2007
DOI: 10.1063/1.2800313
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Sample size effect and microcompression of Mg65Cu25Gd10 metallic glass

Abstract: Micropillars with diameters of 1 and 3.8 m were fabricated from Mg-based metallic glasses using focus ion beam, and then tested in compression at strain rates ranging from 6 ϫ 10 −5 to 6 ϫ 10 −1 s −1. The apparent yield strength of the micropillars is 1342-1580 MPa, or 60%-100% increment over the bulk specimens. This strength increase can be rationalized using the Weibull statistics for brittle materials, and the Weibull modulus of the Mg-based metallic glasses is estimated to be about 35. Preliminary results … Show more

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Cited by 139 publications
(120 citation statements)
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“…13,14) Apparent strength increment and different ductility performance of such crystalline materials in micro-or submicro-scale have been discussed in terms of dislocation starvation. For the isotropic amorphous BMGs, stress increments in micro-sized pillars have also been found in the Mg 15,16) and Zr 17,18) based BMGs. Due to the high electrical conductivity, high oxidation and corrosion resistance of the Au based alloys, the Au based BMGs are regarded as potential materials in MEMS application.…”
Section: Introductionmentioning
confidence: 87%
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“…13,14) Apparent strength increment and different ductility performance of such crystalline materials in micro-or submicro-scale have been discussed in terms of dislocation starvation. For the isotropic amorphous BMGs, stress increments in micro-sized pillars have also been found in the Mg 15,16) and Zr 17,18) based BMGs. Due to the high electrical conductivity, high oxidation and corrosion resistance of the Au based alloys, the Au based BMGs are regarded as potential materials in MEMS application.…”
Section: Introductionmentioning
confidence: 87%
“…2(a) and (b). Following the correction for the taper effect as reported in our previous paper, 15) the elastic modulus of this pillar is calculated to be 56 GPa. Due to the compliance of the substrate, the actual Young's moduls should be further corrected by a factor of 1.25 according to a finite element analysis of micro-compression.…”
Section: Resultsmentioning
confidence: 99%
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“…6 Another issue of concerns is that tapering is inevitable for FIB-milled MG pillars with diameters down to submicrometer scale, as highly localized SBs may preferentially nucleate at the corner of sample-plunger contact during compression. [7][8][9][10][11][12][13][14][15] In literature tapering angles range between 2°-3.5°and 7°-15°and may cause that the deformation always starts at the top leading to the so-called mushrooming effect. Our previous study has shown that tapering has a large influence on the deformation behavior making stress analysis rather difficult.…”
mentioning
confidence: 99%
“…After the microfabrication procedure described in the literature, 4,[8][9][10] micropillars were carved out using the focused-ion beams on the surface of a Zr 50 Cu 37 Al 10 Pd 3 (in at.%) disk 3 mm in diameter. For the solid ones, the diameters ranged from $0.7 to $6 mm, and the aspect ratio ranged from 2:1 to 9:1.…”
mentioning
confidence: 99%