Deformation Mechanisms of the Zr&lt;SUB&gt;&lt;B&gt;40&lt;/B&gt;&lt;/SUB&gt;Ti&lt;SUB&gt;&lt;B&gt;14&lt;/B&gt;&lt;/SUB&gt;Ni&lt;SUB&gt;&lt;B&gt;10&lt;/B&gt;&lt;/SUB&gt;Cu&lt;SUB&gt;&lt;B&gt;12&lt;/B&gt;&lt;/SUB&gt;Be&lt;SUB&gt;&lt;B&gt;24&lt;/B&gt;&lt;/SUB&gt; Bulk Metallic Glass

Wright, Wendelin J.; Saha, Rajarshi; Nix, William D.

doi:10.2320/matertrans.42.642

Cited by 348 publications

(118 citation statements)

References 21 publications

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“…2 The importance of shear bands in plastic deformation of BMGs is emphasized by recent results on BMG composite materials, where the interception of shear bands by a dispersed second phase impacts the global deformation response and can substantially increase tensile ductility. [7][8][9] Although serrated flow of BMGs is most commonly observed under uniaxial compression, [2][3][4][5][6] it has also been observed under more complex stress states. For example, Kimura and Masumoto 10,11 have measured displacement bursts during mode-I crack opening experiments on a Pd-6Cu-16Si amorphous metal, and observed the development of shear bands on the exposed surfaces of specimens during testing.…”

Section: Introductionmentioning

confidence: 99%

“…Recent investigations by Wright et al 2 and Golovin et al 14 have pointed out that nanoindentation may be used to probe details of serrated flow behavior in BMGs. Working with a Zr-based BMG, Wright et al 2 observed the onset of plastic flow during nanoindentation as a discontinuity in the load-displacement curve, and attributed this "pop-in" to the nucleation of a shear band beneath the indenter tip.…”

Section: Introductionmentioning

confidence: 99%

“…For example, after the yield stress has been reached during quasi-static compression of Pd-or Zr-based BMGs, serrated plastic flow is observed, where the stress-strain curve is not smooth, but punctuated by many small load drops. [2][3][4][5][6] These serrations have been correlated with the motion of individual shear bands through the specimen, where each contributes a small increment of plastic strain to the macroscopic stress-strain curve. 2 The importance of shear bands in plastic deformation of BMGs is emphasized by recent results on BMG composite materials, where the interception of shear bands by a dispersed second phase impacts the global deformation response and can substantially increase tensile ductility.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5][6] These serrations have been correlated with the motion of individual shear bands through the specimen, where each contributes a small increment of plastic strain to the macroscopic stress-strain curve. 2 The importance of shear bands in plastic deformation of BMGs is emphasized by recent results on BMG composite materials, where the interception of shear bands by a dispersed second phase impacts the global deformation response and can substantially increase tensile ductility. [7][8][9] Although serrated flow of BMGs is most commonly observed under uniaxial compression, [2][3][4][5][6] it has also been observed under more complex stress states.…”

Section: Introductionmentioning

confidence: 99%

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Rate Dependence of Serrated Flow During Nanoindentation of a Bulk Metallic Glass

2002

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Plastic deformation of Pd-40Ni-20P bulk metallic glass (BMG) was investigated by instrumented nanoindentation experiments over a broad range of indentation strain rates. At low rates, the load-displacement curves during indentation exhibited numerous serrations or pop-ins, but these serrations became less prominent as the indentation rate was increased. Using the tip velocity during pop-in as a gauge of serration activity, we found that serrated flow is only significant at indentation strain rates below about 1-10/s. This result suggests a transition in plastic flow behavior at high strain rates, in agreement with prior studies of BMGs under different modes of loading.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rate Dependence of Serrated Flow During Nanoindentation of a Bulk Metallic Glass

2002

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“…The highly localized heterogeneous deformation behaviour of the BMG samples is usually manifested by serrated plastic flow [3][4][5][6]. After yielding, plastic flow is observed by irregular and regular serrations that are characterized by sudden load/stress drops separated by elastic reloading.…”

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confidence: 99%

Complexity of shear localization in a Zr-based bulk metallic glass

et al. 2009

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Observation of Instabilities during Plastic Deformation by in‐situ SEM Indentation Experiments

et al. 2005

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The plastic deformation behaviour of materials has great significance for metal forming processes as well as for safety in structural design. A detailed understanding of instabilities during plastic deformations and of the underlying mechanisms is of great importance for the design of materials with stable plastic deformation and high ductility. We here present first results on the observation of pop-ins and shear band formation during indentation in a Zr-based bulk metallic glass (Vitreloy-105) with the nominal composition Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 . We concentrate thereby on observations from in-situ scanning electron microscopy (SEM) experiments using a recently developed miniaturized instrumented indentation system that can be used inside the SEM chamber. We found, for the first time, a partial correlation between displacement bursts in the load-displacement curve and shear band activity at the specimen surface. Frames from video sequences with the respective load displacement curve are presented as evidence.Metallic glasses are known for over 40 years now. Klement et al. have prepared the first metallic glass in the year 1960. [1] The glass forming process in these metals required cooling rates in the range of 10 6 Ks ±1 , which could not be reached in bulk materials. Therefore, and despite attractive mechanical properties, structural applications were not possible. New and better glass forming compositions have been found since and the necessary cooling rates have dropped considerably to reach 1 Ks ±1 today and components several mm thick can now be cast routinely. [2] The high hardness, good wear and corrosion resistance and a toughness greater than ceramics make bulk metallic glasses (BMGs) attractive materials for structural applications. [3] However, plastic deformation of BMGs is highly unstable and their ductility, particularly in tension, is very limited. [4±9] Plastic deformation is highly localized inside shear bands. In tension, ductility is often so low that only a single dominant shear band develops, which leads to specimen failure. However, extensive shear banding can be observed in compression, bending or indentation tests. A thorough understanding of the plastic deformation is necessary in order to increase tensile ductility in these materials.

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Deformation Mechanisms of the Zr<SUB><B>40</B></SUB>Ti<SUB><B>14</B></SUB>Ni<SUB><B>10</B></SUB>Cu<SUB><B>12</B></SUB>Be<SUB><B>24</B></SUB> Bulk Metallic Glass

Cited by 348 publications

References 21 publications

Rate Dependence of Serrated Flow During Nanoindentation of a Bulk Metallic Glass

Rate Dependence of Serrated Flow During Nanoindentation of a Bulk Metallic Glass

Complexity of shear localization in a Zr-based bulk metallic glass

Observation of Instabilities during Plastic Deformation by in‐situ SEM Indentation Experiments

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