Colossal grain growth yields single-crystal metal foils by contact-free annealing
Colossal grain growth yields single-crystal metal foils by contact-free annealing
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DOI：
10.1126/science.aao3373
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发表时间：
2018-11-30
期刊：
影响因子：
56.9
通讯作者：
Ruoff, Rodney S.
中科院分区：
文献类型：
--
作者：
Jin, Sunghwan;Huang, Ming;Ruoff, Rodney S.
由于没有晶界和强的各向异性，单晶金属具有独特的性质。商业单晶金属通常通过块状晶体生长或通过在基底上沉积薄膜来合成，它们价格昂贵且体积小。我们通过“无接触退火”从商用多晶箔制备了极大的单晶金属箔。巨大的晶粒生长（高达 32 平方厘米）是通过最小化接触应力来实现的，从而产生优选的面内和面外晶体取向，并由晶格旋转期间的表面能最小化以及随后“消耗”相邻晶粒来驱动。这一发现使得单晶金属箔的工业规模生产成为可能。
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-crystalmetal foils is possible as a result of this discovery.