Reversible polyamorphic transitions in Ce65.5Al10Cu22.5Co2 metallic glass

Wang, Yongyong; Dong, Xiao; Song, Xiaohui; Wang, Jinfeng.; Gong, Li; Liu, Riping

doi:10.1016/j.matlet.2015.10.027

Cited by 6 publications

(6 citation statements)

References 30 publications

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“…The previous research of polyamorphism in MGs reported that the variations of the relative volume indicated that a polyamorphic transition occurred [20][21][22], so we inferred that a polyamorphic transition occurred in Er 55 Al 25 Comparing the relative volume changes during compression and decompression, the results show that the polyamorphic transition in MGs is a reversible process, and reversible transition displays a strong hysteresis. These results are consistent with the previous reports in Ce-MGs [14]. The decompression data points did not re-trace the compression path, which indicated that the deformation of MGs under pressures is not entirely elastic.…”

Section: Methodssupporting

confidence: 92%

“…The x-ray absorption spectroscopy and ab initio molecular dynamics (AIMD) simulations revealed that the polyamorphism in rare Earth element-based MGs (REMGs) was due to the delocalization of 4f electrons induced by pressure [6,13]. Our previous studies indicated that the polyamorphism in REMGs is a reversible phase transition, and strongly related to the rare Earth element concentration [14,15]. Recently, polyamorphic transition has also been reported in Pd 41.5 Ni 41.5 P 17 MGs [16].…”

Section: Introductionmentioning

confidence: 99%

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Structural evolution of heavy rare Earth-based metal glass under high pressure

Wang¹,

Zhang²,

Li³

et al. 2020

J. Phys.: Condens. Matter

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The structural evolution of Er55Al25Co20 metallic glasses (MGs) at high pressure was studied through x-ray diffraction with synchrotron radiation. The compression ratio, differential structure factor, pair distribution function g(r), and relative resistance as functions of pressure were analyzed and discussed. A reversible polyamorphic transition with a clear hysteresis was detected in the Er55Al25Co20 MGs. The irreversible annihilation of free volume and voids led to a densification of the specimens. Electronic resistance measurements demonstrated that the transition was strongly correlated with the electronic structural evolution. The results provide a new insight into understanding the mechanisms of polyamorphism in MGs.

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Section: Methodssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Structural evolution of heavy rare Earth-based metal glass under high pressure

Wang¹,

Zhang²,

Li³

et al. 2020

J. Phys.: Condens. Matter

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“…During the cooling of the liquid alloy, there is a continuous change in volume and energy (enthalpy), with the derivative changing in the vicinity of T g (the slope of enthalpy is proportional to the specific heat). The glass transition temperature for a cooling rate of 10 11 K s −1 is 725 K [10]. For the obtained glass, the total and partial pair distribution functions (PDFs) g(r) were determined by the equation…”

Section: Local Atomic Structurementioning

confidence: 99%

“…in amorphous ice [8] or amorphous silicon [9], leading to a change in the state of the glass between low-density amorphous and high-density amorphous. Polyamorphic transition has also been observed in MGs, including rare-earth metals like Ce, Yb, etc [10][11][12] due to the delocalisation of 4f electrons [11]. In the case of Ce-Al alloys, depending on the ratio of atom sizes and concentrations of Ce and Al, the result of the polymorphic transition is either a stabilisation of the amorphous phase as in the example of Ce 55 Al 45 alloy or a partial devitrification as in Ce 75 Al 25 alloy [13].…”

Section: Introductionmentioning

confidence: 99%

Atomic and electronic structures of Ni₆₄Zr₃₆ metallic glass under high pressure

Kostera,

Antonowicz,

Dzięgielewski

2024

New J. Phys.

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Amorphous metallic alloys, also known as metallic glasses (MGs), are materials with unique physical properties resulting from their disordered yet densely packed atomic structure. The packing density of MGs can be further enhanced by external pressure, forcing the decrease of interatomic distances and modifying both the atomic and electronic structure of an alloy. This work reports on classical molecular dynamics (MD) and density functional theory (DFT) studies of Ni64Zr36 MG in a hydrostatic pressure range of 0-120 GPa. The MD simulations revealed that compression leads to enhanced short-range ordering by increasing the contribution of efficiently packed icosahedral-like clusters. According to the DFT calculations, for pressure above 50 GPa, Zr atoms show a significant change in electronic configuration, with a dominant charge transfer from their s and p to d-states and charge redistribution between Ni and Zr atoms. This variation is correlated with the appearance of pairs with significantly shortened interatomic distances, as detected by the MD. We conclude that the enhanced icosahedral ordering in Ni64Zr36 MG is induced not only by the pressure-driven densification of an alloy but also by a variation of its electronic structure.

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“…The trivalent lanthanides (La through Lu except Eu and Yb) have been shown to follow a crystal structure sequence with decreasing the atomic number or increasing pressure: hcp → samarium type (Sm-type) → double hexagonal close packed (dhcp) → fcc → distorted fcc (dfcc) [9]. Except for pure rare-earth elements, lanthanide-solvent bulk metallic glasses undergo the low-density state to high-density state trasitions under high pressures [10][11][12][13][14]. This feature invites the questions: if the phase transition of the rare-earth-HEAs obey the route of rear-earth metatls under high pressures?…”

Section: Introductionmentioning

confidence: 99%