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Grain boundary segregation and hydrogen-induced fracture in 7050 aluminium alloy

Authors
Journal
Acta Materialia
1359-6454
Publisher
Elsevier
Publication Date
Volume
44
Issue
8
Identifiers
DOI: 10.1016/1359-6454(95)00406-8
Disciplines
  • Chemistry

Abstract

Abstract The relationships between grain boundary segregation and crack growth of stress corrosion and corrosion fatigue in 7050 aluminium alloy have been investigated under various aging conditions; the effects of grain boundary segregation on intergranular fracture work have been calculated using a quasichemical approach. The results show that the hydrogen content at the crack tip and the crack growth rate increase with the concentration of solid solution Mg on increasing grain boundary; both Mg and H segregation induce the intergranular fracture work to decrease. Mg segregation accelerates H enriching and crack propagation. It is indicated that a MgH interaction occurs in the processes of corrosion fatigue as well as stress corrosion.

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