Suppression of Intergranular Fracture in 7000 Series Aluminum Alloys

Goroh Itoh; Keisuke Hiyama; Bo Fan Lyu; Junya Kobayashi

doi:10.4028/www.scientific.net/MSF.1016.1811

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HomeMaterials Science ForumMaterials Science Forum Vol. 1016Suppression of Intergranular Fracture in 7000...

Suppression of Intergranular Fracture in 7000 Series Aluminum Alloys

Abstract:

The 7000 series aluminum alloys suffer from intergranular fracture (IGF) that limits the use of the alloys, although they have highest strength among aluminum alloys. The types of IGF can be classified into two categories: (i) with smooth fracture surface showing practically no plastic deformation that takes place in hydrogen embrittlement and stress corrosion cracking, and (ii) with shallow and fine dimples on the fracture surface showing localized plastic deformation inside precipitate free zones. In this study, attempts have been made to suppress the IGF of both types by (a) controlling precipitate microstructure on grain boundaries by quench control and (b) controlling grain boundary morphology by strain induced boundary migration. The IGF of type (i) (hydrogen embrittlement) was successfully suppressed both by the two controlling processes.

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Periodical:

Materials Science Forum (Volume 1016)

Pages:

1811-1815

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.1016.1811

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Online since:

January 2021

Authors:

Goroh Itoh*, Keisuke Hiyama, Bo Fan Lyu, Junya Kobayashi

Keywords:

7000 Series Aluminum Alloy, Dimple, Grain Boundary, Hydrogen Embrittlement, Intergranular Fracture, Precipitation, Strain Induced Boundary Migration

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