Direct observation of grain rotations during coarsening of a semisolid Al–Cu alloy

Jules Dake; Jette Oddershede; Henning Osholm Sørensen; Thomas Werz; J. Cole Shatto; Kentaro Uesugi; Søren Schmidt; Carl E. Krill Jr.

doi:10.1073/pnas.1602293113

Direct observation of grain rotations during coarsening of a semisolid Al–Cu alloy

Jules Dake, Jette Oddershede, Henning Osholm Sørensen, Thomas Werz, J. Cole Shatto, Kentaro Uesugi, Søren Schmidt, Carl E. Krill Jr.

Department of Chemistry

20 Citations (Scopus)

Abstract

Sintering is a key technology for processing ceramic and metallic powders into solid objects of complex geometry, particularly in the burgeoning field of energy storage materials. The modeling of sintering processes, however, has not kept pace with applications. Conventional models, which assume ideal arrangements of constituent powders while ignoring their underlying crystallinity, achieve at best a qualitative description of the rearrangement, densification, and coarsening of powder compacts during thermal processing. Treating a semisolid Al-Cu alloy as a model system for late-stage sintering-during which densification plays a subordinate role to coarsening-we have used 3D X-ray diffraction microscopy to track the changes in sample microstructure induced by annealing. The results establish the occurrence of significant particle rotations, driven in part by the dependence of boundary energy on crystallographic misorientation. Evidently, a comprehensive model for sintering must incorporate crystallographic parameters into the thermodynamic driving forces governing microstructural evolution.

Original language	English
Journal	Proceedings of the National Academy of Science of the United States of America
Volume	113
Issue number	41
Pages (from-to)	E5998–E6006
Number of pages	9
ISSN	0027-8424
DOIs	https://doi.org/10.1073/pnas.1602293113
Publication status	Published - 11 Oct 2016

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Direct observation of grain rotations during coarsening of a semisolid Al–Cu alloy. / Dake, Jules; Oddershede, Jette; Sørensen, Henning Osholm et al.

In: Proceedings of the National Academy of Science of the United States of America, Vol. 113, No. 41, 11.10.2016, p. E5998–E6006.

Research output: Contribution to journal › Journal article › Research › peer-review

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abstract = "Sintering is a key technology for processing ceramic and metallic powders into solid objects of complex geometry, particularly in the burgeoning field of energy storage materials. The modeling of sintering processes, however, has not kept pace with applications. Conventional models, which assume ideal arrangements of constituent powders while ignoring their underlying crystallinity, achieve at best a qualitative description of the rearrangement, densification, and coarsening of powder compacts during thermal processing. Treating a semisolid Al-Cu alloy as a model system for late-stage sintering-during which densification plays a subordinate role to coarsening-we have used 3D X-ray diffraction microscopy to track the changes in sample microstructure induced by annealing. The results establish the occurrence of significant particle rotations, driven in part by the dependence of boundary energy on crystallographic misorientation. Evidently, a comprehensive model for sintering must incorporate crystallographic parameters into the thermodynamic driving forces governing microstructural evolution.",

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AU - Dake, Jules

AU - Oddershede, Jette

AU - Sørensen, Henning Osholm

AU - Werz, Thomas

AU - Shatto, J. Cole

AU - Uesugi, Kentaro

AU - Schmidt, Søren

AU - Krill Jr., Carl E.

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AB - Sintering is a key technology for processing ceramic and metallic powders into solid objects of complex geometry, particularly in the burgeoning field of energy storage materials. The modeling of sintering processes, however, has not kept pace with applications. Conventional models, which assume ideal arrangements of constituent powders while ignoring their underlying crystallinity, achieve at best a qualitative description of the rearrangement, densification, and coarsening of powder compacts during thermal processing. Treating a semisolid Al-Cu alloy as a model system for late-stage sintering-during which densification plays a subordinate role to coarsening-we have used 3D X-ray diffraction microscopy to track the changes in sample microstructure induced by annealing. The results establish the occurrence of significant particle rotations, driven in part by the dependence of boundary energy on crystallographic misorientation. Evidently, a comprehensive model for sintering must incorporate crystallographic parameters into the thermodynamic driving forces governing microstructural evolution.

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ER -

Direct observation of grain rotations during coarsening of a semisolid Al–Cu alloy

Abstract

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