Deformation Behavior of Bulk Metallic Glasses and High Entropy Alloys under Complex Stress Fields: A Review

Chen, Shun Hua; Wang, Jingyuan; Xia, L.; Wu, Yucheng

doi:10.3390/e21010054

Cited by 18 publications

(8 citation statements)

References 131 publications

(219 reference statements)

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“…The formation of microcracks in the ID regions of the W20 RHEA could be further validated. The formation of microcracks may be attributed to the formation of complex local stress fields within RHEAs, resulting from both the uneven distribution of elements and the lattice distortion effect [ 31 , 54 ]. As can be seen from Figure 9 d, the molten droplet appeared in the ID region, as circled by the orange dotted line, which is usually observed on the fracture surface of bulk metallic glasses (BMGs) [ 55 ].…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation Wx(TaVZr)100−x (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys

Zhang

Chen

Liu

et al. 2022

Entropy

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In this work, novel high-strength, low-activation Wx(TaVZr)100−x (x = 5, 10, 15, 20, 25) refractory high entropy alloys (RHEAs) were prepared by vacuum arc melting. Their microstructure, compressive mechanical properties, hardness, and fracture morphology were investigated and analyzed. The results show that the RHEAs possess a disordered BCC phase, ordered Laves phase, and Zr-rich HCP phase. Their dendrite structures were observed, and the distribution of dendrites became gradually more dense with an increase in W content. The RHEAs demonstrate high strength and hardness, with these properties being higher than in most reported tungsten-containing RHEAs. For example, the typical W20(TaVZr)80 RHEA has a yield strength of 1985 MPa and a hardness of 636 HV, respectively. The improvement in terms of strength and hardness are mainly due to solid solution strengthening and the increase in dendritic regions. During compression, with the increase in the applied load, the fracture behavior of RHEAs changed from initial intergranular fractures to a mixed mode combining both intergranular and transgranular fractures.

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Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation Wx(TaVZr)100−x (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys

Zhang

Chen

Liu

et al. 2022

Entropy

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“…The atomic-level understanding of the structure-property relationship of amorphous materials is important for numerous structural and biomedical applications [1][2][3]. By now it is well established that an elementary plastic event in disordered solids involves a collective rearrangement of a small group of neighboring particles, or the so-called shear transformation [4,5].…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Analysis of Nonaffine Displacements in Disordered Solids Sheared Across the Yielding Point

Priezjev

2020

Metall Mater Trans A

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The time evolution and spatial correlations of nonaffine displacements in deformed amorphous solids are investigated using molecular dynamics simulations. The three-dimensional model glass is represented via the binary mixture, which is slowly annealed well below the glass transition temperature and then sheared at a constant strain rate. It is shown that with increasing strain, the typical size of clusters of atoms with large nonaffine displacements increases, and these clusters remain spatially homogeneously distributed, until the yielding point when mobile atoms become localized within a system-spanning shear band. Furthermore, the yielding transition is associated with an abrupt change in the spatial correlation of nonaffine displacements, which varies from exponential to power-law decay. We also find that the height of the first peak in the pair correlation function of small atoms exhibits a distinct increase at the yielding strain. These results are discussed in relation to the yielding transition in amorphous materials under cyclic loading.

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“…Due to the intrinsic high toughness of the parent Zr 57 Cu 20 Al 10 Ni 8 Ti 5 MG, with a plastic zone radius of about 0.6 mm, the crack propagation was stopped by a blunting effect (Figure 5c), where the global large plasticity of the cellular MGs can be achieved [13]. At the nodes of the cellular MGs, the evolution of the shear and densities of four specimens are given in Figure 5d [71]. After densification, the smallest shear band density at the nodes of the cellular MGs was larger than 0.13 µm −1 , and the largest average value even reached 0.16 µm −1 , corresponding to an average shear band spacing of 6.15 µm.…”

Section: Cellular Mgs With Macroscopic Cellular Structuresmentioning

confidence: 99%

Metallic Glass Structures for Mechanical-Energy-Dissipation Purpose: A Review

Chen

Cheng

Chan

et al. 2018

Metals

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Metallic glasses (MGs), a new class of advanced structural materials with extraordinary mechanical properties, such as high strength approaching the theoretical value and an elastic limit several times larger than the conventional metals, are being used to develop cellular structures with excellent mechanical-energy-dissipation performance. In this paper, the research progress on the development of MG structures for energy-dissipation applications is reviewed, including MG foams, MG honeycombs, cellular MGs with macroscopic cellular structures, microscopic MG lattice structures and kirigami MG structures. MG structures not only have high plastic energy absorption capacity superior to conventional cellular metals, but also demonstrate great potential for storing the elastic energy during cyclic loading. The deformation behavior as well as the mechanisms for the excellent energy-dissipation performance of varying kinds MG structures is compared and discussed. Suggestions on the future development/optimization of MG structures for enhanced energy-dissipation performance are proposed, which can be helpful for exploring the widespread structural-application of MGs.

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Deformation Behavior of Bulk Metallic Glasses and High Entropy Alloys under Complex Stress Fields: A Review

Cited by 18 publications

References 131 publications

Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation Wx(TaVZr)100−x (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys

Microstructure and Mechanical Properties of Novel High-Strength, Low-Activation Wx(TaVZr)100−x (x = 5, 10, 15, 20, 25) Refractory High Entropy Alloys

Spatiotemporal Analysis of Nonaffine Displacements in Disordered Solids Sheared Across the Yielding Point

Metallic Glass Structures for Mechanical-Energy-Dissipation Purpose: A Review

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