Thermophysical Properties of a Fe-Cr-Mo Alloy in the Solid and Liquid Phase

2011 ◽  
Vol 83 (1) ◽  
pp. 43-54 ◽  
Author(s):  
R. K. Wunderlich ◽  
H. -J. Fecht ◽  
I. Egry ◽  
J. Etay ◽  
L. Battezzati ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Thermophysical Properties

scholarly journals Design of Composites by Infiltration Process: A Case Study of Liquid Ir-Si Alloy/SiC Systems

2021 ◽  
Author(s):  
Rada Novakovic ◽  
Simona Delsante ◽  
Donatella Giuranno
Keyword(s):  
Liquid Phase ◽  
Thermophysical Properties ◽  
Free Volume Theory ◽  
Infiltration Process ◽  
Reactive Infiltration ◽  
Structures And Properties ◽  
Energy Of Mixing ◽  
Predicted Values ◽  
Free Energy Of Mixing ◽  
S Model

The design of processing routes involving the presence of the liquid phase is mainly associated with the knowledge of its surface and transport properties. Despite this need, due to experimental difficulties related to high temperature measurements of metallic melts, for many alloy systems neither thermodynamic nor thermophysical properties data are available. A good example lacking these datasets represents the Ir-Si system, although over the last fifty years, the structures and properties of its solid phases have been widely investigated. To compensate the missing data, the Gibbs free energy of mixing of the Ir-Si liquid phase was calculated combining the model predicted values for the enthalpy and entropy of mixing using Miedema’s model and Free Volume Theory, respectively. Subsequently, in the framework of statistical mechanics and thermodynamics, the surface properties were calculated using the Quasi Chemical Approximation (QCA) for the regular solution, while to obtain the viscosity, the Moelwyn-Hughes (MH) and Terzieff models were applied. Subsequently, the predicted values of the abovementioned thermophysical properties were used to model the non-reactive infiltration isotherm of Ir-Si (eutectic) / SiC system.

scholarly journals Comparative study of thermophysical properties of Nickel in liquid phase

2018 ◽  
Vol 9 (2) ◽  
pp. 117
Author(s):  
N. O. Nenuwe ◽  
E. O. Agbalagba ◽  
E. A. Enaibe
Keyword(s):  
Liquid Phase ◽  
Comparative Study ◽  
Thermophysical Properties

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.

scholarly journals Design of Composites by Infiltration Process: A Case Study of Liquid Ir-Si Alloy/SiC Systems

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6024
Author(s):  
Rada Novakovic ◽  
Simona Delsante ◽  
Donatella Giuranno
Keyword(s):  
Liquid Phase ◽  
Thermophysical Properties ◽  
Free Volume Theory ◽  
Infiltration Process ◽  
Reactive Infiltration ◽  
Structures And Properties ◽  
Energy Of Mixing ◽  
Predicted Values ◽  
Free Energy Of Mixing

The design of processing routes involving the presence of the liquid phase is mainly associated with the knowledge of its surface and transport properties. Despite this need, due to experimental difficulties related to high temperature measurements of metallic melts, for many alloy systems neither thermodynamic nor thermophysical properties data are available. A good example of a system lacking these datasets is the Ir-Si system, although over the last fifty years, the structures and properties of its solid phases have been widely investigated. To compensate the missing data, the Gibbs free energy of mixing of the Ir-Si liquid phase was calculated combining the model predicted values for the enthalpy and entropy of mixing using Miedema’s model and the free volume theory, respectively. Subsequently, in the framework of statistical mechanics and thermodynamics, the surface properties were calculated using the quasi-chemical approximation (QCA) for the regular solution, while to obtain the viscosity, the Moelwyn-Hughes (MH) and Terzieff models were applied. Subsequently, the predicted values of the abovementioned thermophysical properties were used to model the non-reactive infiltration isotherm of Ir-Si (eutectic)/SiC system.

scholarly journals Thermophysical properties of the TiAl-2Cr-2Nb alloy in the liquid phase measured with an electromagnetic levitation device on board the International Space Station, ISS-EML

2021 ◽  
Vol 112 (10) ◽  
pp. 770-781
Author(s):  
Rainer K. Wunderlich ◽  
Markus Mohr ◽  
Yue Dong ◽  
Ulrike Hecht ◽  
Douglas M. Matson ◽  
...  
Keyword(s):  
Liquid Phase ◽  
International Space Station ◽  
Thermophysical Properties ◽  
Tial Alloy ◽  
Space Station ◽  
Electromagnetic Levitation ◽  
International Space ◽  
Processing Facility ◽  
Processing Device ◽  
Magnetohydrodynamic Fluid

Abstract Thermophysical properties of the γ-TiAl alloy Ti-48Al-2Cr-2Ni in the liquid phase were investigated with a containerless electromagnetic processing device on board the International Space Station. Containerless processing is warranted by the high liquidus temperature T liq = 1 776 K and the high dissolution reactivity in the liquid phase. Thermophysical properties investigated include the surface tension and viscosity, density, specific heat capacity and the electrical resistivity. The experiments were supported by magnetohydrodynamic fluid flow calculations. The Ti-48Al-2Cr-2Ni alloy could be stably processed over extended times in the stable and undercooled liquid phase and exhibited an exceptional degree of undercooling before solidification. Experimental processes and thermophysical properties so obtained will be described. The experiments demonstrate the broad experimental capabilities of the electromagnetic processing facility on the International Space Station for thermophysical investigations in the liquid phase of metallic alloys not achievable by other methods.

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