Development of shear band structure during deformation of a Zr57Ti5Cu20Ni8Al10 bulk metallic glass

Hufnagel, T. C.; El-Deiry, Paul; Vinci, Richard P.

doi:10.1016/s1359-6462(00)00527-3

Cited by 119 publications

(54 citation statements)

References 12 publications

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“…Moreover, the tensile fracture surface of the sample usually consists of a smooth region caused by sliding shear and a micron-scaled vein-like pattern region caused by subsequent catastrophic failure [24]. The smooth region corresponds to the critical shear displacement for crack nucleation occurring in shear bands [25][26][27]. This shear displacement is, to some extent, proportional to the plastic deflection [19,23].…”

Section: Resultsmentioning

confidence: 99%

Shear transformation zone volume determining ductile–brittle transition of bulk metallic glasses

et al. 2011

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Three-point bending experiments were performed on as-cast and annealed samples of Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 (Vit105) bulk metallic glasses over a wide range of temperatures varying from room temperature (293 K) to liquid nitrogen temperature (77 K). The results demonstrated that the free volume decrease due to annealing and/or cryogenic temperature can reduce the propensity for the formation of multiple shear bands and hence deteriorate plastic deformation ability. We clearly observed a sharp ductile-to-brittle transition (DBT), across which microscopic fracture feature transfers from micro-scale vein patterns to nano-scale periodic corrugations. Macroscopically, the corresponding fracture mode changes from ductile shear fracture to brittle tensile fracture. The shear transformation zone volume, taking into account free volume, temperature and strain rate, is proposed to quantitatively characterize the DBT behavior in fracture of metallic glasses.

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Section: Resultsmentioning

confidence: 99%

Shear transformation zone volume determining ductile–brittle transition of bulk metallic glasses

et al. 2011

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“…Below the glass-transition temperature, BMGs usually suffer a strong tendency for shear localization into ca. 10 nm thick shear bands [7][8][9][10][11][12][13] and undergo macroscopic brittle fracture [14][15][16][17]. However, there is clear evidence on the final fracture surfaces that BMGs are capable of legitimate plastic flow at the microscale [18][19][20].…”

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confidence: 99%

Nanoscale periodic corrugation to dimple transition due to “beat” in a bulk metallic glass

et al. 2010

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We report an intriguing observation that the interaction of brittle nanoscale periodic corrugations (NPCs) can lead to the formation of ductile dimples on the dynamic fracture surface of a tough Vit 1 bulk metallic glass (BMG) under high-velocity plate impact. A "beat" phenomenon due to superposition of simple harmonic vibrations, approximately characterizing NPCs, is proposed to explain this unusual brittle-to-ductile transition. The present results agree well with our previously revealed energy dissipation mechanism in the fracture of BMGs.

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“…However, inhomogeneous flow of metallic glasses at room temperature is generally associated with highly localized shear bands [6,7] . The formation and interaction of shear bands control the mechanical properties, such as ductility and fracture toughness.…”

Section: Pile-up Around Indenter Is Usually Observed During Instrumenmentioning

confidence: 99%

Numerical study of pile-up in bulk metallic glass during spherical indentation

Dai

2008

Sci. China Ser. G-Phys. Mech. As

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Pile-up around indenter is usually observed during instrumented indentation tests on bulk metallic glass. Neglecting the pile-up effect may lead to errors in evaluating hardness, Young's modulus, stress-strain response, etc. Finite element analysis was employed to implement numerical simulation of spherical indentation tests on bulk metallic glass. A new model was proposed to describe the pile-up effect. By using this new model, the contact radius and hardness of Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 bulk metallic glass were obtained under several different indenter loads with pile-up, and the results agree well with the data generated by numerical simulation.bulk metallic glass, spherical indenter, pile-up, contact radius, hardness Due to the unique physical, mechanical, and chemical properties, bulk metallic glasses (BMGs) are considered to be a class of very promising structure materials and will be adopted for application in various fields, such as civil astronautics, civil aeronautics and defense [1][2][3][4][5] . However, inhomogeneous flow of metallic glasses at room temperature is generally associated with highly localized shear bands [6,7] . The formation and interaction of shear bands control the mechanical properties, such as ductility and fracture toughness. Recently, Wang et al. have shown that high density, frequent interacting and arresting events of shear bands can lead to super-plasticity of BMGs at room temperature [8] . However, when BMGs are loaded under an unconstrained condition, such as in uniaxial tension or simple shear, rather few of shear bands can be induced. Once the shear bands are formed, BMGs fail catastrophically within the main shear band and show little plasticity [9][10][11] , thus limiting the application of BMGs as engineering material. So, for the sake of perceiving the plastic instability behavior and applications in engineering, much effort has been devoted to the mechanism of formation and evolution of shear bands in BMGs [12][13][14][15][16][17][18]

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Development of shear band structure during deformation of a Zr57Ti5Cu20Ni8Al10 bulk metallic glass

Cited by 119 publications

References 12 publications

Shear transformation zone volume determining ductile–brittle transition of bulk metallic glasses

Shear transformation zone volume determining ductile–brittle transition of bulk metallic glasses

Nanoscale periodic corrugation to dimple transition due to “beat” in a bulk metallic glass

Numerical study of pile-up in bulk metallic glass during spherical indentation

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