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The quantitative correlation between strength, ductility and precipitate microstructures in
the vicinity of grain boundaries with precipitate free zones (PFZ) was evaluated for Al-Zn-Mg(-Ag,
Cu) alloys using transmission electron microscopy (TEM), three-dimensional atom probe (3DAP)
and tensile test. In the Al-Zn-Mg ternary and Cu-added alloys aged at 433K, larger widths of PFZ
were observed by TEM and resulted in lower elongations to fracture, independent of the size of grain
boundary precipitates. On the other hand, the elongation of the Ag-added alloy was higher, if
compared at the same levels of proof stress, due to the much smaller width of PFZ. This strongly
suggests that PFZ is harmful to fracture of the investigated alloys. From a 3DAP analysis,
furthermore, it was revealed that Ag and Cu atoms are incorporated in the nanoclusters from the
initial stage of aging. In this work, the elongation was well correlated to the width of PFZ, size of
grain boundary precipitates and the level of proof stress, enabling to predict ductility of the alloys
from known microstructural factors.
Sprache
Englisch
Identifikatoren
ISSN: 0255-5476, 1662-9752
eISSN: 1662-9752
DOI: 10.4028/www.scientific.net/MSF.519-521.431
Titel-ID: cdi_proquest_miscellaneous_29546785
Format
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