Effects of specimen geometry and base material on the mechanical behavior of focused-ion-beam-fabricated metallic-glass micropillars

Yang, Yong; Ye, J.C.; J, Lu; Liu, F.X.; Liaw, Peter K.

doi:10.1016/j.actamat.2008.11.043

Cited by 71 publications

(46 citation statements)

References 42 publications

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“…That is, the side of the nanopillar and the top surface are connected by an arc surface with a curvature radius in the amount of $50 nm. The effect of this configuration has not been considered in the work of Zhang et al [33], nor has it been addressed in the more recent work of Schuster et al [2] and Yang et al [35]. This should not be of great concern for relatively large pillars whereby the curved connection only accounts for a small portion of the whole specimen.…”

Section: Plastic Deformation Of Vit 1 Nanopillarsmentioning

confidence: 90%

Prevalence of shear banding in compression of Zr41Ti14Cu12.5Ni10Be22.5 pillars as small as 150 nm in diameter

Guo

Wei

et al. 2009

Acta Materialia

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Recently, the size dependence of mechanical behaviors, particularly the yield strength and plastic deformation mode, of bulk metallic glasses (BMG) has created a great deal of interest. Contradicting conclusions have been drawn by different research groups, based on various experiments on different BMG systems. Based on in situ compression transmission electron microscopy (TEM) experiments on Zr 41 Ti 14 Cu 12.5 Ni 10 Be 22.5 (Vit 1) nanopillars, this paper provides strong evidence that shear banding still prevails at specimen length scales as small as 150 nm in diameter. This is supported by in situ and ex situ images of shear bands, and by the carefully recorded displacement bursts under load control as well as load drops under displacement control. Finite element modeling of the stress state within the pillar shows that the unavoidable geometry constraints accompanying such experiments impart a strong effect on the experimental results, including non-uniform stress distributions and high level hydrostatic pressures. The seemingly improved compressive ductility is believed to be due to such geometry constraints. Observations underscore the notion that the mechanical behavior of metallic glasses, including strength and plastic deformation mode, is size independent at least in Vit 1.

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Section: Plastic Deformation Of Vit 1 Nanopillarsmentioning

confidence: 90%

Prevalence of shear banding in compression of Zr41Ti14Cu12.5Ni10Be22.5 pillars as small as 150 nm in diameter

Guo

Wei

et al. 2009

Acta Materialia

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“…0021-8979/2012/112(5)/053516/9/$30.00 V C 2012 American Institute of Physics 112, 053516-1 micropillar preparation are described elsewhere 11 and omitted here for brevity. After the FIB milling, the microcompression tests were carried out at the nominal strain rate of $5 Â 10 À3 s À1 on the same Hysitron TM nanoindentation system equipped with a 10 lm flat-end diamond tip.…”

Section: Materials and Experimentsmentioning

confidence: 99%

“…compliance 11 Subsequently, the elastic modulus of the TFMG top-layer can be obtained by subtracting the stiffness of the Si substrate out of the total stiffness of the micropillar. The details of the underlying mechanics have also been discussed in Ref.…”

Section: -3mentioning

confidence: 99%

Hardness, yield strength, and plastic flow in thin film metallic-glass

Chu

Chen

et al. 2012

Journal of Applied Physics

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Lithiation-induced tensile stress and surface cracking in silicon thin film anode for rechargeable lithium battery J. Appl. Phys. 112, 093507 (2012) Mechanical and thermal behaviors of nitrogen-doped Zr-Cu-Al-Ag-Ta--An alternative class of thin film metallic glass Appl. Phys. Lett. 101, 181902 (2012) Effect of relative humidity on crack propagation in barrier films for flexible electronics J. Appl. Phys. 112, 083520 (2012) Torsion fracture of carbon nanocoils J. Appl. Phys. 112, 084311 (2012) Additional information on J. Appl. Phys. Thin film metallic-glasses (TFMGs) are a promising structural material for fabricating the next generation of micro-and nano-devices; however, a comprehensive study is still lacking today for understanding their mechanical behaviors. In this article, we present a systematic study on the Zr 53 Cu 29 Al 12 Ni 6 TFMGs with varying thicknesses. Other than the intrinsic factor of structural amorphousness, our study pinpoints other extrinsic variables that could affect the hardness and yield strength of the TFMGs. Furthermore, the experimental results from microcompression show that the plastic flow in the TFMG-based micropillars exhibit strong sample size-and-shape dependence, which manifests as a smooth plastic deformation transition from the inhomogeneous to homogeneous mode when the TFMG-based micropillars with a submicron-scale film thickness are deformed into the shape of a low aspect ratio. V C 2012 American Institute of Physics.

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“…Before the FIB treatment, the BMGs were checked using x-ray diffraction to ensure their amorphous structure (not shown here) and then mechanically polished to a mirror finish on their surfaces. The details of the FIB milling have been described elsewhere 4,13 and a total of 31 micropillars was fabricated on the BMG samples with the diameter and aspect ratio ranging from $1 to $2 lm and 2:1 to 4:1, respectively. Afterwards, microcompression experiments were conducted on the modified Hysitron TM nanoindentation system, which has the resolution of $1 nm in displacement and $1 lN in load and was then equipped with a 10-lm flatend diamond punch.…”

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confidence: 99%