Spatial correlation of irreversible displacement in oscillatory-sheared metallic glasses

doi:10.1088/1674-1056/ac65f3

中国物理B ›› 2022, Vol. 31 ›› Issue (8): 86108-086108.doi: 10.1088/1674-1056/ac65f3

Spatial correlation of irreversible displacement in oscillatory-sheared metallic glasses

Shiheng Cui(崔世恒), Huashan Liu(刘华山), and Hailong Peng(彭海龙)^†

School of Materials Science and Engineering, Central South University, Changsha 410083, China

收稿日期:2022-03-09 修回日期:2022-04-07 接受日期:2022-04-11 出版日期:2022-07-18 发布日期:2022-07-29
通讯作者: Hailong Peng E-mail:hailong.peng@csu.edu.cn
基金资助:
Project supported by the Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ30833).

Spatial correlation of irreversible displacement in oscillatory-sheared metallic glasses

Shiheng Cui(崔世恒), Huashan Liu(刘华山), and Hailong Peng(彭海龙)^†

School of Materials Science and Engineering, Central South University, Changsha 410083, China

Received:2022-03-09 Revised:2022-04-07 Accepted:2022-04-11 Online:2022-07-18 Published:2022-07-29
Contact: Hailong Peng E-mail:hailong.peng@csu.edu.cn
Supported by:
Project supported by the Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ30833).

摘要/Abstract

摘要： We report computer simulations on the oscillatory of CuZr metallic glasses at zero temperature with different shear amplitudes. In small system a homogenous shear deformation is found, while in large system an inhomogeneous shear deformation is found with a shear band formed. Concomitantly, spatial correlation of irreversible displacement exhibits an isotropic and exponential decay in the case of homogeneous deformation, whereas a mixed power-law and exponential decay in the case of anisotropic and inhomogeneous deformation. By projecting the azimuthal-dependent correlation function onto the spherical harmonics, we found a strong polar symmetry that accounts for the emerged shear band, and a weaker quadrupolar symmetry that accounts for the elastic filed generated by Eshelby inclusions. By this, we conclude that the anisotropy and decaying formula of the plastic correlation are dominated by the homogeneity or inhomogeneity for the deformation in the metallic glasses.

关键词: metallic glasses, mechanical property, molecular dynamics

Abstract: We report computer simulations on the oscillatory of CuZr metallic glasses at zero temperature with different shear amplitudes. In small system a homogenous shear deformation is found, while in large system an inhomogeneous shear deformation is found with a shear band formed. Concomitantly, spatial correlation of irreversible displacement exhibits an isotropic and exponential decay in the case of homogeneous deformation, whereas a mixed power-law and exponential decay in the case of anisotropic and inhomogeneous deformation. By projecting the azimuthal-dependent correlation function onto the spherical harmonics, we found a strong polar symmetry that accounts for the emerged shear band, and a weaker quadrupolar symmetry that accounts for the elastic filed generated by Eshelby inclusions. By this, we conclude that the anisotropy and decaying formula of the plastic correlation are dominated by the homogeneity or inhomogeneity for the deformation in the metallic glasses.

Key words: metallic glasses, mechanical property, molecular dynamics

中图分类号: (Amorphous semiconductors, metals, and alloys)

61.43.Dq

64.70.pe (Metallic glasses) 62.20.fg (Shape-memory effect; yield stress; superelasticity) 62.20.fq (Plasticity and superplasticity)

Shiheng Cui(崔世恒), Huashan Liu(刘华山), and Hailong Peng(彭海龙). Spatial correlation of irreversible displacement in oscillatory-sheared metallic glasses[J]. 中国物理B, 2022, 31(8): 86108-086108.

Shiheng Cui(崔世恒), Huashan Liu(刘华山), and Hailong Peng(彭海龙). Spatial correlation of irreversible displacement in oscillatory-sheared metallic glasses[J]. Chin. Phys. B, 2022, 31(8): 86108-086108.

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Spatial correlation of irreversible displacement in oscillatory-sheared metallic glasses

Spatial correlation of irreversible displacement in oscillatory-sheared metallic glasses

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