Atomic pillar-based nanoprecipitates strengthen AlMgSi alloys

Science
J H ChenH W Zandbergen

Abstract

Atomic-resolution electron microscopy reveals that pillarlike silicon double columns exist in the hardening nanoprecipitates of AlMgSi alloys, which vary in structure and composition. Upon annealing, the Si2 pillars provide the skeleton for the nanoparticles to evolve in composition, structure, and morphology. We show that they begin as tiny nuclei with a composition close to Mg2Si2Al7 and a minimal mismatch with the aluminum matrix. They subsequently undergo a one-dimensional growth in association with compositional change, becoming elongated particles. During the evolution toward the final Mg5Si6 particles, the compositional change is accompanied by a characteristic structural change. Our study explains the nanoscopic reasons that the alloys make excellent automotive materials.

References

Oct 15, 1996·Physical Review. B, Condensed Matter·G Kresse, J Furthmüller

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Citations

Dec 18, 2013·Nano Letters·Sairam K MalladiHenny W Zandbergen
Nov 18, 2011·Micron : the International Research and Review Journal for Microscopy·Canying Cai, Jianghua Chen
Feb 13, 2010·Micron : the International Research and Review Journal for Microscopy·Fang LinJianghua Chen
Feb 12, 2014·Optics Express·A T J TorranceK A Nugent
Apr 23, 2016·Nature Communications·S PogatscherJ F Löffler
Jan 31, 2015·Micron : the International Research and Review Journal for Microscopy·Yumei WangGuangcan Che
Dec 10, 2017·Nature Communications·Deep ChoudhuriRajarshi Banerjee
Aug 25, 2020·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·W Z WangH Q Ye
Nov 11, 2018·Scientific Reports·Takuya MaedaYasuhiro Aruga
May 21, 2017·Scientific Reports·Chunhui LiuHenny W Zandbergen
Oct 20, 2019·Nature Communications·Phillip DumitraschkewitzStefan Pogatscher
Jan 5, 2019·Physical Review Letters·Anirudh Raju Natarajan, Anton Van der Ven
May 22, 2021·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Meng LiZhi-Wei Shan

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