TY - JOUR
T1 - Thermodynamic modelling of the Zn-Zr system
AU - Arroyave, R.
AU - Liu, Z. K.
N1 - Funding Information:
The authors would like to thank D. Shin for supplying the calculations on the hcp Zn–Zr SQS. This project is supported by the National Science Foundation through the CAREER award DMR-9983532, the Information Technology Research Grant DMR-0205232 and DMR-0510180.
PY - 2006/3
Y1 - 2006/3
N2 - The Zn-Zr system has been thermodynamically modelled by combining existing experimental data and first-principles calculations through the CALPHAD approach. In general, the agreement between the thermodynamic model and the experimental/first-principles results is satisfactory. The Zn2Zr 3 and ZnZr2 intermetallic compounds do not belong to the accepted Zn-Zr phase diagram but their existence has been reported extensively in the literature, especially in experimental work on cast Mg-Zn-Zr alloys. The present work confirms their likely stability at high temperatures. A modified Zn-Zr phase diagram that includes these two compounds has been calculated. Additionally, three different models describing the excess Gibbs energy for the liquid and two for the solid solutions are used and their predictions are compared. The thermodynamic model with the best fit to the experimental data described the liquid phase as a solution of Zn, Zr and a ' Zn2Zr' associate. The resulting thermodynamic description for this binary is considered to be robust enough to be incorporated into the ternary description of the Mg-Zn-Zr system which will be used in the future for the analysis of the grain refinement of these alloys.
AB - The Zn-Zr system has been thermodynamically modelled by combining existing experimental data and first-principles calculations through the CALPHAD approach. In general, the agreement between the thermodynamic model and the experimental/first-principles results is satisfactory. The Zn2Zr 3 and ZnZr2 intermetallic compounds do not belong to the accepted Zn-Zr phase diagram but their existence has been reported extensively in the literature, especially in experimental work on cast Mg-Zn-Zr alloys. The present work confirms their likely stability at high temperatures. A modified Zn-Zr phase diagram that includes these two compounds has been calculated. Additionally, three different models describing the excess Gibbs energy for the liquid and two for the solid solutions are used and their predictions are compared. The thermodynamic model with the best fit to the experimental data described the liquid phase as a solution of Zn, Zr and a ' Zn2Zr' associate. The resulting thermodynamic description for this binary is considered to be robust enough to be incorporated into the ternary description of the Mg-Zn-Zr system which will be used in the future for the analysis of the grain refinement of these alloys.
UR - http://www.scopus.com/inward/record.url?scp=31644450936&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=31644450936&partnerID=8YFLogxK
U2 - 10.1016/j.calphad.2005.12.006
DO - 10.1016/j.calphad.2005.12.006
M3 - Article
AN - SCOPUS:31644450936
SN - 0364-5916
VL - 30
SP - 1
EP - 13
JO - Calphad: Computer Coupling of Phase Diagrams and Thermochemistry
JF - Calphad: Computer Coupling of Phase Diagrams and Thermochemistry
IS - 1
ER -