Superplastic Extensibility of Nanocrystalline Copper at Room Temperature ●L.Lu,M.L.Sui,K.Lu* ● Science287,1463(2000); E=0%(as-deposited) 50 mm 8=200% 老■600% 8=2000% E=5100% ©Superplastic Extensibility of Nanocrystalline Copper at Room Temperature  L. Lu, M. L. Sui, K. Lu*  Science 287, 1463 (2000);