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Metallic glass nanolaminates with shape memory alloys

Sopu, D. and Albe, K. and Eckert, J. (2018):
Metallic glass nanolaminates with shape memory alloys.
In: Acta Materialia, pp. 344-351, 159, ISSN 13596454,
DOI: 10.1016/j.actamat.2018.08.034,
[Online-Edition: https://doi.org/10.1016/j.actamat.2018.08.034],
[Article]

Abstract

We model the deformation behavior of metallic amorphous Cu_64Zr_36/crystalline B2 CuZr nanolaminate systems using molecular-dynamics computer simulations. Amorphous-crystalline nanolaminates with shape memory alloys may be a material class which is combining the advantageous properties of metallic glasses with large-strain homogeneous flow at low temperatures and high stresses. We find that the deformation of the glassy and crystalline phases is a coupled process: martensitic transformation leads to shear band formation while the stress at the shear band tip induces martensitic transformation in the shape memory crystal. Moreover, the martensitic transformation changes the shear band morphology, stabilizes the shear flow and avoids a runaway instability. Finally, the critical volume fraction of the B2 layer for which the composite laminate shows a brittle-to-ductile transition is identified. The value of the critical volume fraction can be further decreased when the structure of the metallic glass is rejuvenated. Therefore, tailoring the architecture of metallic glass laminates with shape memory phases may allow the development of materials that exhibit large tensile ductility.

Item Type: Article
Erschienen: 2018
Creators: Sopu, D. and Albe, K. and Eckert, J.
Title: Metallic glass nanolaminates with shape memory alloys
Language: English
Abstract:

We model the deformation behavior of metallic amorphous Cu_64Zr_36/crystalline B2 CuZr nanolaminate systems using molecular-dynamics computer simulations. Amorphous-crystalline nanolaminates with shape memory alloys may be a material class which is combining the advantageous properties of metallic glasses with large-strain homogeneous flow at low temperatures and high stresses. We find that the deformation of the glassy and crystalline phases is a coupled process: martensitic transformation leads to shear band formation while the stress at the shear band tip induces martensitic transformation in the shape memory crystal. Moreover, the martensitic transformation changes the shear band morphology, stabilizes the shear flow and avoids a runaway instability. Finally, the critical volume fraction of the B2 layer for which the composite laminate shows a brittle-to-ductile transition is identified. The value of the critical volume fraction can be further decreased when the structure of the metallic glass is rejuvenated. Therefore, tailoring the architecture of metallic glass laminates with shape memory phases may allow the development of materials that exhibit large tensile ductility.

Journal or Publication Title: Acta Materialia
Volume: 159
Uncontrolled Keywords: Bulk metallic glass, Nanolaminates,Ductility, Structural rejuvenation, Size effect, Shape memory alloys, Molecular dynamics
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
Zentrale Einrichtungen
Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ)
Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ) > Hochleistungsrechner
Date Deposited: 25 Sep 2018 11:51
DOI: 10.1016/j.actamat.2018.08.034
Official URL: https://doi.org/10.1016/j.actamat.2018.08.034
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