The effect of nanocrystallization and free volume on the room temperature plasticity of Zr-based bulk metallic glasses

K. Mondal, T. Ohkubo, T. Toyama, Y. Nagai, M. Hasegawa, K. Hono

Research output: Contribution to journalArticle

96 Citations (Scopus)

Abstract

To understand the mechanism of the room temperature plasticity of bulk metallic glasses (BMGs), microstructure observations, density measurements and positron annihilation studies were carried out for Zr-based BMGs cast at various temperatures and post-annealed under different conditions. We found that higher casting temperatures cause partial crystallization, which enhance the plasticity as long as the volume fraction of the crystalline phase is low. However, a similar nanocrystalline microstructure produced by post-annealing often leads to a large loss of plasticity, while certain conditions enhance the plasticity. Based on density measurements and positron annihilation lifetime spectroscopy, we conclude that the relative contribution of free volume and nanocrystallization is important for acquiring plasticity in metallic glasses.

Original languageEnglish
Pages (from-to)5329-5339
Number of pages11
JournalActa Materialia
Volume56
Issue number18
DOIs
Publication statusPublished - 2008 Oct 1

Keywords

  • Free volume
  • Metallic glass
  • Nanocrystal
  • Plastic deformation
  • Shear band

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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