Effect of geometrical constraint condition on the formation of nanoscale twins in the Ni-based metallic glass composite

M. H. Lee, B. S. Kim, Do Hyang Kim, R. T. Ott, F. Sansoz, J. Eckert

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We investigated the effect of geometrically constrained stress-strain conditions on the formation of nanotwins in -brass phase reinforced Ni59Zr20 Ti16 Si2 Sn3 metallic glass (MG) matrix deformed under macroscopic uniaxial compression. The specific geometrically constrained conditions in the samples lead to a deviation from a simple uniaxial state to a multi-axial stress state, for which nanocrystallization in the MG matrix together with nanoscale twinning of the brass reinforcement is observed in localized regions during plastic flow. The nanocrystals in the MG matrix and the appearance of the twinned structure in the reinforcements indicate that the strain energy is highly confined and the local stress reaches a very high level upon yielding. Both the effective distribution of reinforcements on the strain enhancement of composite and the effects of the complicated stress states on the development of nanotwins in the second-phase brass particles are discussed.

Original languageEnglish
Pages (from-to)351-360
Number of pages10
JournalPhilosophical Magazine Letters
Volume94
Issue number6
DOIs
Publication statusPublished - 2014 Jun 3

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brasses
metallic glasses
reinforcement
composite materials
matrices
axial stress
plastic flow
twinning
nanocrystals
deviation
augmentation
energy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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title = "Effect of geometrical constraint condition on the formation of nanoscale twins in the Ni-based metallic glass composite",
abstract = "We investigated the effect of geometrically constrained stress-strain conditions on the formation of nanotwins in -brass phase reinforced Ni59Zr20 Ti16 Si2 Sn3 metallic glass (MG) matrix deformed under macroscopic uniaxial compression. The specific geometrically constrained conditions in the samples lead to a deviation from a simple uniaxial state to a multi-axial stress state, for which nanocrystallization in the MG matrix together with nanoscale twinning of the brass reinforcement is observed in localized regions during plastic flow. The nanocrystals in the MG matrix and the appearance of the twinned structure in the reinforcements indicate that the strain energy is highly confined and the local stress reaches a very high level upon yielding. Both the effective distribution of reinforcements on the strain enhancement of composite and the effects of the complicated stress states on the development of nanotwins in the second-phase brass particles are discussed.",
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Effect of geometrical constraint condition on the formation of nanoscale twins in the Ni-based metallic glass composite. / Lee, M. H.; Kim, B. S.; Kim, Do Hyang; Ott, R. T.; Sansoz, F.; Eckert, J.

In: Philosophical Magazine Letters, Vol. 94, No. 6, 03.06.2014, p. 351-360.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of geometrical constraint condition on the formation of nanoscale twins in the Ni-based metallic glass composite

AU - Lee, M. H.

AU - Kim, B. S.

AU - Kim, Do Hyang

AU - Ott, R. T.

AU - Sansoz, F.

AU - Eckert, J.

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AB - We investigated the effect of geometrically constrained stress-strain conditions on the formation of nanotwins in -brass phase reinforced Ni59Zr20 Ti16 Si2 Sn3 metallic glass (MG) matrix deformed under macroscopic uniaxial compression. The specific geometrically constrained conditions in the samples lead to a deviation from a simple uniaxial state to a multi-axial stress state, for which nanocrystallization in the MG matrix together with nanoscale twinning of the brass reinforcement is observed in localized regions during plastic flow. The nanocrystals in the MG matrix and the appearance of the twinned structure in the reinforcements indicate that the strain energy is highly confined and the local stress reaches a very high level upon yielding. Both the effective distribution of reinforcements on the strain enhancement of composite and the effects of the complicated stress states on the development of nanotwins in the second-phase brass particles are discussed.

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