ROLE OF GRAIN-BOUNDARY SEGREGATION IN CORROSION-FATIGUE PROCESS OF HIGH-STRENGTH ALUMINUM-ALLOY

Authors
SONG RG ZHANG BJ TSENG MK
Citation
Rg. Song et al., ROLE OF GRAIN-BOUNDARY SEGREGATION IN CORROSION-FATIGUE PROCESS OF HIGH-STRENGTH ALUMINUM-ALLOY, Materials chemistry and physics, 45(1), 1996, pp. 84-87
Citations number
7
Categorie Soggetti
Material Science
Journal title
Materials chemistry and physics → ACNP
ISSN journal
02540584
Volume
45
Issue
1
Year of publication
1996
Pages
84 - 87
Database
ISI
SICI code
0254-0584(1996)45:1<84:ROGSIC>2.0.ZU;2-T
Abstract
Effects of grain boundary segregation on fatigue crack growth in 7050 aluminium alloy have been investigated under various aging conditions in a humid air environment. The results show that with increased aging , the concentration of Mg segregation on the grain boundary decreases, resulting in a reduction in the fatigue crack growth rate for the sam e humidity and value of Delta K. The effect of grain boundary Mg segre gation on the fracture stress has been calculated using the quasi-chem ical method. The result indicates that Mg segregation induces fracture reduction and grain boundary embrittlement.