On the intergranular hydrogen embrittlement mechanism of Al-Li alloys

Journal Article · Fri May 01 04:00:00 EDT 1992 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(92)90266-H· OSTI ID:7294585

Zohdi, T I; Meletis, E I ^[1]

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1. Louisiana State University, Baton Rouge (United States)

An investigation is conducted of the stress-assisted grain-boundary diffusion of hydrogen in Al-Li alloys, with a view to the characterization of the intergranular embrittlement mechanism. A comparison of theoretical predictions with experimental observations indicates that intergranular hydrogen embrittlement involves the nucleation of an incremental crack at the edge of the plastic zone that extends not only backwards, to join the original crack, but also forwards: in a region that is stressed above a critical level and has a rather elevated hydrogen concentration. Crack jump distance predictions are in excellent agreement with experimental observations; ligament fracture is the step controlling the hydrogen-embrittlement fracture process. 17 refs.

• OSTI ID: 7294585
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 26:10; ISSN SCRME; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
CORROSION
CRACK PROPAGATION
CRACKS
CRYSTAL STRUCTURE
DIFFUSION
EMBRITTLEMENT
FRACTURE MECHANICS
GRAIN BOUNDARIES
HYDROGEN EMBRITTLEMENT
INTERGRANULAR CORROSION
LITHIUM ALLOYS
MECHANICS
MICROSTRUCTURE