Continuous Ordering Reactions in NiAl/Ni2, AlTi Dual Phase Alloys

1988 ◽  
Vol 133 ◽  
Author(s):  
N. C. Tso ◽  
J. M. Sanchez
Keyword(s):  
Phase Equilibrium ◽  
Ternary System ◽  
Metastable Phase ◽  
Alloy System ◽  
Cluster Variation Method ◽  
Variation Method ◽  
Dual Phase ◽  
Metastable Phase Equilibrium ◽  
Decomposition Reactions ◽  
Cluster Variation

ABSTRACTThe Cluster Variation Method is used to study metastable phase equilibrium and possible ordering reactions in the Ni2AlTi⇆;NiAl dual phase alloy system. The Cluster Variation Method was also used to model the corresponding binary alloys and the results were extrapolated to the ternary system. The occurrence of a continuous ordering reaction in the Ni-Al-Ti system is proposed and possible decomposition reactions are discussed.

scholarly journals First-Principles Study of Intermetallic Phase Stability in the Ternary Ti-Al-Nb Alloy System

1994 ◽  
Vol 364 ◽  
Author(s):  
Mark Asta ◽  
Alim Ormeci ◽  
John M. Wills ◽  
Robert C. Albers
Keyword(s):  
First Principles ◽  
Intermetallic Phase ◽  
Alloy System ◽  
Cluster Variation Method ◽  
Ternary Alloys ◽  
Interaction Parameters ◽  
Variation Method ◽  
Cluster Variation ◽  
The Stability ◽  
Alloy Thermodynamic

AbstractThe stability of bcc-based phases in the Ti-Al-Nb alloy system has been studied from first-principles using a combination of ab-initio total energy and cluster variation method (CVM) calculations. Total energies have been computed for 18 binary and ternary bcc superstructures in order to determine low temperature ordering tendencies. From the results of these calculations a set of effective cluster interaction parameters have been derived. These interaction parameters are required input for CVM computations of alloy thermodynamic properties. The CVM has been used to study the effect of composition on finite-temperature ordering tendencies and site preferences for bcc-based phases. Strong ordering tendencies are observed for binary Nb-Al and Ti-Al bcc phases as well as for ternary alloys with compositions near Ti2AlNb. For selected superstructures we have also analyzed structural stabilities with respect to tetragonal distortions which transform the bcc into an fcc lattice. Instabilities with respect to such distortions are found to exist for binary but not ternary bcc compounds.

Metastable Phase Equilibrium of a Ternary System of K+,Mg2+/B4O72--—H2O at 25°C

2013 ◽  
Vol 662 ◽  
pp. 468-472 ◽  
Author(s):  
Xiao Hua Ma ◽  
Sun Bai ◽  
Li Wu ◽  
Zhi Liang Jin
Keyword(s):  
Phase Diagram ◽  
Phase Transformation ◽  
Phase Equilibrium ◽  
Ternary System ◽  
Equilibrium State ◽  
Metastable Phase ◽  
Metastable Equilibrium ◽  
Metastable Phase Equilibrium ◽  
Isothermal Solubility

The isothermal solubility of the ternary system K+,Mg2+/B4O72-—H2O at 25°C has been studied and the phase diagram is determined. The results show that the system is of the simple eutonic type and can be in metastable equilibrium state within 8—16 hours. The phase diagram consists of two solubility branches corresponding to the crystallization areas of K2B4O7•4H2O and MgB4O7•9H2O. The composition of the eutonic point is MgB4O7,0.5279%(Wt%) and K2B4O7,13.9629%(Wt%) respectively. The replicate experiments proved that the phase transformation of hungtsaoite (MgB4O7•9H2O) occurs after a 20 hours epuilibrium.

Study of the stable and metastable phase equilibrium of a ternary system (NaCl + Na2SO4 + H2O) in coal-to-liquids wastewater at 323.15 K

2020 ◽  
Vol 197 ◽  
pp. 121-130
Author(s):  
Li Zhu ◽  
Yu-Long Ma ◽  
Shao-Ying Ge ◽  
Di Wu ◽  
Cheng Che ◽  
...  
Keyword(s):  
Phase Equilibrium ◽  
Ternary System ◽  
Metastable Phase ◽  
Metastable Phase Equilibrium
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