Intrinsic structural defects on medium range in metallic glasses

Huang, Xin; Zhong, Lijuan; Wang, Yun-Jiang; Dai, L.H.

doi:10.1016/j.intermet.2016.05.009

Cited by 19 publications

(11 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is seen that the surrounding environments of Pd and Si atoms are quite different from each other in the Pd 82 Si 18 system. As a result, the key question is that what the correlation between CSRO and atomic structure is, since in the common sense the latter directly determines the mechanical properties in MGs [35,36]. To further describe the local structural features, we focus on the nearest-neighbor CN and the dominating clusters characterized by the Voronoi index [37,38].…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Susceptibility of shear banding to chemical short-range order in metallic glasses

2019

View full text Add to dashboard Cite

a b s t r a c tTo clarify the critical role of chemical short-range order on the formation of shear bands in metallic glasses, atomistic simulations are performed on Pd 82 Si 18 and Cu 50 Zr 50 with different cooling history. It is found that shear bands are prone to form in samples with higher level of chemical short-range order. The magnitude of stress overshoot in shear stress-strain curve and the spatial fluctuation of short-range chemical composition are proposed to characterize shear banding susceptibility and chemical short-range order, respectively. A quantitative correlation is therefore established between shear banding and chemical short-range order. The microstructural origin of the correlation is discussed.

show abstract

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Susceptibility of shear banding to chemical short-range order in metallic glasses

2019

View full text Add to dashboard Cite

show abstract

“…It is expected that such defects are responsible for the localized plastic events of MGs. Up to this point, a number of MRO description parameters have also been proposed, for example, dominant polyhedral ratio [29] (Fn), local yield stresses gradients of the minimum energy path of the STZs along the potential energy landscape (PEL) [30], etc. which can somewhat describe the plastic flow pattern of the structure.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Medium Range Order Defects in CuxZr100-x (x = 50, 56, 60, 64) Metallic Glasses Using Reverse Monte Carlo Modeling

Liu

Luo

et al. 2022

Metals

View full text Add to dashboard Cite

The identification of glassy defects in amorphous materials is a long-standing but imperative problem which hinders our deep understanding of the structural origin of mechanical behavior in metallic glasses (MGs). Here, a combination of experiments and numerical simulations were used to reconstruct the atomic packing of MGs. Using the integration of synchrotron X-ray diffraction (XRD) datasets, ab initio molecular dynamics simulations, as well as reverse Monte Carlo simulation, we determined the three-dimensional atomic positions of a series of binary MGs CuxZr100-x (x = 50, 56, 60, 64). Then we uncovered the connection of short-range clusters as well as the nature of the medium range order (MRO). It turns out that full icosahedral tend to connect to each other forming the back bones, with dimensions positively correlated with the Cu content. By quantifying the discontinuity of full icosahedral networks, we identified the MRO defects which were found to be highly influenced by the macroscopic chemical contents. Here, the density of MRO defects is growing with the decrease of Cu contents. These results suggest the reason for the stable kinetic properties and good glass forming ability of the Cu64Zr36 system, which is rich in full icosahedral clusters <0,0,12,0> but a lack of MRO defects.

show abstract

“…Previous works have shown that shear bands are prone to be nucleated in metallic glasses under dynamic or even quasistatic loading: their fast propagation and interaction leads to macroscopic failure (Jiang and Dai, 2009). However, metallic glasses can also fail by cavitation instabilities (Huang et al, 2013(Huang et al, ,2016Murali et al, 2011). This ductile fracture behavior has been confirmed by many experimental observations.…”

Section: Introductionmentioning

confidence: 64%

Influence of surface energy and thermal effects on cavitation instabilities in metallic glasses

Huang

Zhong

Dai

2019

Mechanics of Materials

Self Cite

View full text Add to dashboard Cite

To reveal the void dominated fracture mechanism, cavitation instabilities in metallic glasses are studied through analytical and numerical approaches, with particular attention on surface energy and thermal effects. The critical pressure for unbounded growth of voids is determined, which increases apparently as surface energy is taken into account. A dimensionless number I γ which is a ratio of the energy required to form new void surface and the energy dissipated by plastic deformation is proposed. It is found that the surface energy significantly impedes void growth at the early stage of void growth when I γ is large. Besides, to address the thermal effects, another dimensionless number I th , which reflects the competition of momentum diffusion and thermal diffusion, is presented. Results of numerical simulations show that the thermal effects first promote and finally impede the void growth at the late stage of void growth when I th ≤ 1. Further study on combined influence of inertia, surface energy and thermal effects reveals the factors which are dominant as the process develops.

show abstract

Intrinsic structural defects on medium range in metallic glasses

Cited by 19 publications

References 57 publications

Susceptibility of shear banding to chemical short-range order in metallic glasses

Susceptibility of shear banding to chemical short-range order in metallic glasses

Investigation of Medium Range Order Defects in CuxZr100-x (x = 50, 56, 60, 64) Metallic Glasses Using Reverse Monte Carlo Modeling

Influence of surface energy and thermal effects on cavitation instabilities in metallic glasses

Contact Info

Product

Resources

About