Sopu, D. ; Albe, K. ; Eckert, J. (2018)
Metallic glass nanolaminates with shape memory alloys.
In: Acta Materialia, 159
doi: 10.1016/j.actamat.2018.08.034
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2018 |
| Autor(en): | Sopu, D. ; Albe, K. ; Eckert, J. |
| Art des Eintrags: | Bibliographie |
| Titel: | Metallic glass nanolaminates with shape memory alloys |
| Sprache: | Englisch |
| Publikationsjahr: | 22 August 2018 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Acta Materialia |
| Jahrgang/Volume einer Zeitschrift: | 159 |
| DOI: | 10.1016/j.actamat.2018.08.034 |
| URL / URN: | https://doi.org/10.1016/j.actamat.2018.08.034 |
| Kurzbeschreibung (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. |
| Freie Schlagworte: | Bulk metallic glass, Nanolaminates,Ductility, Structural rejuvenation, Size effect, Shape memory alloys, Molecular dynamics |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialmodellierung Zentrale Einrichtungen Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ) Zentrale Einrichtungen > Hochschulrechenzentrum (HRZ) > Hochleistungsrechner |
| Hinterlegungsdatum: | 25 Sep 2018 11:51 |
| Letzte Änderung: | 25 Sep 2018 11:51 |
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