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Microstructure and strengthening of Al-Li-Cu-Mg alloys and MMCs: II. Modelling of yield strength

Starink, M.J., Wang, P., Sinclair, I. and Gregson, P.J. (1999) Microstructure and strengthening of Al-Li-Cu-Mg alloys and MMCs: II. Modelling of yield strength Acta Materialia, 47, (14), pp. 3855-3868. (doi:10.1016/S1359-6454(99)00228-1).

Record type: Article


A detailed quantitative model for the strengthening of monolithic alloys and composites due to precipitation strengthening, solution strengthening, grain and subgrain strengthening, strengthening by dislocations and load transfer to ceramic inclusions is presented. The model includes a newly derived description of the effect of a precipitate free zone (PFZ) around the reinforcing phase incorporating strain hardening of the PFZ. The model is successfully applied to model the experimental data for the proof strengths of four Al Li Cu Mg type alloys and composites aged to obtain a wide range of microstructures and all strengthening contributions are quantified. It is shown that PFZ formation in the 8090 MMC causes a drastic reduction in the proof strength (about 100 MPa), but it has little influence on the time required for peak ageing. In all alloys strengthening due to GPB zones is more important than strengthening due to delta' (Al3Li) phase.

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Published date: 19 October 1999
Keywords: precipitation, strengthening, Al-Li-Cu-Mg, GPB, MMC, PFZ


Local EPrints ID: 41412
ISSN: 1359-6454
PURE UUID: 4edfd542-f0ce-49f0-9c0c-16bfbf982239

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Date deposited: 07 Sep 2006
Last modified: 17 Jul 2017 15:30

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Author: M.J. Starink
Author: P. Wang
Author: I. Sinclair
Author: P.J. Gregson

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