Microstructure mapping in friction stir welds of 7449 aluminium alloy using SAXS

M Dumont, A Steuwer, A Deschamps, MJ Peel, PJ Withers

Research output: Contribution to journalArticle (Academic Journal)

79 Citations (Scopus)

Abstract

This paper describes the microstructural response of an age-hardenable, high-strength 7449 aluminium alloy to friction stir welding. Plates in the naturally aged (T3) and over-aged (T79) conditions were welded using two weld tool translation speeds. Maps of precipitate volume fraction and size were obtained by spatially resolved small-angle X-ray scattering over a cross-section of the welded plate, complemented by direct observations made by transmission electron microscopy. The spatial variations of precipitate volume fraction and size were assessed quantitatively for the characteristic zones of the welds, and supported by complementary hardness measurements. The effect of initial microstructure and welding speed, in particular in the heat-affected and thermomechanically affected zones, is discussed.
Original languageEnglish
Pages (from-to)4793 - 4801
Number of pages8
JournalActa Materialia
Volume54,18
DOIs
Publication statusPublished - Oct 2006

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