Thin-film metallic glasses for substrate fatigue-property improvements

Jia, Haoling; Liu, Fengxiao; An, Zhinan; Li, Weidong; Wang, Gongyao; Chu, Jinn P.; Jang, J.S.C.; Gao, Yanfei; Liaw, Peter K.

doi:10.1016/j.tsf.2013.12.024

Cited by 85 publications

(47 citation statements)

References 96 publications

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“…Thin films, both amorphous and crystalline films, have been extensively reported to be capable of enhancing the performance of many types of materials through coating, especially the mechanical performance of substrate materials. [41,[45][46][47] Furthermore, scaling down a material structure down to the nanoscale can cause them to exhibit different behaviors, as compared to their bulk counterparts, in which they become stronger as their size is reduced according to the Hall-Petch relationship. [23,48,49] Therefore, it is hypothesized that a thin HEA film at nanoscale may greatly enhance the mechanical performance of the composite micro/nano structure.…”

Section: Hea Filmmentioning

confidence: 99%

High‐Entropy Alloy (HEA)‐Coated Nanolattice Structures and Their Mechanical Properties

et al. 2017

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Nanolattice structure fabricated by two-photon lithography (TPL) is a coupling of size-dependent mechanical properties at micro/nano-scale with structural geometry responses in wide applications of scalable micro/nano-manufacturing. In this work, three-dimensional (3D) polymeric nanolattices are initially fabricated using TPL, then conformably coated with an 80 nm thick high-entropy alloy (HEA) thin film (CoCrFeNiAl 0.3 ) via physical vapor deposition (PVD). 3D atomic-probe tomography (APT) reveals the homogeneous element distribution in the synthesized HEA film deposited on the substrate. Mechanical properties of the obtained composite architectures are investigated via in situ scanning electron microscope (SEM) compression test, as well as finite element method (FEM) at the relevant length scales. The presented HEA-coated nanolattice encouragingly not only exhibits superior compressive specific strength of %0.032 MPa kg À1 m 3 with density well below 1000 kg m À3 , but also shows good compression ductility due to its composite nature. This concept of combining HEA with polymer lattice structures demonstrates the potential of fabricating novel architected metamaterials with tunable mechanical properties.

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Section: Hea Filmmentioning

confidence: 99%

High‐Entropy Alloy (HEA)‐Coated Nanolattice Structures and Their Mechanical Properties

et al. 2017

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“…This would be costly, impeding its practicability for real-life applications [2,9,14,15]. Alternatively, it is widely known that thin films can be used as a protective and mechanically enhancing surface coating on the substrate [16][17][18][19][20]. Therefore, incorporating HEA as a thin film material would tremendously extend the scope of its practical application.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical and Corrosion Behaviors of CoCrFeNiAl0.3 High Entropy Alloy (HEA) Films

et al. 2017

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Abstract:The HEA-CoCrFeNiAl 0.3 thin film in this study has been successfully developed by radio frequency (RF) magnetron sputtering to meet the increasing demand in engineering applications. Its microstructure and surface profile were investigated accordingly. The as-synthesized HEA film was found to have a homogeneous element distribution and ultra-smooth surface, exhibiting a typical face-centered cubic (FCC) solid solution. The film showed better mechanical properties than its bulk counterpart, with a Young's modulus and hardness of~201.4 GPa and~11.5 GPa, respectively. Furthermore, corrosion tests demonstrated decreased sensitivity to localized corrosion in comparison to the commercial 304 stainless steel in NaCl solution.

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“…For structural materials, more than 90% of mechanical failures are induced by fatigue loading and, therefore, gaining a solid understanding of the fatigue mechanism in BMGs is a necessary prerequisite for their safe applications. Recently, Jia et al [1] summarized and discussed the fatigue behavior of structural-material substrates coated with thin-film MGs, and their conclusions are equally applicable to BMG samples. Many experiments have been completed to study the fatigue damage mechanism and life time for BMGs.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Cyclic Deformation in Bulk Metallic Glasses

Jiang

2016

Metals

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Abstract:In this paper, a systematic numerical simulation was performed to elucidate the damage mechanisms in bulk metallic glasses (BMGs) subjected to the tension-compression cyclic loading, and then the relation between fatigue life, applied strain, and cycling frequency was therefore presented. The free volume was selected as an internal state variable to depict the shear-band nucleation, growth, and coalescence with the help of free volume theory, which was incorporated into the ABAQUS code via a user material subroutine UMAT. Under cyclic loading, the shear banding initiation mainly stems from the microstructure inhomogeneity in BMGs and, further, the effect of applied strain amplitude and cycling frequency was discussed. The present simulations will shed some light on the fatigue damage mechanisms and fatigue life evaluation of BMG structures.

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Thin-film metallic glasses for substrate fatigue-property improvements

Cited by 85 publications

References 96 publications

High‐Entropy Alloy (HEA)‐Coated Nanolattice Structures and Their Mechanical Properties

High‐Entropy Alloy (HEA)‐Coated Nanolattice Structures and Their Mechanical Properties

Microstructure, Mechanical and Corrosion Behaviors of CoCrFeNiAl0.3 High Entropy Alloy (HEA) Films

Numerical Modeling of Cyclic Deformation in Bulk Metallic Glasses

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