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

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Date
2014
Volume
94
Issue
6
Journal
Series Titel
Book Title
Publisher
Milton Park : Taylor and Francis Ltd.
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.

Description
Keywords
metallic glasses, nanocrystallization, powder metallurgy, rapidly solidified materials, twinning, Brass, Glass, Nanocrystallization, Nanotechnology, Powder metallurgy, Rapid solidification, Reinforcement, Twinning, Constrained conditions, Effective distribution, Geometrical constraints, Multiaxial stress state, Ni-based metallic glass, Rapidly solidified materials, Stress-strain condition, Uni-axial compression, Metallic glass
Citation
Lee, M. H., Kim, B. S., Kim, D. H., Ott, R. T., Sansoz, F., & Eckert, J. (2014). Effect of geometrical constraint condition on the formation of nanoscale twins in the Ni-based metallic glass composite. 94(6). https://doi.org//10.1080/09500839.2014.907509
License
CC BY-NC 3.0 Unported