Microcalorimetry and thermochemistry of alloys

1988 ◽  
Vol 66 (4) ◽  
pp. 824-829 ◽  
Author(s):  
Jean Pierre Bros
Keyword(s):  
Phase Diagram ◽  
Thermodynamic Description ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Enthalpies Of Formation ◽  
Miscibility Gap ◽  
Entire Concentration Range ◽  
Calvet Microcalorimeter ◽  
Calculated Liquid ◽  
Liquid Miscibility Gap

High temperature microcalorimetry is a very fruitful technique for increasing our knowledge of the thermochemistry of multicomponent alloys. As a good example, calorimetric results obtained for the Al + Bi + Ga system have been selected. Using a Calvet microcalorimeter and the indirect drop method, enthalpies of formation were measured over the entire concentration range between 725 and 1170 K and several points of the phase diagram were deduced from these calorimetric results. By means of a computer program, the Al + Bi + Ga equilibrium phase diagram was calculated and thus a thermodynamic description can be predicted. Making use of some simplifying hypotheses, the results indicate a satisfactory agreement between the experimental and the calculated liquid miscibility gap.

Phase-Field Modelling of radiation induced microstructures

2015 ◽  
Vol 1743 ◽  
Author(s):  
L. Luneville ◽  
G. Demange ◽  
V. Pontikis ◽  
D. Simeone
Keyword(s):  
Phase Diagram ◽  
Phase Field ◽  
Binary Systems ◽  
Canonical Ensemble ◽  
Excess Free Energy ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Miscibility Gap ◽  
Radiation Induced ◽  
Grand Canonical

ABSTRACTThis work shows that realistic irradiation-induced phase separation and the resulting microstructures can be obtained via an adapted Phase Field (PF) modelling combined with atomistic Monte Carlo simulations in the pseudo-grand canonical ensemble. The last allow for calculating the equilibrium phase diagram of the silver-copper alloy, chosen as a model of binary systems with large miscibility gap and, for extracting the parameters of the excess free-energy PF functional. Relying on this methodology, the equilibrium phase diagram of the alloy is predicted in excellent agreement with its experimental counterpart whereas, under irradiation, the predicted microstructures are functions of the irradiation parameters. Different irradiation conditions trigger the formation of various microstructures consistently presented as a non-equilibrium “phase diagram” aiming at facilitating the comparison with experimental observations.

Intermetallic Formation in the Aluminum–Copper System

2003 ◽  
Vol 10 (04) ◽  
pp. 677-683 ◽  
Author(s):  
E. B. Hannech ◽  
N. Lamoudi ◽  
N. Benslim ◽  
B. Makhloufi
Keyword(s):  
Electron Microscopy ◽  
Phase Diagram ◽  
Solid Solution ◽  
Intermetallic Layer ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Diffusion Couples ◽  
Intermetallic Formation ◽  
Parabolic Law ◽  
Scanning Electron

Intermetallic formation at 425°C in the aluminum–copper system has been studied by scanning electron microscopy using welded diffusion couples. Several Al–Cu phases predicted by the equilibrium phase diagram of the elements and voids taking place in the diffusion zone have been detected in the couples. The predominant phases were found to be Al 2 Cu 3 and the solid solution of Al in Cu, α. The growth of the intermetallic layer obeyed the parabolic law.

Equilibrium phase diagram of polystyrene and 8CB

1999 ◽  
Vol 37 (15) ◽  
pp. 1841-1848 ◽  
Author(s):  
Farida Benmouna ◽  
Abdelylah Daoudi ◽  
Fr�d�rick Roussel ◽  
Jean-Marc Buisine ◽  
Xavier Coqueret ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram

scholarly journals Formation of Intermediate Phases and Supersaturated Solid Solution in Al-Cu System during Diffusion

2018 ◽  
Vol 383 ◽  
pp. 31-35 ◽  
Author(s):  
Alexey Rodin ◽  
Nataliya Goreslavets
Keyword(s):  
Phase Diagram ◽  
Solid Solution ◽  
High Temperature ◽  
Chemical Composition ◽  
Low Temperature ◽  
Supersaturated Solid Solution ◽  
Diffusion Processes ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Intermediate Phases

The study of diffusion processes in the aluminum - copper system was carried out at the temperature 350 and 520 °C. Special attention was paid on the chemical composition of the system near Al/Cu interface. It was determined that the intermediate phases in the system, corresponding to the equilibrium phase diagram, were not formed at low temperature. At high temperature the intermediate phases forms starting with Cu - rich phases. In both cases supersaturated solid solution of copper in aluminum could be observed near the interface.

scholarly journals Equilibrium Phase Diagram of the Zn–Ag Alloy

2018 ◽  
Vol 20 (3) ◽  
pp. 72-84
Author(s):  
Alexey Korolev ◽  
◽  
Gennagy Maltsev ◽  
Konstantin Timofeev ◽  
Vladimir Lobanov ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram

Equilibrium Phase Diagram of Li＋,Na＋∥,CO32－,B4O72－-H2O Quaternary System at 288 K

2002 ◽  
Vol 18 (09) ◽  
pp. 835-837 ◽  
Author(s):  
Sang Shi-Hua ◽  
◽  
Yin Hui-An ◽  
Tang Ming-Lin ◽  
Zhang Yun-Xiang
Keyword(s):  
Phase Diagram ◽  
Quaternary System ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram

The equilibrium phase diagram of the magnesium–copper–yttrium system

2008 ◽  
Vol 40 (7) ◽  
pp. 1064-1076 ◽  
Author(s):  
Mohammad Mezbahul-Islam ◽  
Dmytro Kevorkov ◽  
Mamoun Medraj
Keyword(s):  
Phase Diagram ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram
Sign in / Sign up

Export Citation Format

Share Document