TY - JOUR
T1 - A calorimetric study of alloys along the Ti(Zn, Al)3 section
AU - Delsante, S.
AU - Ghosh, G.
AU - Borzone, G.
N1 - Funding Information:
The authors would like to dedicate this contribution to the memory of Prof. Riccardo Ferro. They want to express their thanks for his teaching in Thermochemistry and Materials Chemistry. His legacy as an eminent scientist together with his human qualities will remain for all of them extremely important reference points. Research at Northwestern University was supported by the U. S. Department of Energy, Office of Basic Energy Sciences, under Contract No. DE-FG02-02ER45997.
PY - 2009/3
Y1 - 2009/3
N2 - A calorimetric study of alloys along the section TiZn3-TiAl3 is carried out to determine their heat of formation (Δf H{ring operator}) at 300 K using a high temperature direct drop calorimeter. The target compositions of the alloys lie in the range of 10-65 at.% Al. The structure and composition of the reacted samples are characterized by X-ray diffraction and electron probe microanalysis. The following values of Δf H{ring operator} (in kJ/mol-atom) at 300 K are obtained (by interpolation) for L 12- Ti(Zn,Al)3 solid solution: -27±1 (at Ti25Zn65Al10), -30±1 (at Ti25Zn55Al20), -32±1 (at Ti25Zn45Al30), -34±1 (at Ti25Zn35Al40), -35±1 (at Ti25Zn25Al50) and -36±1 (at Ti25Zn15Al60). Calorimetric data are compared with the formation energy of L 12- Ti(Zn,Al)3 alloys calculated from first-principles and sublattice cluster expansion, showing a very good agreement. Stabilization of L 12- Al3Ti, by substituting Zn for Al, offers a potential to introduce it as strengthening precipitates in Al alloys.
AB - A calorimetric study of alloys along the section TiZn3-TiAl3 is carried out to determine their heat of formation (Δf H{ring operator}) at 300 K using a high temperature direct drop calorimeter. The target compositions of the alloys lie in the range of 10-65 at.% Al. The structure and composition of the reacted samples are characterized by X-ray diffraction and electron probe microanalysis. The following values of Δf H{ring operator} (in kJ/mol-atom) at 300 K are obtained (by interpolation) for L 12- Ti(Zn,Al)3 solid solution: -27±1 (at Ti25Zn65Al10), -30±1 (at Ti25Zn55Al20), -32±1 (at Ti25Zn45Al30), -34±1 (at Ti25Zn35Al40), -35±1 (at Ti25Zn25Al50) and -36±1 (at Ti25Zn15Al60). Calorimetric data are compared with the formation energy of L 12- Ti(Zn,Al)3 alloys calculated from first-principles and sublattice cluster expansion, showing a very good agreement. Stabilization of L 12- Al3Ti, by substituting Zn for Al, offers a potential to introduce it as strengthening precipitates in Al alloys.
KW - Direct calorimetry
KW - Enthalpy of formation
KW - First-principles calculations
KW - Ti-Al-Zn alloys
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U2 - 10.1016/j.calphad.2008.08.003
DO - 10.1016/j.calphad.2008.08.003
M3 - Article
AN - SCOPUS:61549099026
SN - 0364-5916
VL - 33
SP - 50
EP - 54
JO - Calphad: Computer Coupling of Phase Diagrams and Thermochemistry
JF - Calphad: Computer Coupling of Phase Diagrams and Thermochemistry
IS - 1
ER -