Short-range structural signature of excess specific heat and fragility of metallic-glass-forming supercooled liquids

2012 ◽  
Vol 85 (6) ◽  
Author(s):  
Jun Ding ◽  
Yong-Qiang Cheng ◽  
Hongwei Sheng ◽  
Evan Ma
Keyword(s):  
Metallic Glass ◽  
Specific Heat ◽  
Short Range ◽  
Supercooled Liquids ◽  
Glass Forming ◽  
Structural Signature

Thermodynamics of The Pd43Ni10Cu27P20 Bulk Metallic Glass Forming Alloy

2003 ◽  
Vol 806 ◽  
Author(s):  
Masahiro Kuno ◽  
Ludi A. Shadowspeaker ◽  
Jan Schroers ◽  
Ralf Busch
Keyword(s):  
Heat Capacity ◽  
Free Energy ◽  
Metallic Glass ◽  
Specific Heat ◽  
Bulk Metallic Glass ◽  
Gibbs Free Energy ◽  
Specific Heat Capacity ◽  
Undercooled Liquid ◽  
Glass Forming ◽  
Crystalline Mixture

ABSTRACTThe thermodynamics of the bulk metallic glass forming Pd43Ni10Cu27P20 alloy were investigated with differential scanning calorimetry (DSC). The specific heat capacity of the undercooled liquid with respect to the crystalline mixture was measured in the DSC simultaneously with the enthalpy of crystallization over the entire supercooled liquid region. The enthalpy, entropy, and Gibbs free energy change between the liquid and the crystalline mixture was determined from the specific heat capacity data. The calculated enthalpy function closely matched the enthalpies of crystallization that were measured in the DSC, which verifies the validity of the thermodynamic model used. A small Gibbs free energy difference between undercooled liquid and crystalline mixture was found for decreasing temperature in Pd43Ni10Cu27P20 when compared to other glass forming alloys. This reflects a small driving force for crystallization when undercooling this alloy and is the main contributing factor for its high glass forming ability.

AC Modulation Calorimetry of Undercooled Liquid Ti34Zr11Cu47Ni8 and Zr57Nb5Ni12.6Al10Cu15.4: An MSL-1 Experiment Using TEMPUS

1998 ◽  
Vol 551 ◽  
Author(s):  
S.C. Glade ◽  
D.S. Lee ◽  
R. Wunderlich ◽  
W.L. Johnson
Keyword(s):  
Metallic Glass ◽  
Specific Heat ◽  
Radiative Cooling ◽  
Undercooled Liquid ◽  
Free Energies ◽  
Nucleation Kinetics ◽  
Glass Forming ◽  
Maximum Undercooling ◽  
Electrostatic Levitator ◽  
Kinetics Of

AbstractAn AC modulation calorimetry (ACMC) experiment was performed on two bulk metallic glass forming alloys, Ti34Zr11CU47Ni8 (VIT 101) and Zr57Nb5Ni12.6Al10Cu15.4(VIT 106) on the recent MSL-1 shuttle flight using the TEMPUS hardware. VIT 106 exhibited a maximum undercooling of 140 K in free radiative cooling, while VIT 101 exhibited a smaller undercooling of 50 K. Specific heat measurements were done in both the stable and undercooled liquid regions. These results will be combined with further ground-based measurements in an electrostatic levitator for modeling the nucleation kinetics of these alloys and for calculation of the free energies and entropies of the undercooled liquids in these systems.

scholarly journals Coincidence of collective relaxation anomaly and specific heat peak in a bulk metallic glass-forming liquid

2015 ◽  
Vol 92 (2) ◽  
Author(s):  
Abhishek Jaiswal ◽  
Andrey Podlesynak ◽  
Georg Ehlers ◽  
Rebecca Mills ◽  
Stephanie O'Keeffe ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Specific Heat ◽  
Bulk Metallic Glass ◽  
Glass Forming

Thermophysical Properties of Bulk Metallic Glasses in the Stable and Undercooled Liquid – A Microgravity Investigation

2000 ◽  
Vol 644 ◽  
Author(s):  
Hans-Jörg Fecht ◽  
Rainer K. Wunderlich ◽  
Stephen C. Glade ◽  
William L. Johnson
Keyword(s):  
Liquid Phase ◽  
Metallic Glass ◽  
Metallic Glasses ◽  
Thermophysical Properties ◽  
Short Range ◽  
Short Range Order ◽  
Undercooled Liquid ◽  
Pronounced Change ◽  
Glass Forming ◽  
Total Hemispherical Emissivity

AbstractThe thermophysical properties in the stable and undercooled liquid phase of a series of Zr- based metallic glass forming alloys have been investigated under the condition of reduced gravity on board spacelab. Properties measured included the specific heat capacity and the enthalpy of fusion, the electrical resistivity, the total hemispherical emissivity, and the thermal transport properties. Results for the bulk metallic glass forming alloys indicate a pronounced change in chemical short range order in the liquid phase as function of temperature.

Effect of Compositional Short Range Order on Glass Formation in Binary Metallic System

2002 ◽  
Vol 754 ◽  
Author(s):  
Hao Chen ◽  
Mahadevan Khantha ◽  
Takeshi Egami
Keyword(s):  
Glass Transition ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glass Formation ◽  
Short Range ◽  
Short Range Order ◽  
Glass Forming Ability ◽  
Range Order ◽  
Dynamics Simulation ◽  
Glass Forming

ABSTRACTMolecular Dynamics simulation was carried out to study the glass transition and crystallization in the metal-metalloid binary system with pair-wise potentials. The results show that a repulsive potential between metalloid (small) atoms increases the glass forming ability. The observation is consistent with the recent theory of bulk metallic glass formation through local glass transition and nano-glass formation. The theory predicted that the compositional short-range order (CSRO) prevents the small atom pairing so as to increase the glass forming ability (GFA). The present results demonstrate the important role of CSRO in bulk metallic glass formation.

Structural topological signature of high-temperature non-Arrhenius crossover in metallic glass-forming liquids

2021 ◽  
Vol 200 ◽  
pp. 113926
Author(s):  
Nannan Ren ◽  
Lina Hu ◽  
Bing Wang ◽  
Kaikai Song ◽  
Pengfei Guan
Keyword(s):  
High Temperature ◽  
Metallic Glass ◽  
Glass Forming

Frequency-dependent specific heat in quantum supercooled liquids: A mode-coupling study

2021 ◽  
Vol 154 (16) ◽  
pp. 164512
Author(s):  
Ankita Das ◽  
Eran Rabani ◽  
Kunimasa Miyazaki ◽  
Upendra Harbola
Keyword(s):  
Specific Heat ◽  
Mode Coupling ◽  
Supercooled Liquids ◽  
Frequency Dependent
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