|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Materials for Transportation and Lightweighting
||Microstructures, Precipitation Sequence, and Hardening of Al-Mg-Zn Alloys with High Mg:Zn Ratio
||Yangyang Fan, Diran Apelian
|On-Site Speaker (Planned)
Al-11Mg-2.4Zn alloy has a eutectic reaction: L→Al +T+β at temperature of 445°C. After solutionization at 435 °C, the eutectic T and β phases are mostly dissolved in aluminum matrix. The subsequent aging of the alloy at the temperature between 160 °C to 200 °C leads to the precipitation of T”, T’, and β’. The precipitation sequence is discovered to be: SSS → GP zone → T”→ clustered T”→ phase T’ phase; β’ precipitates are found to be coexisting with T’ phases when aging temperature is above 200°C. When specimens are aged at 160 °C for 12 hours, the optimized tensile properties was obtained, and microstructure analysis shows that a large amount of 5~30 nm in radius, full coherent L12 crystal structure T” precipitates are homogenously distributed in the grains and as well as in the grain boundaries.
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