The role of liquid–liquid transition in glass formation of CuZr alloys

2017 ◽  
Vol 19 (24) ◽  
pp. 15962-15972 ◽  
Author(s):  
Xi Zhao ◽  
Chunzhen Wang ◽  
Haijiao Zheng ◽  
Zean Tian ◽  
Lina Hu
Keyword(s):  
Glass Formation ◽  
Glass Forming Ability ◽  
Structure Evolution ◽  
Glass Forming ◽  
Liquid Transition

The structure evolution during LLTs is beneficial to the glass forming ability (GFA) of Cu–Zr systems.

Glass Formation and Glass Forming Ability of Alloys Near Eutectic Composition

2000 ◽  
Vol 644 ◽  
Author(s):  
Y. Li
Keyword(s):  
Glass Transition ◽  
Glass Formation ◽  
Eutectic Composition ◽  
Glass Forming Ability ◽  
Critical Section ◽  
Bulk Glass ◽  
Melting Behaviour ◽  
Eutectic Alloys ◽  
Section Thickness ◽  
Glass Forming

AbstractOnset temperature, Tm and offset temperature (liquidus) Tl of melting of a series of bulk glass forming alloys based on La, Mg, and Pd have been measured by studying systematically the melting behaviour of these alloys using DTA or DSC. Bulk metallic glass formation has been found to be most effective at or near their eutectic points and less effective for off-eutectic alloys. Reduced glass transition temperature Trg given by Tg/Tl is found to show a stronger correlation with critical cooling rate or critical section thickness for glass formation than Trg given by Tg/Tm.

scholarly journals Composition dependence of the glass forming ability in binary mixtures: The role of demixing entropy

2016 ◽  
Vol 145 (3) ◽  
pp. 034503 ◽  
Author(s):  
Ujjwal Kumar Nandi ◽  
Atreyee Banerjee ◽  
Suman Chakrabarty ◽  
Sarika Maitra Bhattacharyya
Keyword(s):  
Binary Mixtures ◽  
Composition Dependence ◽  
Glass Forming Ability ◽  
Glass Forming

Bulk glass formation in the Ni–Zr–Ti–Nb–Si–Sn alloy system

2004 ◽  
Vol 19 (8) ◽  
pp. 2221-2225 ◽  
Author(s):  
J.Y. Lee ◽  
D.H. Bae ◽  
J.K. Lee ◽  
D.H. Kim
Keyword(s):  
Glass Formation ◽  
Liquidus Temperature ◽  
Eutectic Composition ◽  
Composition Range ◽  
Alloy System ◽  
Glass Forming Ability ◽  
Maximum Diameter ◽  
Bulk Glass ◽  
Glass Forming ◽  
Crystallization Onset

In this study, the effect of addition of Nb on glass formation in Ni–Ti–Zr–Si–Sn alloys has been studied. The composition range for bulk glass formation with Dmax > 2 mm (Dmax, maximum diameter for glass formation by injection cast method) becomes wider when compared with the non-Nb–containing alloy. The ΔTx (= Tx – Tg; Tx, crystallization onset temperature; Tg, glass transition temperature), Trg (= Tg/Tl; Tl, liquidus temperature) and γ [= Tx/(Tl + Tg)] values for the alloys Dmax > 2 mm are in the range of 40–59, 0.638–0.651, and 0.410–0.419, respectively. The compositions of the alloys (Dmax > 2 mm) are closer to pseudo-eutectic composition than that of the alloy without Nb, showing an improved glass forming ability. The critical cooling rate for glass formation (Dmax = 5 mm) is estimated to be order of approximately 40 K/s.

Glass Forming Ability in Transition Metal Films at 1010 K/s

1983 ◽  
Vol 28 ◽  
Author(s):  
M. Von Allmen ◽  
K. Affolter
Keyword(s):  
Transition Metal ◽  
Kinetic Analysis ◽  
Glass Formation ◽  
Time Lag ◽  
Metal Films ◽  
Glass Forming Ability ◽  
Physical Parameters ◽  
Nucleation Time ◽  
Glass Forming

ABSTRACTGlass formation by ns and ps laser quenching is investigated for the systems Au-Ti, Co-Ti, Cr-Ti and Zr-Ti. Glassy phases are found in all but the last system. These results (as well as earlier ones) show little correlation with published rules to predict glass forming ability, but are consistent with the kinetic analysis presented. Simple Physical parameters related to glass forming ability are discussed. Comparison with results for Cr-Ti allows a determination of the nucleation time-lag.

Glass formation from low molecular weight organic melts

1995 ◽  
Vol 10 (8) ◽  
pp. 2128-2136 ◽  
Author(s):  
Seong-Jin Kim ◽  
T.E. Karis
Keyword(s):  
Molecular Structure ◽  
Molecular Weight ◽  
Hydrogen Bonding ◽  
Glass Formation ◽  
Glass Forming Ability ◽  
Rotational Isomerism ◽  
Molecular Structures ◽  
Low Molecular Weight ◽  
Glass Forming ◽  
Temperature Crystallization

Glass formation from the melt of organic monomers was studied for a variety of different organic molecular structures with Tg near ambient temperature. Crystallization is suppressed by one or more of the molecular properties, hydrogen bonding, interlocking, dipolar, and hydrogen bonding, combined with hindered rotational isomerism. Examples of materials in each category are presented for illustration. The viscosity of undercooled liquids was characterized by the Vogel-Tammon-Fulcher (VTF) equation, η = A cxp[DT0/(T - T0)], where A, D, and T0 are experimentally determined parameters. Our experimental D values are discussed in relation to the molecular structure and glass formation mechanism. The insight provided by our interpretation is intended to assist in the design of new molecular structures with controlled viscosity-temperature characteristics, as well as glass-forming ability by cooling from melts.

Bulk Glass Formation in an Fe-Based Fe–Y–Zr–M (M = Cr, Co, Al)–Mo–B System

2004 ◽  
Vol 19 (3) ◽  
pp. 921-929 ◽  
Author(s):  
Z.P. Lu ◽  
C.T. Liu ◽  
C.A. Carmichael ◽  
W.D. Porter ◽  
S.C. Deevi
Keyword(s):  
Metallic Glasses ◽  
Glass Formation ◽  
Amorphous Alloys ◽  
High Strength ◽  
Supercooled Liquid ◽  
Glass Forming Ability ◽  
Bulk Glass ◽  
Bulk Amorphous Alloys ◽  
Glass Forming ◽  
Hardness Values

Several new bulk metallic glasses based on Fe–Y–Zr–(Co, Cr, Al)–Mo–B, which have a glass-forming ability superior to the best composition Fe61Zr10Co7Mo5W2B15 reported recently, have been successfully developed. The as-cast bulk amorphous alloys showed a distinctly high thermal stability with glass-transition temperatures above 900 K, supercooled liquid regions above 60 K, and high strength with Vickers hardness values larger than HV 1200. The suppression of the growth of primary phases in the molten liquids and the resultant low liquidus temperatures were found to be responsible for the superior glass-forming ability in these new alloys. It was found that the addition of 2% Y not only facilitated bulk glass formation, but the neutralizing effect of Y with oxygen in the molten liquids also improved the manufacturability of these amorphous alloys.

Glass-Forming Ability and Crystallization Kinetics of Hf-Ti-Cu-Ni-Al Bulk Metallic Glass

2012 ◽  
Vol 479-481 ◽  
pp. 1786-1789 ◽  
Author(s):  
Tie Jun Chen
Keyword(s):  
Thermal Stability ◽  
Crystallization Kinetics ◽  
Glass Formation ◽  
Glass Forming Ability ◽  
Ideal Condition ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Cross Sectional ◽  
Glass Forming

Multi-component Hf45.6Cu27.8Ni9.3Ti5Al12.4bulk metallic glasses (BMGs) were prepared successfully by casted into the water-cooled Cu mold. Characterization of the casted Hf45.6Cu27.8Ni9.3Ti5Al12.4rods was carried out by X-ray diffraction. The thermal stability and crystallization kinetics were followed by differential scanning calorimetry. The results show that the alloy Hf45.6Cu27.8Ni9.3Ti5Al12.4had a critical cylindrical rod diameter for glass formation, Dc, of 7 mm and the largest cross-sectional diameter (about 12.4mm) can be obtained in the ideal condition. The critical cooling rate for glass formation is 6.48K/s. The Hf45.6Cu27.8Ni9.3Ti5Al12.4BMG has larger glass forming ability and higher thermal stability.

Glass Formation and Glass-Forming Ability of Melts in AIIO–B2O3Binary Systems (AIIO = BeO, MgO, CaO, SrO, BaO, ZnO, CdO)

2004 ◽  
Vol 30 (3) ◽  
pp. 215-225 ◽  
Author(s):  
V. S. Minaev ◽  
V. Z. Petrova ◽  
S. P. Timoshenkov ◽  
R. R. Khafizov ◽  
V. A. Sharagov
Keyword(s):  
Glass Formation ◽  
Glass Forming Ability ◽  
Glass Forming
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