Dual character of stable shear banding in bulk metallic glasses

Yang, Yong; Ye, J.C.; J, Lu; Liu, Chang

doi:10.1016/j.intermet.2011.03.003

Cited by 9 publications

(1 citation statement)

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“…[14] As shown in Figure 2(a), they found that the flow stresses at 5% plastic strain increase slightly with the decreasing sample diameter in the size range from 400 nm to 8 μm (The strength and deformation mechanism of samples smaller than 400 nm will be discussed in the next section). This strength-size relationship was proposed to result from an energy-balance model [14][15][16][17][18][19], that is, the strain energy relief during yielding is consumed by the creation of the shear band. Following this seminal work, 'size effect' on the strength of a wide range of MGs was investigated.…”

Section: Strength-size Relationshipmentioning

confidence: 99%

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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