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

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Science (New York, N.Y.), ISSN: 1095-9203

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Jin, Sunghwan; Huang, Ming; Kwon, Youngwoo; Zhang, Leining; Li, Bao-Wen; Oh, Sangjun; Dong, Jichen; Luo, Da; Biswal, Mandakini; Cunning, Benjamin V; Bakharev, Pavel V; Moon, Inyoung; Yoo, Won Jong; Camacho-Mojica, Dulce C; Kim, Yong-Jin; Lee, Sun Hwa; Wang, Bin; Seong, Won Kyung; Saxena, Manav; Ding, Feng; Shin, Hyung-Joon; Ruoff, Rodney S. Show More Hide
American Association for the Advancement of Science (AAAS); AMER ASSOC ADVANCEMENT SCIENCE
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article description
Single-crystal metals have unique properties due 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 prepare extremely large single-crystal metal foils by 'contact-free annealing' from commercial polycrystalline foils. The colossal grain growth (up to 32 cm) 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 from this discovery.