/www.scientific.net/MSF.519-521.333

Paper Titles

Vacancy-Solute Aggregates in Al-Zn-Mg-(Cu, Ag)
p.309

Key Microstructural Features Responsible for Improved Stress Corrosion Cracking Resistance and Weldability in 7xxx Series Al Alloys Containing Micro / Trace Alloying Additions
p.315

Development of a New 7xxx Ageing Model
p.321

Grain Boundary Precipitate Modification for Improved Intergranular Corrosion Resistance
p.327

Microstructural Interactions during Stress Ageing a 7475 Aerospace Alloy
p.333

Influence of Zinc to Magnesium Ratio and Total Solute Content on the Strength and Toughness of 7xxx Series Alloys
p.339

Microstructural Evolution of a New Aerospace 7XXX Alloy during Retrogression and Re-Ageing Treatment
p.345

Blister Free Heat Treatment of High Pressure Die-Casting Alloys
p.351

Characterisation of Intermetallic Phases in Multicomponent Al-Si Casting Alloys for Engineering Applications
p.359

HomeMaterials Science ForumMaterials Science Forum Vols. 519-521Microstructural Interactions during Stress Ageing...

Microstructural Interactions during Stress Ageing a 7475 Aerospace Alloy

Abstract:

In industrial process, like creep-ageforming, materials are aged under load. To investigate the influence of an applied stress on the ageing behaviour of Cu bearing Al-7xxx series alloys, a 7475 alloy was aged under a constant tensile stress and analysed by means of Small Angle X-ray Scattering (SAXS) and TEM. Mechanical testing was also employed, to determine if there was any effect on the materials strength. The results show that during the early stages of ageing significant interactions takes place, which preferentially aligns one type of GP zone, as well as affecting their size and volume fraction. During the second stage ageing treatment, the applied stress was observed to cause more rapid over-ageing, by promoting the formation of the η phase.

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Periodical:

Materials Science Forum (Volumes 519-521)

Pages:

333-338

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.519-521.333

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Online since:

July 2006

Authors:

D. Bakavos, Phil B. Prangnell, Bernard Bès, Frank Eberl, J.G. Grossmann

Keywords:

AA7475, Age-Forming, Alignment, Al-Zn-Mg-Cu, Constant Stress Ageing, Creep, GP-I, GP-II Zones, Preferential Precipitate Orientation, Small Angle X-Ray Scattering, TEM, η, η'

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