Ductile bulk metallic glass by controlling structural heterogeneities
Scudino, S. (Institute for Complex Materials)
Bian, J. J. (Xi'an Jiaotong University. School of Materials Science and Engineering)
Shakur Shahabi, H. (Heraeus Amorphous Metals, Heraeus Deutschland GmbH and Co)
Şopu, D. (Erich Schmid Institute of Materials Science, Austrian Academy of Sciences)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Eckert, Jürgen (Montanuniversität Leoben. Department Materials Physics)
Liu, G. (Xi'an Jiaotong University. School of Materials Science and Engineering)

Fecha:	2018
Resumen:	A prerequisite to utilize the full potential of structural heterogeneities for improving the room-temperature plastic deformation of bulk metallic glasses (BMGs) is to understand their interaction with the mechanism of shear band formation and propagation. This task requires the ability to artificially create heterogeneous microstructures with controlled morphology and orientation. Here, we analyze the effect of the designed heterogeneities generated by imprinting on the tensile mechanical behavior of the ZrTiCuNiAl BMG by using experimental and computational methods. The imprinted material is elastically heterogeneous and displays anisotropic mechanical properties: strength and ductility increase with increasing the loading angle between imprints and tensile direction. This behavior occurs through shear band branching and their progressive rotation. Molecular dynamics and finite element simulations indicate that shear band branching and rotation originates at the interface between the heterogeneities, where the characteristic atomistic mechanism responsible for shear banding in a homogeneous glass is perturbed.
Ayudas:	European Commission 340025 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-292
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Glasses ; Mechanical properties
Publicado en:	Scientific reports, Vol. 8 (June 2018) , art. 9174, ISSN 2045-2322

DOI: 10.1038/s41598-018-27285-5
PMID: 29907778

12 p, 6.2 MB

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