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

TitleEffect of geometrical constraint condition on the formation of nanoscale twins in the Ni-based metallic glass composite
Publication TypeJournal Article
Year of Publication2014
AuthorsLee, MH, Kim, BS, Kim, DH, Ott, RT, Sansoz, F, Eckert, J
JournalPhilosophical Magazine Letters
Volume94
Pagination351-360
Date Published06
Type of ArticleArticle
ISBN Number0950-0839
Accession NumberWOS:000335883400004
Keywordsalloy, bulk amorphous metal, deformation, extrusion, flow, fracture, hydrostatic-pressure, materials, matrix composites, metallic glasses, nanocrystallization, powder metallurgy, rapidly solidified, shear bands, twinning, warm
Abstract

We investigated the effect of geometrically constrained stress-strain conditions on the formation of nanotwins in alpha-brass phase reinforced Ni59Zr20Ti16Si2Sn3 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.

DOI10.1080/09500839.2014.907509
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Structures and Dynamics