title: Rate-dependent serrated flow and plastic deformation in Ti45Zr16Be20Cu10Ni9bulk amorphous alloy during nanoindentation.
abstract: The plastic deformation of Ti45Zr16Be20Cu10Ni9bulk metallic glass has been investigated by nanoindentation performed with loads ranging from 10 to 200 mN in a wide range of loading rates. The plastic flow in the alloy exhibited conspicuous serrations at low loading rates. The serrations, however, became less prominent as the rate of indentation increased. Atomic force microscopy showed a significant pile-up of materials around the indents, indicating that a highly localized plastic deformation occurred under nanoindentation. The possible mechanism governing the plastic deformation in bulk metallic glass specimens is tentatively discussed in terms of strain-induced free volume.
authors.affiliation: Centre for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Schinchon-dong, Seodaemun-ku, Seoul 120-749, South Korea.
authors.forename: Dinesh
authors.initials: D
authors.lastname: Kumar Misra
authors.affiliation: Centre for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Schinchon-dong, Seodaemun-ku, Seoul 120-749, South Korea.
authors.forename: Sung
authors.initials: S
authors.lastname: Woo Sohn
authors.affiliation: Department of Physics, Cheongju University, Cheongju 360-764, South Korea.
authors.forename: Won
authors.initials: W
authors.lastname: Tae Kim
authors.affiliation: Centre for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Schinchon-dong, Seodaemun-ku, Seoul 120-749, South Korea.
authors.forename: Do
authors.initials: D
authors.lastname: Hyang Kim
keywords: AFM; TEM; metallic glass; nanoindentation