Effect of prestraining on the deformation and fracture behavior of Zr44Ti11Cu9.8Ni10.2Be25

Lee, M.H.; Das, J.; Lee, K.S.; Kühn, U.; Eckert, J.

doi:10.1016/j.intermet.2010.02.031

Cited by 16 publications

(3 citation statements)

References 39 publications

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“…can be realized by changing the deformation/fracture behavior exactly where it is needed (e.g., at the tip of a stress concentration), rather than requiring predeformation of the whole sample or component. It is noted that there is much previous work that has used cold rolling to improve the mechanical behavior of a variety of BMGs. However, these approaches may require very high loads on bulk samples (i.e., that are subsequently machined into components) due to the very high strengths of most BMGs.…”

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confidence: 99%

Guiding and Deflecting Cracks in Bulk Metallic Glasses to Increase Damage Tolerance

Wang

Lewandowski

2014

Adv Eng Mater

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confidence: 99%

Guiding and Deflecting Cracks in Bulk Metallic Glasses to Increase Damage Tolerance

Wang

Lewandowski

2014

Adv Eng Mater

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“…In such situation, atoms will move into more stable sites due to the periodic external stress 30,31 . Hysteresis is a typical characteristic feature of viscoplastic or viscoelastic responsive behavior rather than purely elastic behavior 7,24,32 and viscoelasticity depends on the degree of structural reconfiguration 33 . Ye and co-workers have shown the existence of inelastically deformed atomic cluster zones which lead to mechanical hysteresis within the elastic region under quasi-static loading conditions 34 .…”

Section: Prestraining By Different Deformation Modes the Viscoelastimentioning

confidence: 99%

Strain perceptibility of elements on the diffusion in Zr-based amorphous alloys

Lee

Kim

Jang

et al. 2020

Sci Rep

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With the discovery of bulk metallic glasses (BMGs), there has been considerable interest in understanding their mechanical behavior. In spite of these previous observations on the relation between plastic deformation of metallic glasses and their diffusion behavior, a detailed understanding on the diffusion of BMGs is still unexplored. We evaluated the contribution of deformation-induced structural transformations (elastic, anelastic, viscoplastic or viscoelastic responsive and plastic strain) on the diffusion of Zr-based bulk metallic glasses in as-cast, elastostatically stressed and plastically deformed states. Experimental investigations of the diffusion process and the elemental distributions in the glassy alloy were performed following plastic deformation by multiple cold rolling and elastostatic cyclic compression, respectively. We compared the vacancy model and the transition state model to verify the diffusion mechanism in the deformed bulk metallic glass. The diffusion of tracer atoms, i.e., Fe, in the bulk metallic glass is affected by viscoelastic responsive strain governing the transition-state model. In contrast, the diffusion of constituent atoms, i.e., Ti, Zr, in the bulk metallic glass is dominantly affected by plastic strain governing the vacancy model. The results reveal that the diffusion behavior of bulk glassy alloys can be changed by variation of the constituent elements and applying different strain modes upon deformation.

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“…They attributed this improvement in plasticity to the excess free volume generated by the shear stresses from deformation. In addition to the research mentioned above, shot peening, severe plastic deformation, and other methods have also been adopted to explore the plastic deformation of MGs (Lee et al, 2010;Fornell et al, 2014;Gao et al, 2016;Guo et al, 2018;Ma et al, 2019;Li et al, 2020;Phan et al, 2021). The essence of all of the abovementioned methods was microstructural modulation by applying an external stress.…”

Section: Introductionmentioning

confidence: 99%

Effect of cyclic compression on the micromechanical properties of a Zr-based metallic glass

Wang,

Zhu

et al. 2024

Front. Mater.

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In this study, the effect of cyclic compression on the micromechanical properties of a Zr-based metallic glass (MG) was investigated via nanoindentation. Cyclic compression significantly softened the surface of the sample, with a maximum hardness loss of 19.93%. The number of cyclic compression passes had a greater effect on the hardness of the sample than the cyclic compression load. The elastic modulus exhibited a nonlinear variation upon increasing the cyclic loading or number of passes at a lower loading rate due to the coupling effect of loading rate and cyclic compression treatment. Then, the serration behavior and strain rate sensitivity analysis were applied. The calculated m-values obtained for MGs were all negative and gradually tended to zero upon further cyclic compression treatment. This demonstrated the weakening effect of cyclic compression on the strain rate sensitivity of MG, and the underlying mechanism was discussed. This study provides a process reference for studying the fatigue failure behaviors of MGs from the perspective of mechanical properties, which is useful for understanding their fatigue generation.

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Effect of prestraining on the deformation and fracture behavior of Zr44Ti11Cu9.8Ni10.2Be25

Cited by 16 publications

References 39 publications

Guiding and Deflecting Cracks in Bulk Metallic Glasses to Increase Damage Tolerance

Guiding and Deflecting Cracks in Bulk Metallic Glasses to Increase Damage Tolerance

Strain perceptibility of elements on the diffusion in Zr-based amorphous alloys

Effect of cyclic compression on the micromechanical properties of a Zr-based metallic glass

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