Starink, M.J., Wang, S.C. and Sinclair, I.
A model for local proof strength of 2xxx welds
Jata, Kumar J., Mahoney, M.W. and Mishra, R.S. (eds.)
Friction stir welding and processing III.
2005 TMS Annual Meeting
The Minerals, Metals & Materials Society
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The microstructure development and resulting hardness and yield strength profiles of Al 2xxx welds are modelled via a combined analysis of primary precipitation, coarsening, resolution, partial/full melting and resolidification and re-precipitation. Local strengthening is dominated by two types of precipitates: the Cu-Mg clusters (or zones) which form at low temperature and dissolve at temperatures above about 230ºC, and the S phase which dominates the reaction at both the maximum and minimum strength locations. The model is compared to microstructural and hardness data from friction stir welded 2024. The combined heat flow-microstructure-strengthening models show hardness predictions that are in line with experimental observations of local hardness variations close to the weld centre line, and different situations of local minima and maxima are reproduced.
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