Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 682, Issue -, Pages 640-647Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.11.092
Keywords
Aluminum alloy; Quench sensitivity; Germanium; Silver
Categories
Funding
- National Key Research and Development Program of China [2016YFB0300900]
- Natural Science Foundation of China [51171209]
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The effects of Ge and Ag additions on quench sensitivity and mechanical properties of an Al-Zn-Mg-Cu alloy are investigated using tensile testing, hardness testing, differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscope (TEM). Results show that a small addition of Ge significantly reduces quench sensitivity but decreases the ductility of Al-Zn-Mg-Cu alloy. In the Ge-added alloy, some large Mg2Ge particles at grain boundaries are observed, which causes a decrease in the alloy ductility. When Ag is added to Al-Zn-Mg-Cu-Ge alloy, a combination of low quench sensitivity and improved ductility is obtained. It is also found that Ag promotes more uniform decomposition of supersaturated solid solution during aging. As a result, the density of eta' precipitates increases both in the vicinity of grain boundaries and in grain interiors.
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