Deformation in a Zr57Ti5Cu20Ni8Al10 bulk metallic glass during nanoindentation

Fuqian Yang; Kebin Geng; Peter K. Liaw; Guojiang Fan; Hahn Choo

doi:10.1016/j.actamat.2006.06.063

Deformation in a Zr₅₇Ti₅Cu₂₀Ni₈Al₁₀ bulk metallic glass during nanoindentation

Fuqian Yang
, Kebin Geng
, Peter K. Liaw
, Guojiang Fan
, Hahn Choo

Producción científica: Article › revisión exhaustiva

78 Citas (Scopus)

Resumen

Nanoindentation experiments of a Zr₅₇Ti₅Cu₂₀Ni₈Al₁₀ bulk metallic glass were performed with indentation loads ranging from 200 to 2000 μN. Both the indentation hardness and the reduced contact modulus decreased with the increase in the indentation load due to the propagation of shear bands underneath the indenter - the occurrence of a softening effect. The ratio of the indentation hardness to the reduced contact stiffness was a function of the reciprocal of the indentation depth. Based on the concept of diffusion-induced stresses, a one-dimensional constitutive relation between the change of the excessive free volume and the flow stress was proposed. The indentation-size effect as observed in the indentation tests was explained through the consideration of the contribution of the strain gradient in the constitutive relation.

Idioma original	English
Páginas (desde-hasta)	321-327
Número de páginas	7
Publicación	Acta Materialia
Volumen	55
N.º	1
DOI	https://doi.org/10.1016/j.actamat.2006.06.063
Estado	Published - ene 2007

Nota bibliográfica

Funding Information:
The authors are grateful to Professor W.D. Nix (Stanford University) for valuable discussions. F.Y. is grateful for support from the NSF grant CMS-0508989 and the support from General Motors Corporation. P.K.L. and G.F. are supported by the International Materials Institutes (IMI) program, DMR-0231320, with Dr C. Huber as the program director.

Financiación

The authors are grateful to Professor W.D. Nix (Stanford University) for valuable discussions. F.Y. is grateful for support from the NSF grant CMS-0508989 and the support from General Motors Corporation. P.K.L. and G.F. are supported by the International Materials Institutes (IMI) program, DMR-0231320, with Dr C. Huber as the program director.

Financiadores	Número del financiador
National Science Foundation (NSF)	CMS-0508989
General Motors Corporation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2006.06.063

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title = "Deformation in a Zr57Ti5Cu20Ni8Al10 bulk metallic glass during nanoindentation",

abstract = "Nanoindentation experiments of a Zr57Ti5Cu20Ni8Al10 bulk metallic glass were performed with indentation loads ranging from 200 to 2000 μN. Both the indentation hardness and the reduced contact modulus decreased with the increase in the indentation load due to the propagation of shear bands underneath the indenter - the occurrence of a softening effect. The ratio of the indentation hardness to the reduced contact stiffness was a function of the reciprocal of the indentation depth. Based on the concept of diffusion-induced stresses, a one-dimensional constitutive relation between the change of the excessive free volume and the flow stress was proposed. The indentation-size effect as observed in the indentation tests was explained through the consideration of the contribution of the strain gradient in the constitutive relation.",

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AU - Liaw, Peter K.

AU - Fan, Guojiang

AU - Choo, Hahn

N1 - Funding Information: The authors are grateful to Professor W.D. Nix (Stanford University) for valuable discussions. F.Y. is grateful for support from the NSF grant CMS-0508989 and the support from General Motors Corporation. P.K.L. and G.F. are supported by the International Materials Institutes (IMI) program, DMR-0231320, with Dr C. Huber as the program director.

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N2 - Nanoindentation experiments of a Zr57Ti5Cu20Ni8Al10 bulk metallic glass were performed with indentation loads ranging from 200 to 2000 μN. Both the indentation hardness and the reduced contact modulus decreased with the increase in the indentation load due to the propagation of shear bands underneath the indenter - the occurrence of a softening effect. The ratio of the indentation hardness to the reduced contact stiffness was a function of the reciprocal of the indentation depth. Based on the concept of diffusion-induced stresses, a one-dimensional constitutive relation between the change of the excessive free volume and the flow stress was proposed. The indentation-size effect as observed in the indentation tests was explained through the consideration of the contribution of the strain gradient in the constitutive relation.

AB - Nanoindentation experiments of a Zr57Ti5Cu20Ni8Al10 bulk metallic glass were performed with indentation loads ranging from 200 to 2000 μN. Both the indentation hardness and the reduced contact modulus decreased with the increase in the indentation load due to the propagation of shear bands underneath the indenter - the occurrence of a softening effect. The ratio of the indentation hardness to the reduced contact stiffness was a function of the reciprocal of the indentation depth. Based on the concept of diffusion-induced stresses, a one-dimensional constitutive relation between the change of the excessive free volume and the flow stress was proposed. The indentation-size effect as observed in the indentation tests was explained through the consideration of the contribution of the strain gradient in the constitutive relation.

KW - Metallic glass

KW - Nanoindentation

KW - Shear bands

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