In-situ STEM imaging of growth and phase change of individual CuAlX precipitates in Al alloy

Scientific Reports
Chunhui LiuHenny W Zandbergen

Abstract

Age-hardening in Al alloys has been used for over a century to improve its mechanical properties. However, the lack of direct observation limits our understanding of the dynamic nature of the evolution of nanoprecipitates during age-hardening. Using in-situ (scanning) transmission electron microscopy (S/TEM) while heating an Al-Cu alloy, we were able to follow the growth of individual nanoprecipitates at atomic scale. The heat treatments carried out at 140, 160, 180 and 200 °C reveal a temperature dependence on the kinetics of precipitation and three kinds of interactions of nano-precipitates. These are precipitate-matrix, precipitate-dislocation, and precipitate-precipitate interactions. The diffusion of Cu and Al during these interactions, results in diffusion-controlled individual precipitate growth, an accelerated growth when interactions with dislocations occur and a size dependent precipitate-precipitate interaction: growth and shrinkage. Precipitates can grow and shrink at opposite ends at the same time resulting in an effective displacement. Furthermore, the evolution of the crystal structure within an individual nanoprecipiate, specifically the mechanism of formation of the strengthening phase, θ', during heat-treatmen...Continue Reading

References

Mar 22, 2005·Nature Materials·Alan J Ardell, Vidvuds Ozolins
Apr 22, 2006·Science·J H ChenH W Zandbergen
May 23, 2006·Nature Materials·Emmanuel ClouetAlexis Deschamps
Aug 9, 2011·Nature Materials·V RadmilovicU Dahmen
Dec 18, 2013·Nano Letters·Sairam K MalladiHenny W Zandbergen
Dec 28, 2009·Advanced Materials·Marijn A van HuisHenny W Zandbergen
Jul 1, 2012·Computational Materials Science·Piotr WarczokErnst Kozeschnik

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Citations

Mar 8, 2020·Nature Communications·Laure BourgeoisNikhil V Medhekar
Feb 26, 2021·Scientific Reports·Hiroshi MiyoshiShigenobu Ogata
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
Jul 1, 2020·Journal of the American Chemical Society·Dmitri Leo Mesoza CordovaDavid C Johnson

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