Journal
MATERIALS CHARACTERIZATION
Volume 145, Issue -, Pages 258-267Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2018.08.051
Keywords
Al-Mg-Si-Cu alloy; Zn-containing; Age hardening; Precipitation evolution
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Funding
- National Key R&D Program of China [2016YFB0300802]
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The effects of Zn on the age hardening behavior and corresponding microstructure of an Al-0.9Mg-0.8Si-0.2Cu (wt%) alloy were investigated by hardness testing, transmission electron microscopy (TEM) and three-dimensional atom probe (3DAP). During aging for up to 8 h at 170 degrees C (peak hardness condition), the addition of Zn does not alter the precipitation sequence of the Al-Mg-Si alloy, which can be expressed as: supersaturated solid solution -> solute clusters -> GP zones -> beta ''. The Zn does not significantly partition into clusters or precipitates, and the majority of Zn remains in the Al matrix, prompting the formation of solute clusters during the early stage of aging and subsequently stimulating the transformation from solute clusters to GP zones to beta '' precipitates. The characterization of precipitation evolution caused by Zn addition correlates well with the observed enhanced age hardening response.
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