Thermodynamic evidence for cluster ordering in Cu46Zr42Al7Y5 ribbons during glass transition

Zheng, Huizhen; Lv, Yu-Miao; Sun, Qilong; Hu, Lei; Yang, Xiaokun; Yue, Yuanzheng

doi:10.1007/s11434-016-1057-3

Cited by 8 publications

(2 citation statements)

References 50 publications

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“…Figure 5 shows that the cluster rearrangement occurs most prominently at medium-range length scales, at the fifth shell ( r =11 Å) or longer. Zheng et al 39. observed three exothermal responses (peaks) in glassy ribbons of Cu 46 Zr 42 Al 7 Y 5 .…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

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

et al. 2017

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“…The relatively bigger ∆T x of the (Cu 43 Zr 47 Al 7 Ag 3 ) 99.5 Co 0.5 powders at various heating rates in Table 3 indicates good thermal stability of the amorphous alloy. Moreover, the apparent activation energy (Figure 6b) of the powder is calculated based on the Kissinger's method [40]:…”

Section: Phase Formation and Thermal Propertiesmentioning

confidence: 99%

Microstructure and Wear Properties of HVAF Sprayed Cu-Zr-Al-Ag-Co Amorphous Coatings at Different Spray Temperatures

et al. 2022

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Wear-resistant Cu-Zr-Al-Ag-Co amorphous coatings were fabricated by high-velocity air-fuel spray technology using (Cu43Zr47Al7Ag3)99.5Co0.5 powder at different temperatures (i.e., 645, 725, and 805 K). The feedstock powders (98.6 wt.% amorphous phase) were produced by a gas atomization method. Thermal properties and microstructure of the powders and the coatings were comparably investigated by differential scanning calorimeter, scanning electron microscope, and transmission electron microscopy techniques. Wear properties were studied by a dry sliding wear tester under the linear reciprocating sliding in a ball-on-plate mode using a GCr15 ball as the counterpart at room temperature in air. A large fraction of amorphous phase (~67.5 wt.%) and crystalline phases (ZrO2, Al2.5Cu0.5Zr, and AlZr3) are found in the coating fabricated at a temperature (725 K) between the glass transition temperature (Tg) and the onset crystallization temperature (Tx). In addition, the coating also exhibits the highest Vickers hardness (554 HV0.1), bonding strength (59.3 MPa), a relatively low porosity (1.65%), and superior wear resistance. The wear mechanism of the coating is primarily abrasive wear and slight adhesive wear.

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Mechanism of synergistic alloying effects on glass-forming ability of magnetic metallic glasses

et al. 2020

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Thermodynamic evidence for cluster ordering in Cu46Zr42Al7Y5 ribbons during glass transition

Cited by 8 publications

References 50 publications

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

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

Microstructure and Wear Properties of HVAF Sprayed Cu-Zr-Al-Ag-Co Amorphous Coatings at Different Spray Temperatures

Mechanism of synergistic alloying effects on glass-forming ability of magnetic metallic glasses

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