Plasticity in small-sized metallic systems: Intrinsic versus extrinsic size effect

Greer, Julia R.; Hosson, J.Th.M. De

doi:10.1016/j.pmatsci.2011.01.005

Cited by 1,554 publications

(987 citation statements)

References 196 publications

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“…22 Plasticity of micro/nano-pillars has been extensively studied in recent years. 22,23 In general, strength increases as the pillar diameter decreases. For micropillars, plasticity occurs through the activation of single-arm sources (or truncated Frank-Read sources).…”

Section: Resultsmentioning

confidence: 99%

Size effects on elasticity, yielding, and fracture of silver nanowires:In situexperiments

et al. 2012

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This paper reports the first quantitative measurement of a full spectrum of mechanical properties of five-fold twinned silver (Ag) nanowires (NWs) including Young's modulus, yield strength and ultimate tensile strength. In situ tensile testing of Ag NWs with diameters between 34 and 130 nm was carried out inside a scanning electron microscope (SEM). Young's modulus, yield strength and ultimate tensile strength all increased as the NW diameter decreased. The maximum yield strength in our tests was found to be 2.64 GPa, which is about 50 times the bulk value and close to the theoretical value of Ag in the <110> orientation. The size effect in the yield strength is attributed to the increase in the Young's modulus. Yield strain scales reasonably well with the NW surface area, which reveals that yielding of Ag NWs is due to dislocation nucleation from surface sources. Pronounced strain hardening was observed for most NWs in our study. The strain hardening, which has not previously been reported for NWs, is mainly attributed to the presence of internal twin boundaries. KEYWORDSfive-fold twin, size effect, Young's modulus, yield strength, ultimate tensile strength, strain hardening

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Section: Resultsmentioning

confidence: 99%

Size effects on elasticity, yielding, and fracture of silver nanowires:In situexperiments

et al. 2012

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“…Instead, dual-phase alloys of Al-Al 19 Gd 3 Ni 5 , Al-Al 3 Gd and Al-Al 9 Co 2 with microscale phase dimensions were produced, and Vickers hardness and nanoindentation were used to determine their resistance to failure in microscale and nanoscale volumes (Table 1 and Supplementary Table S2). The nanohardness linearly scales with the yield strength of nanoscale pillars 28 and can thus represent the effect of the nanoscale dimension of the phases on strength. Furthermore, according to the rule of mixture, the composite effect on strength can be estimated based on the measured nanohardness and volume fraction.…”

Section: Strengthening Mechanismmentioning

confidence: 99%

Hybrid nanostructured aluminum alloy with super-high strength

Wang

Scudino

et al. 2015

NPG Asia Mater

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Methods to strengthen aluminum alloys have been employed since the discovery of the age-hardening phenomenon in 1901. The upper strength limit of bulk Al alloys is~0.7 GPa by conventional precipitation strengthening and increases to 41 GPa through grain refinement and amorphization. Here we report a bulk hybrid nanostructured Al alloy with high strength at both room temperature and elevated temperatures. In addition, based on high-resolution transmission electron microscopic observations and theoretical analysis, we attribute the strengthening mechanism to the composite effect of the high-strength nanocrystalline fcc-Al and nano-sized intermetallics as well as to the confinement effect between these nano phases. We also report the plastic deformation of nano-sized intermetallics and the occurrence of a high density of stacking faults and twins in fcc-Al after low-strain-rate deformation at room and high temperatures. Our findings may be beneficial for designing highstrength materials for advanced structural applications.

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“…17 For a review and details reference is made to. 21 The frequency of bursts increases rapidly with decreasing pillar diameter ͓power-law, Fig. 4͑b͔͒.…”

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confidence: 95%

In situ compression study of taper-free metallic glass nanopillars

Kuzmin

Pei

Hosson

2011

Applied Physics Letters

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Because tapering leads to inevitable artifacts in the analyses of compression experiments on micrometer sized pillars, in this study taper-free nanosized pillars of Zr-based metallic glass of Zr 61.8 Cu 18 Ni 10.2 Al 10 composition with diameter ranging from 600 to 90 nm were fabricated. These pillars were compressed in situ in a transmission electron microscope as a function of pillar diameter. Under compression each pillar of large diameter exhibits predominant inhomogeneous and intermittent plastic flow characterized by shear banding ͑SB͒ events. However, pillars around 150 nm in diameter and below show homogeneous deformation during compression without SB.

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Plasticity in small-sized metallic systems: Intrinsic versus extrinsic size effect

Cited by 1,554 publications

References 196 publications

Size effects on elasticity, yielding, and fracture of silver nanowires:In situexperiments

Size effects on elasticity, yielding, and fracture of silver nanowires:In situexperiments

Hybrid nanostructured aluminum alloy with super-high strength

In situ compression study of taper-free metallic glass nanopillars

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