Cell invasion during competitive growth of polycrystalline solidification patterns

Younggil Song, Fatima L. Mota, Damien Tourret, Kaihua Ji, Bernard Billia, Rohit Trivedi, Nathalie Bergeon and Alain Karma ()
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Younggil Song: Northeastern University
Fatima L. Mota: IM2NP
Damien Tourret: IMDEA Materials Institute
Kaihua Ji: Northeastern University
Bernard Billia: IM2NP
Rohit Trivedi: Iowa State University
Nathalie Bergeon: IM2NP
Alain Karma: Northeastern University

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Spatially extended cellular and dendritic array structures forming during solidification processes such as casting, welding, or additive manufacturing are generally polycrystalline. Both the array structure within each grain and the larger scale grain structure determine the performance of many structural alloys. How those two structures coevolve during solidification remains poorly understood. By in situ observations of microgravity alloy solidification experiments onboard the International Space Station, we have discovered that individual cells from one grain can unexpectedly invade a nearby grain of different misorientation, either as a solitary cell or as rows of cells. This invasion process causes grains to interpenetrate each other and hence grain boundaries to adopt highly convoluted shapes. Those observations are reproduced by phase-field simulations further demonstrating that invasion occurs for a wide range of misorientations. Those results fundamentally change the traditional conceptualization of grains as distinct regions embedded in three-dimensional space.

Date: 2023
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DOI: 10.1038/s41467-023-37458-0

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