Solute segregation in 'white zones' of welded aluminium alloys

Rahman Sajedur, Ian Polmear

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Abstract

Microanalysis has been used to measure solute segregation in the region of grain boundaries in welded Al-Mg-Si and Al-Mg alloys. By comparing results with those obtained in an earlier study of a welded Al-Zn-Mg alloy, it has been deduced that segregation of zinc to grain boundaries in the so-called white zones adjacent to the weld bead is more important than magnesium in promoting intercrystalline stress-corrosion cracking. Observations have also been made concerning the diffusivity of magnesium in aluminum in the presence or absence of other solute elements and the characteristics of white ones in specimens welded by the TIG or MIG processes.

Original languageEnglish
Pages (from-to)733-736
Number of pages4
JournalZeitschrift fuer Metallkunde/Materials Research and Advanced Techniques
Volume74
Issue number11
Publication statusPublished - 1 Jan 1983

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