Role of atomic-scale chemical heterogeneities in improving the plasticity of Cu-Zr-Ag bulk amorphous alloys

Kim, Hoon Yub; Ahn, Jae Pyoung; Lee, Byeong-Joo; Park, Kyoung Won; Lee, Jae Chul

doi:10.1016/j.actamat.2018.07.040

Cited by 35 publications

(8 citation statements)

References 69 publications

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“…In recent years, a number of methods were proposed to enhance plasticity of metallic glasses, such as addition of chemical heterogeneities [5,6] or a soft second phase [7]. A less intrusive way to tune the amorphous structure is to apply cryogenic thermal cycling that can induce rejuvenation due to heterogeneity in the local thermal expansion and therefore improve plasticity [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Potential energy states and mechanical properties of thermally cycled binary glasses

Priezjev

2019

J. Mater. Res.

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Section: Introductionmentioning

confidence: 99%

Potential energy states and mechanical properties of thermally cycled binary glasses

Priezjev

2019

J. Mater. Res.

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“…It is obvious that compared with the corresponding constituent elemental metals whose deformation is mainly dominated by the dislocation sliding 73 , the amorphization transition of Zr 16 Nb 14 Hf 22 Ta 23 Mo 25 HEA is evidently more di cult. In addition, the amorphous phase is at a higher energy state than the crystalline counterpart 69 , so in the amorphization process, the required dissipation of some extra energy should be conducive to presenting the higher hardness in the Zr 16 Nb Generally, the disordered nature in MGs provides the microscopic disparate packing density for structural inhomogeneous density uctuation 34,74 . When an external loading is applied to such materials, the local deformation occurs preferentially utilizing the movement of individual free volume 75 or collective movement of loosely packed atomic sites, referred to as STZs 76 .…”

Section: Deformation Mechanism Of Heamentioning

confidence: 99%

“…Along with the exploration of HEAs, the high negative mixing enthalpy coupled with large atomic size difference is proposed as the principle for forming high-entropy metallic glasses (HE-MGs) 32 , served as an alternative approach for superior mechanical properties 8,33 . However, HE-MGs, as same as traditional MGs, always suffer from catastrophic failure because the plastic deformation highly concentrates on the single shear band (SB) 34,35 . As a promising strategy, introducing the crystalline medium-range order (MRO) into MGs plays a signi cant role in the homogeneous plastic ow, instead of the undesirable failure in form of a dominate SB, as the length scale of MRO is comparable with the shear transformation zones (STZs) carrying plastic ows in MGs 2, 3, 5 .…”

Section: Introductionmentioning

confidence: 99%

Pt-induced atomic-level tailoring towards paracrystalline high-entropy alloy

Zhang

et al. 2022

Preprint

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The material state dominated by the crystalline medium-range order (MRO) has been achieved in the diamond system, named paracrystalline diamond, guiding a new direction to explore the missing link between amorphous and crystalline states1. Since in metallic glasses the incorporation of MRO covering a comparable length scale with the shear transformation zone can stimulate the homogeneous plastic flow2, 3, 4, 5, manipulating the population of crystalline MRO motifs reaching the paracrystalline state in alloy systems would be conducive to tune their deformation behavior on nano-scale for retarding dominant shear bands. However, it is still profoundly challenging to tune MRO motifs in a controllable manner for achieving the paracrystalline state in alloy systems. Here, based on the vast composition space and the complex atomic interactions in the multicomponent and/or high-entropy alloys (HEAs)6, 7, 8, we present an “atomic-level tailoring” strategy, analogous to cutting paper into pieces, cutting the severe-distorted crystalline Zr-Nb-Hf-Ta-Mo HEA into the high-density crystalline MRO motifs on atomic-level, to create the unprecedented paracrystalline HEA. The addition of uniformly distributed Pt atoms with the large and negative mixing enthalpy into the pristine HEA induces the local atomic reshuffling around Pt atoms for the well-targeted local amorphization qualified as the “atomic-level scissors”. Such enthalpy-guided strategy coupled with lattice-distortion effect in HEAs can provide the unique atomic-level tailoring ability for numerous opportunities abound in the purposeful regulation of structural characteristics and the significant improvement of mechanical properties.

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“…Along with the exploration of HEAs, the high negative Δ H mix coupled with large δ is proposed as the principle for forming high-entropy metallic glasses (HE-MGs) 23 , served as an alternative approach for superior mechanical properties 9 , 24 . However, HE-MGs, as same as traditional MGs, always suffer from catastrophic failure because the plastic deformation highly concentrates on the single shear band (SB) 25 , 26 . As a promising strategy, introducing the crystalline medium-range order (MRO) into MGs plays a significant role in the homogeneous plastic flow, instead of the undesirable failure in the form of a dominate SB, as the length scale of MRO is comparable with the shear transformation zones (STZs) carrying plastic flows in MGs 27 , 28 .…”

Section: Introductionmentioning

confidence: 99%

Pt-induced atomic-level tailoring towards paracrystalline high-entropy alloy

Wang

et al. 2023

Nat Commun

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Paracrystalline state achieved in the diamond system guides a direction to explore the missing link between amorphous and crystalline states. However, such a state is still challenging to reach in alloy systems in a controlled manner. Here, based on the vast composition space and the complex atomic interactions in the high-entropy alloys (HEAs), we present an “atomic-level tailoring” strategy to create the paracrystalline HEA. The addition of atomic-level Pt with the large and negative mixing enthalpy induces the local atomic reshuffling around Pt atoms for the well-targeted local amorphization, which separates severe-distorted crystalline Zr-Nb-Hf-Ta-Mo HEA into the high-density crystalline MRO motifs on atomic-level. The paracrystalline HEA exhibits high hardness (16.6 GPa) and high yield strength (8.37 GPa) and deforms by nanoscale shear-banding and nanocrystallization modes. Such an enthalpy-guided strategy in HEAs can provide the atomic-level tailoring ability to purposefully regulate structural characteristics and desirable properties.

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Role of atomic-scale chemical heterogeneities in improving the plasticity of Cu-Zr-Ag bulk amorphous alloys

Cited by 35 publications

References 69 publications

Potential energy states and mechanical properties of thermally cycled binary glasses

Potential energy states and mechanical properties of thermally cycled binary glasses

Pt-induced atomic-level tailoring towards paracrystalline high-entropy alloy

Pt-induced atomic-level tailoring towards paracrystalline high-entropy alloy

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