Phase separation in bulk-type Gd–Zr–Al–Ni metallic glass

Sohn, Seung Kook; Yook, W.; Kim, W.T.; Kim, D.H.

doi:10.1016/j.intermet.2011.12.021

Cited by 33 publications

(14 citation statements)

References 15 publications

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“…A similar DSC anomaly has also been reported in a number of other metallic glass alloys, including Zr-Be-X (X=Ti, Nb)9101112, Zr-Ti-Cu-Ni-Be1314, Gd-Zr-Al-Ni15, Ni-Zr-Nb-Al-Ta16, Cu-Zr-Al-Y17, Mg-Cu-Ag-Gd1819, Fe-M-Y-B (M=Mo, W, Nb)202122, (Fe 0.9 Co 0.1 ) 67.5 Nb 4 Gd 3.5 B 25 (ref. 23), (Fe 0.75− x Dy x B 0.2 Si 0.05 ) 96 Nb 4 (ref.…”

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confidence: 81%

Hidden amorphous phase and reentrant supercooled liquid in Pd-Ni-P metallic glasses

et al. 2017

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An anomaly in differential scanning calorimetry has been reported in a number of metallic glass materials in which a broad exothermal peak was observed between the glass and crystallization temperatures. The mystery surrounding this calorimetric anomaly is epitomized by four decades long studies of Pd-Ni-P metallic glasses, arguably the best glass-forming alloys. Here we show, using a suite of in situ experimental techniques, that Pd-Ni-P alloys have a hidden amorphous phase in the supercooled liquid region. The anomalous exothermal peak is the consequence of a polyamorphous phase transition between two supercooled liquids, involving a change in the packing of atomic clusters over medium-range length scales as large as 18 Å. With further temperature increase, the alloy reenters the supercooled liquid phase, which forms the room-temperature glass phase on quenching. The outcome of this study raises a possibility to manipulate the structure and hence the stability of metallic glasses through heat treatment.

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confidence: 81%

Hidden amorphous phase and reentrant supercooled liquid in Pd-Ni-P metallic glasses

et al. 2017

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“…The droplet-type structure will be formed as the cooling rate is relatively low; it cannot be formed finally as the cooling rate is relatively large. Sohn [21] reported the LLPS process of Gd-Zr-Al-Ni melts by spinodal decomposition when the degree of undercooling is relatively large, and by nucleation and the growth mechanism when the degree of undercooling is relatively low. In our opinion, the spinodal decomposition reaction happens in Fe 50 Cu 50 melts whether at the higher or lower cooling rate, which only determine the final micro-morphology in crystal.…”

Section: Resultsmentioning

confidence: 99%

Vitrification and Crystallization of Phase-Separated Metallic Liquid

Cheng¹,

W²,

Wang³

et al. 2017

Metals

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Abstract:The liquid-liquid phase separation (LLPS) behavior of Fe 50 Cu 50 melt from 3500 K to 300 K with different rapid quenching is investigated by molecular dynamics (MD) simulation based on the embedded atom method (EAM). The liquid undergoes metastable phase separation by spinodal decomposition in the undercooled regime and subsequently solidifies into three different Fe-rich microstructures: the interconnected-type structure is kept in the glass and crystal at a higher cooling rate, while the Fe-rich droplets are found to crystalize at a lower cooling rate. During the crystallization process, only Fe-rich clusters can act as the solid nuclei. The twinning planes can be observed in the crystal and only the homogeneous atomic stacking shows mirror symmetry along the twinning boundary. Our present work provides atomic-scale understanding of LLPS melt during the cooling process.

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“…3), the time span for the rearrangement of the atoms increases, driving the formation of certain element-rich orders [40]. Due to component preferences, the element-rich orders finally evolve to separated phases [41], and the decreasing cooling rate further coarsens the phase-separated structures [42]. Phase separation in BMGs has been studied extensively [40,[42][43][44][45], and it can be regarded as a precursor for crystallization [43].…”

Section: Resultsmentioning

confidence: 99%