Sample size matters for Al88Fe7Gd5 metallic glass: Smaller is stronger

Wang, C.-C.; Ding, Jing; Cheng, Yongqiang; Wan, Jingchun; Tian, Lin; Sun, Jun; Shan, ZW; Li, Ju; Ma, Evan

doi:10.1016/j.actamat.2012.06.019

Cited by 111 publications

(55 citation statements)

References 48 publications

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“…The shear offsets seen on the pillars' surfaces in the accompanying micrographs suggest that the pop-ins in these stress-strain curves correspond to shear banding events. That these pillars deform by shear localization is consistent with past reports on the microcompression testing of metallic glass pillars with diameters [1 lm [41][42][43][44]. In most tests, only a single pop-in was observed, followed by pillar failure but occasionally tests captured multiple pop-in events, separated by regions of continued elastic deformation.…”

Section: Resultssupporting

confidence: 78%

Micropillar compression testing of powders

et al. 2015

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An experimental design for microcompression on individual powder particles is proposed as a means of testing novel materials without the challenges associated with consolidation to produce bulk specimens. This framework is demonstrated on an amorphous tungsten alloy powder, and yields reproducible measurements of the yield strength (4.5 ± 0.3 GPa) and observations of the deformation mode (in this case, serrated flow by shear localization).

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Section: Resultssupporting

confidence: 78%

Micropillar compression testing of powders

et al. 2015

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“…The actual elastic energy release during the load drop caused by the propagation of shear band instead of total energy stored in the sample is used in this model. It was interesting to note that the resulting simple power law fits other published strength data for a number of MG systems, too (see Figure 3 [22]). [14], [20], and [21] respectively.…”

Section: Strength-size Relationshipmentioning

confidence: 59%

“…They demonstrated that when the sample size falls in between 100 nm to a few micron meters, Al 88 Fe 7 Gd 5 MG does exhibit obvious size strengthening behavior. In view of their experiment data, Wang et al [22] proposed a shifted-D −0.5 power law dependence of strength with decreasing sample diameter based on a modified energy-balance model to explain the stress-size relationship. The actual elastic energy release during the load drop caused by the propagation of shear band instead of total energy stored in the sample is used in this model.…”

Section: Strength-size Relationshipmentioning

confidence: 99%

“…[29] Zr-based Compression Independence 90 nm − 600 nm Chen et al [21] [30] Cu-based Compression Independence 70 nm − 645 nm Kuzmin et al [31,32] Al-based Compression Independence 110 nm − 900 nm The literature strength data used in this plot are all for samples that exhibited shear banding as the controlling mode for yielding. [22] Compared to crystalline materials, MGs have superior elastic limit. [33] If MGs indeed have size strengthening, one reasonable speculation is that much higher elastic strain should be measured in micronanoscaled samples, as predicted by the theoretical prediction.…”

Section: Strength-size Relationshipmentioning

confidence: 99%

“…Figure 2(c) [21]). In order to resolve this dispute, Wang et al [22] carried out a systematic study on Al 88 Fe 7 Gd 5 MG by employing in situ compression tests on pillars in both Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) and in situ uniaxial tensile tests inside TEM. They demonstrated that when the sample size falls in between 100 nm to a few micron meters, Al 88 Fe 7 Gd 5 MG does exhibit obvious size strengthening behavior.…”

Section: Strength-size Relationshipmentioning

confidence: 99%

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Mechanical Behavior of Micronanoscaled Metallic Glasses

Tian

Wang

Shan

2016

Materials Research Letters

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In this paper, research on the mechanical behavior of micronanoscaled metallic glasses (MGs) is reviewed, with an emphasis on works achieved through in situ transmission electron microscope. It was found that the strength of micronanoscaled MGs has a nonlinear dependence on sample size. Corresponding to the transition of size-dependent strength, the deformation mechanism of MGs changes gradually from brittle to ductile with the critical transition size being affected by strain rate, e-beam irradiation and thermal history of the sample. Besides monotonic loading, the mechanical behaviors of MGs in response to cyclic loadings and fatigue tests are also reviewed. Keywords: Metallic Glasses, Micronanoscaled, Plasticity, Strength, Cyclic LoadingIntroduction Metallic glasses (MGs), also known as amorphous metals, are materials composed of metal components but without crystalline structure.[1-3] The lack of long-range order, that is, atoms do not register in periodic lattice sites, renders MGs unique in mechanical behaviors. [4][5][6][7] Unlike crystalline metals, MGs do not have dislocation or deformation twinning as plastic carriers. When the applied mechanical load exceeds their yield strength, bulk MGs usually deform through the formation of shear band, a thin band where large shear strains localized [8], usually in a catastrophic manner. The stress level required for the nucleation and propagation of shear band is much higher than that for dislocations or twins in bulk crystalline materials, usually on the GPa level. Without early yielding, the measured elastic limit for bulk MGs can be up to 2% [4,9], much larger than their crystalline counterparts. Even though the brittleness and high cost limit the commercialization of bulk MGs, recent studies [10][11][12] demonstrated that micronanoscaled (refer to samples with their size ranged from 10 nm to 10 μm [13]) MGs own outstanding strength and reasonable plastic deformability which make them attractive for applications in Micro/Nano electro-mechanical systems (M/NEMS). Consequently, a systematic study of the mechanical properties of

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Fabrication and Properties of Micro‐ and Nanoscale Metallic Glassy Wires: A Review

2017

Adv Eng Mater

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A large number of metallic glasses (MGs) with high mechanical and functional performance that cannot be achieved by traditional metals in various alloy systems have been developed. At the same time, people realized that micro-and nanoscale wires can improve properties and extend functionality of bulk materials. Therefore, intensive effort has been made to fabricate micro-and nanoscale MG wires, and study their mechanical and physical behavior to achieve high performance. This article reviews fabrication, properties and applications of the wires, and presents technical and theoretical challenges, which must be tackled to achieve high-performance MG wire devices and understand physical mechanisms of mechanical and functional behaviors of the wires.

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Sample size matters for Al88Fe7Gd5 metallic glass: Smaller is stronger

Cited by 111 publications

References 48 publications

Micropillar compression testing of powders

Micropillar compression testing of powders

Mechanical Behavior of Micronanoscaled Metallic Glasses

Fabrication and Properties of Micro‐ and Nanoscale Metallic Glassy Wires: A Review

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