Nanoindentation studies of shear banding in fully amorphous and partially devitrified metallic alloys

Greer, A. Lindsay; Castellero, Alberto; Madge, S.V.; Walker, I.T.; Wilde, Juergen

doi:10.1016/j.msea.2003.10.032

Cited by 143 publications

(76 citation statements)

References 13 publications

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“…11 Recently, several authors have studied the mechanisms of plastic deformation in BMGs by means of nanoindentation. [12][13][14][15][16][17] In nanoindentation of BMGs, plastic deformation is manifested as pop-in events on the load-displacement curves during loading. 12 These serrations, which are more pronounced for low loading rates, have been related to the formation and propagation of shear bands.…”

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“…12 These serrations, which are more pronounced for low loading rates, have been related to the formation and propagation of shear bands. [14][15][16][17] Although plastic deformation during nanoindentation has been studied to some extent in BMGs, time-dependent deformation effects have generally been overlooked. Apart from its fundamental interest, the creep of submicrometer contacts is also of clear practical significance.…”

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Anelastic deformation of a Pd40Cu30Ni10P20 bulk metallic glass during nanoindentation

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Greer

et al. 2006

Applied Physics Letters

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Time-dependent deformation processes during nanoindentation have been investigated on a Pd40Cu30Ni10P20 bulk metallic glass. Deformation under constant load has been studied as a function of prior loading rate and temperature. The constant-load displacement of the indenter into the sample shows classic relaxation kinetics and reveals the importance of anelasticity for the mechanical behavior of metallic glasses at the nanoscale.

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Anelastic deformation of a Pd40Cu30Ni10P20 bulk metallic glass during nanoindentation

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et al. 2006

Applied Physics Letters

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“…Alloy ingots with a nominal composition of Ti 45 Zr 16 Be 20 Cu 10 Ni 9 were prepared by arc-melting mixtures of pure Ti, Zr, Cu, Ni and Be with a purity greater than 99.9% in Ti gettered argon atmosphere. The ingots were remelted five times to ensure chemical homogeneity.…”

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“…It is now well established that serrations are associated with shear band nucleation and propagation. A growing number of authors considered that the formation of individual shear bands by nanoindentation, where displacements burst in the load-displacement (p-h) response have been correlated with discrete shear banding events [14,16]. Schuh et al demonstrated extensively that discrete flow was strongly dependent not only on the chemical composition of the BMGs but also on indentation loading rate [2,14,17,18], that is the serrations in the p-h curve are more pronounced at lower loading rates and vanish or become less prominent with increasing loading rate.…”

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Rate-dependent serrated flow and plastic deformation in Ti₄₅Zr₁₆Be₂₀Cu₁₀Ni₉bulk amorphous alloy during nanoindentation

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Sohn

Kim

et al. 2008

Science and Technology of Advanced Materials

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The plastic deformation of Ti 45 Zr 16 Be 20 Cu 10 Ni 9 bulk metallic glass has been investigated by nanoindentation performed with loads ranging from 10 to 200 mN in a wide range of loading rates. The plastic flow in the alloy exhibited conspicuous serrations at low loading rates. The serrations, however, became less prominent as the rate of indentation increased. Atomic force microscopy showed a significant pile-up of materials around the indents, indicating that a highly localized plastic deformation occurred under nanoindentation. The possible mechanism governing the plastic deformation in bulk metallic glass specimens is tentatively discussed in terms of strain-induced free volume.

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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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Nanoindentation studies of shear banding in fully amorphous and partially devitrified metallic alloys

Cited by 143 publications

References 13 publications

Anelastic deformation of a Pd40Cu30Ni10P20 bulk metallic glass during nanoindentation

Anelastic deformation of a Pd40Cu30Ni10P20 bulk metallic glass during nanoindentation

Rate-dependent serrated flow and plastic deformation in Ti₄₅Zr₁₆Be₂₀Cu₁₀Ni₉bulk amorphous alloy during nanoindentation

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

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Nanoindentation studies of shear banding in fully amorphous and partially devitrified metallic alloys

Cited by 143 publications

References 13 publications

Anelastic deformation of a Pd40Cu30Ni10P20 bulk metallic glass during nanoindentation

Anelastic deformation of a Pd40Cu30Ni10P20 bulk metallic glass during nanoindentation

Rate-dependent serrated flow and plastic deformation in Ti45Zr16Be20Cu10Ni9bulk amorphous alloy during nanoindentation

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

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Rate-dependent serrated flow and plastic deformation in Ti₄₅Zr₁₆Be₂₀Cu₁₀Ni₉bulk amorphous alloy during nanoindentation