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

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.

Strong Liquid Behavior of Zr-Ti-Cu-Ni-Be Bulk Metallic Glass Forming Alloys

1996 ◽  
Vol 455 ◽  
Author(s):  
Ralf Busch ◽  
Andreas Masuhr ◽  
Eric Bakke ◽  
William L. Johnson
Keyword(s):  
Glass Transition ◽  
Melting Point ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Supercooled Liquid ◽  
Glass Transition Region ◽  
Glass Forming ◽  
Liquid Behavior ◽  
Metallic Liquids ◽  
Microscopic Origin

ABSTRACTThe viscosities of the Zr46.75Ti8.25Cu7.5Ni10Be27.5 and the Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass forming liquids was determined from the melting point down to the glass transition in the entire temperature range of the supercooled liquid. The temperature dependence of the viscosity in the supercooled liquid obeys the Vogel-Fulcher-Tammann (VFT) relation. The fragility index D is about 20 for both alloys and the ratio between glass transition temperature and VFT temperature is found to be 1.5. A comparison with other glass forming systems shows that these bulk metallic glass formers are strong liquids comparable to sodium silicate glass. Furthermore, they are the strongest among metallic glass forming liquids. This behavior is a main contributing factor to the glass forming ability since it implicates a higher viscosity from the melting point down to the glass transition compared to other metallic liquids. Thus, the kinetics in the supercooled liquid is sluggish and yields a low critical cooling rate for glass formation. The relaxation behavior in the glass transition region of the alloys is consistent with their strong glassy nature as reflected by a stretching exponent that is close to 0.8. The microscopic origin of the strong liquid behavior of bulk metallic glass formers is discussed.

scholarly journals In-situ study of crystallization kinetics in ternary bulk metallic glass alloys with different glass forming abilities

2014 ◽  
Vol 105 (20) ◽  
pp. 201906 ◽  
Author(s):  
Si Lan ◽  
Xiaoya Wei ◽  
Jie Zhou ◽  
Zhaoping Lu ◽  
Xuelian Wu ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Crystallization Kinetics ◽  
Glass Forming ◽  
In Situ Study

Effects of Nb minor addition on atomic structure and glass forming ability of Zr55Cu30Ni5Al10 bulk metallic glass

2019 ◽  
Vol 6 (6) ◽  
pp. 065202 ◽  
Author(s):  
Majid Samavatian ◽  
Reza Gholamipour ◽  
Vahid Samavatian ◽  
Fahimeh Farahani
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Atomic Structure ◽  
Glass Forming Ability ◽  
Glass Forming ◽  
Minor Addition

Progress of solid-state reaction during mechanical alloying of Zr-Al-Cu-Ni bulk metallic glass-forming alloys

1997 ◽  
Vol 226-228 ◽  
pp. 383-387 ◽  
Author(s):  
M. Seidel ◽  
M. Reibold ◽  
I. Bächer ◽  
H.-D. Bauer ◽  
J. Eckert ◽  
...  
Keyword(s):  
Solid State ◽  
Metallic Glass ◽  
Mechanical Alloying ◽  
Bulk Metallic Glass ◽  
Solid State Reaction ◽  
Glass Forming
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