Tunable elastic heterogeneity caused by deformation-induced magnetization in flexible metallic glass

Huang, Bo; He, Quanfeng; Wang, A.D.; Zhao, Chengliang; Wang, Q.; Yang, Yong; Liu, C.T.

doi:10.1016/j.scriptamat.2016.11.001

Cited by 7 publications

(2 citation statements)

References 27 publications

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“…Above the critical size, the increase in correlation length decreases the number of soft clusters, limiting strain percolation paths to form shear bands, intensifying the extent of strain localization and reducing the ductility of MGs. Since the population of soft spots and their spatial distribution can be tuned by such processes as rapid quenching, 14 high-pressure torsion, [55][56][57] laser processing, 58 and mechanical cycling, 59 and magnetization, 60 we envision that our results may offer a totally new approach of using the control of short-range to medium-range order in monolithic MGs to radically improve the ductility, and hence the fracture toughness, of these alloys. As such, this may provide new possibilities for the industrial application of these high-strength metallic alloys as structural materials with unique combinations of mechanical properties.…”

Section: A Transition In Shear-band Formation Mechanismsmentioning

confidence: 98%

Spatial correlation of elastic heterogeneity tunes the deformation behavior of metallic glasses

et al. 2018

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Metallic glasses (MGs) possess remarkably high strength but often display only minimal tensile ductility due to the formation of catastrophic shear bands. Purposely enhancing the inherent heterogeneity to promote distributed flow offers new possibilities in improving the ductility of monolithic MGs. Here, we report the effect of the spatial heterogeneity of elasticity, resulting from the inherently inhomogeneous amorphous structures, on the deformation behavior of MGs, specifically focusing on the ductility using multiscale modeling methods. A highly heterogeneous, Gaussian-type shear modulus distribution at the nanoscale is revealed by atomistic simulations in Cu 64 Zr 36 MGs, in which the soft population of the distribution exhibits a marked propensity to undergo the inelastic shear transformation. By employing a mesoscale shear transformation zone dynamics model, we find that the organization of such nanometer-scale shear transformation events into shear-band patterns is dependent on the spatial heterogeneity of the local shear moduli. A critical spatial correlation length of elastic heterogeneity is identified for the simulated MGs to achieve the best tensile ductility, which is associated with a transition of shear-band formation mechanisms, from stress-dictated nucleation and growth to structure-dictated strain percolation, as well as a saturation of elastically soft sites participating in the plastic flow. This discovery is important for the fundamental understanding of the role of spatial heterogeneity in influencing the deformation behavior of MGs. We believe that this can facilitate the design and development of new ductile monolithic MGs by a process of tuning the inherent heterogeneity to achieve enhanced ductility in these high-strength metallic alloys.

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Section: A Transition In Shear-band Formation Mechanismsmentioning

confidence: 98%

Spatial correlation of elastic heterogeneity tunes the deformation behavior of metallic glasses

et al. 2018

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“…中国科学: 物理学力学天文学, 2020, 50: 067004 效应 [9][10][11][12] . 我们先前的研究表明, 在铁基非晶合金中会出现由应力磁化导致的亚微米尺度的弹性不均匀性 [13] . 然而 [17] , 在弹性极限内准静态的纳米压痕深度…”

Section: 引言unclassified

Magnetization-affected localized flows in ferromagnetic metallic glass

Huang¹,

Wang²

2020

Sci. Sin.-Phys. Mech. Astron.

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Fe-based bulk amorphous alloys with high glass formation ability and high saturation magnetization Science Bulletin 60, 396 (2015); Effect of Co on the martensitic transformation, crystal structure and magnetization of Ni 52.5 Mn 23.5 Ga 24 based ferromagnetic shape memory alloys Chinese Science Bulletin 56, 796 (2011); Structural relaxation of metallic glass forming melts SCIENCE CHINA Physics, Mechanics & Astronomy 53, 405 (2010); Bio-inspired multifunctional metallic glass SCIENCE CHINA Chemistry 59, 271 (2016); Correlation of cooperatively localized rearrangement on the "fluidized domain" in glass substances (or polymers) to their fragility III: Theory of dynamic fragility at isochoric state

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Magnetic and thermal stabilities of FeSiB eutectic amorphous alloys: Compositional effects

Yue

Zhang

Cheng

et al. 2019

Journal of Alloys and Compounds

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Tunable elastic heterogeneity caused by deformation-induced magnetization in flexible metallic glass

Cited by 7 publications

References 27 publications

Spatial correlation of elastic heterogeneity tunes the deformation behavior of metallic glasses

Spatial correlation of elastic heterogeneity tunes the deformation behavior of metallic glasses

Magnetization-affected localized flows in ferromagnetic metallic glass

Magnetic and thermal stabilities of FeSiB eutectic amorphous alloys: Compositional effects

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