Microstructure and Mechanical Properties of CoWB Based Composites Produced by Crystallization of Ni-Co-Zr-Ta-W-B Bulk Metallic Glass

Hitit, Aytekin; Yazici, Ziya Ozgur; Şahin, Hakan; Öztürk, Pelin; Eryeşil, Buğrahan; Barut, Nusrettin

doi:10.3390/met12020251

Cited by 1 publication

(1 citation statement)

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“…Since their discovery in the 1960s [1], metallic glasses with disordered structures inherited from molten liquid via a fast quenching process have attracted significant research interest due to their outstanding elastic limit, yielding strength and fracture toughness when compared with their crystalline counterparts [2][3][4][5][6]. To understand in depth the hidden mechanism of the glass forming process and the macroscopic mechanical behavior of MGs, it is an urgent need to investigate the microscopic structures tracing back to the possible atomic level [7][8][9][10].…”

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

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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.

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