Colossal grain growth yields single-crystal metal foils by contact-free annealing.

Published on Nov 30, 2018in Science41.845
· DOI :10.1126/SCIENCE.AAO3373
Sunghwan Jin12
Estimated H-index: 12
Ming Huang31
Estimated H-index: 31
(UNIST: Ulsan National Institute of Science and Technology)
+ 19 AuthorsRodney S. Ruoff165
Estimated H-index: 165
Single-crystal metals have distinctive properties owing to the absence of grain boundaries and strong anisotropy. Commercial single-crystal metals are usually synthesized by bulk crystal growth or by deposition of thin films onto substrates, and they are expensive and small. We prepared extremely large single-crystal metal foils by “contact-free annealing” from commercial polycrystalline foils. The colossal grain growth (up to 32 square centimeters) is achieved by minimizing contact stresses, resulting in a preferred in-plane and out-of-plane crystal orientation, and is driven by surface energy minimization during the rotation of the crystal lattice followed by “consumption” of neighboring grains. Industrial-scale production of single-crystal metal foils is possible as a result of this discovery.
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