Criteria for tensile plasticity in Cu-Zr-Al bulk metallic glasses

S. Pauly, G. Liu, S. Gorantla, G. Wang, U. Kühn, D. H. Kim, J. Eckert

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Abstract

(Cu0.5Zr0.5)100-xAlx (x = 5, 6, 8) bulk metallic glasses (BMGs) were deformed in tension. Besides ductility up to 0.5%, the material shows work-hardening behaviour. Both effects are attributed to the deformation-induced precipitation of B2 CuZr nanocrystals and the formation of twins in the nanocrystals larger than 20 nm. The precipitation of the nanocrystals alters the stress field in the matrix and is expected to retard shear band propagation, which in turn allows stresses in the nanocrystals to rise. This stress build-up is more severe in the larger grains and might be responsible for the subsequent twinning. Both deformation-induced nanocrystallization and twinning consume energy and avoid crack formation and with it premature failure.

Original languageEnglish
Pages (from-to)4883-4890
Number of pages8
JournalActa Materialia
Volume58
Issue number14
DOIs
Publication statusPublished - 2010 Aug 1

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All Science Journal Classification (ASJC) codes

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

Cite this

Pauly, S., Liu, G., Gorantla, S., Wang, G., Kühn, U., Kim, D. H., & Eckert, J. (2010). Criteria for tensile plasticity in Cu-Zr-Al bulk metallic glasses. Acta Materialia, 58(14), 4883-4890. https://doi.org/10.1016/j.actamat.2010.05.026