Structure origin of a transition of classic-to-avalanche nucleation in Zr-Cu-Al bulk metallic glasses

Lan, Si; Wu, Zhong Chao; Wei, Xiaoya; Zhou, Jie; Liu, Xiongjun; Neuefeind, J.; Wang, Xun-Li

doi:10.1016/j.actamat.2018.02.028

Cited by 59 publications

(15 citation statements)

References 73 publications

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“…Compared with the XRD analysis of annealed alloys, it could be inferred that the crystallization mechanism of Zr54 BMG is changed by Ho addition. It has been found in the nucleation mechanism of Zr-Cu-Al BMGs, which could be divided into two categories: CuZr 2 -type and Cu 10 Zr 7 -type [ 46 ]. CuZr 2 -type represents the lower free energy barrier and easy nucleation, attributing to the simple space unit of CuZr 2 .…”

Section: Resultsmentioning

confidence: 99%

Effect of Ho Addition on the Glass-Forming Ability and Crystallization Behaviors of Zr54Cu29Al10Ni7 Bulk Metallic Glass

Liang

et al. 2022

Materials

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The effect of holmium (Ho) addition on the glass-forming ability (GFA) and crystallization behaviors of Zr54Cu29Al10Ni7 bulk metallic glass (BMGs) were studied by employing differential scanning calorimetry (DSC), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The characteristic temperatures and activation energies of crystallization were obtained from DSC data. Classical kinetic modes were used to evaluate the crystallization processes of Zr54Cu29Al10Ni7 and Zr48Cu29Ni7Al10Ho6 BMGs. The results showed that Ho addition reduces the activation energy in the original crystallization period of Zr-based BMG and improves the nucleation, which is due to the formation of simpler compounds, such as CuZr2, Cu2Ho, and Al3Zr5.

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Section: Resultsmentioning

confidence: 99%

Effect of Ho Addition on the Glass-Forming Ability and Crystallization Behaviors of Zr54Cu29Al10Ni7 Bulk Metallic Glass

Liang

et al. 2022

Materials

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“…The fluxing agent B 2 O 3 plays an essential role in reducing the contents of impurities and surface metallic oxides in the sample, increasing the undercooling degree [21] . On the other hand, various degrees of chemical short-range order can coexist in the molten alloys, due to the complex composition of HEAs [43] , which hinders crystallization during undercooling [44,45] . These two mechanisms could explain the large undercooling of the N-HEAs.…”

Section: Origin Of Large Degree Of Undercoolingmentioning

confidence: 99%

Formation of strong and ductile FeNiCoCrB network-structured high-entropy alloys by fluxing

2023

Microstructures

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A series of [(FeNiCo) 0.85 Cr 0.15 ] 100-x B x (x = 12, 15, 17) high-entropy alloys with network-like microstructures (N-HEAs) and a wavelength of 3-5 μm was prepared using the fluxing method. The novel N-HEAs exhibited higher strength and ductility compared with samples obtained by suction casting. Neutron diffraction and scanning electron microscopy measurements showed that the network-like structure contained soft face-centered cubic (FCC) and hard tetragonal Cr 2 B-type sub-networks. The network-like structure was formed during the solidification of the molten alloy from a deeply undercooled state, achieved by removing impurities and most metallic oxides through B 2 O 3 fluxing. The mechanical properties could be tuned by modifying the composition to change the volume fractions of the different sub-networks. When x decreased from 17 to 12, the compressive yield strength decreased from 1.6 to 1.1 GPa, while the compressive strain increased from ~20% to ~70%. The N-HEA samples with x = 12 and 15 also exhibited a good tensile ductility of 19% and 14%, respectively. In situ synchrotron X-ray diffraction results revealed an inhomogeneous deformation behavior, i.e., the soft FCC phase yielded prior to the hard Cr 2 B-type phase, which bore more stress in the initial stage of the plastic deformation. In the later stage of the plastic deformation, the ductility of the sample was provided by the FCC phase, together with some contributions from the Cr 2 B-type phase.

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“…For MGs, due to the lack of work-hardening effect, the fracture strength in uniaxial compression tests generally will be equal to or close to the yielding strength [13]. The intensity and direction of stress at the moment of yielding or fracture reflect the critical stress condition to trigger the shear band avalanche [14,15]. From the microcosmic aspect, the yielding criterion reflects the critical stress condition to trigger the localization of shear transformation of atomic groups [16,17].…”

Section: Fracture Behaviors Of Mgsmentioning

confidence: 99%

Understanding the Fracture Behaviors of Metallic Glasses—An Overview

2019

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Fracture properties are crucial for the applications of structural materials. The fracture behaviors of crystalline alloys have been systematically investigated and well understood. The fracture behaviors of metallic glasses (MGs) are quite different from that of conventional crystalline alloys and have drawn wide interests. Although a few reviews on the fracture and mechanical properties of metallic glasses have been published, an overview on how and why metallic glasses fall out of the scope of the conventional fracture mechanics is still needed. This article attempts to clarify the up-to-date understanding of the question. We review the fracture behaviors of metallic glasses with the related scientific issues including the mode I fracture, brittle fracture, super ductile fracture, impact toughness, and fatigue fracture behaviors. The complex fracture mechanism of MGs is further discussed from the perspectives of discontinuous stress/strain field, plastic zone, and fracture resistance, which deviate from the classic fracture mechanics in polycrystalline alloys. Due to the special deformation mechanism, metallic glasses show a high variability in fracture toughness and other mechanical properties. The outlook presented by this review could help the further studies of metallic glasses. The review also identifies some key questions to be answered.

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Structure origin of a transition of classic-to-avalanche nucleation in Zr-Cu-Al bulk metallic glasses

Cited by 59 publications

References 73 publications

Effect of Ho Addition on the Glass-Forming Ability and Crystallization Behaviors of Zr54Cu29Al10Ni7 Bulk Metallic Glass

Effect of Ho Addition on the Glass-Forming Ability and Crystallization Behaviors of Zr54Cu29Al10Ni7 Bulk Metallic Glass

Formation of strong and ductile FeNiCoCrB network-structured high-entropy alloys by fluxing

Understanding the Fracture Behaviors of Metallic Glasses—An Overview

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