A calorimetric study of alloys along the Ti(Zn, Al)3 section

S. Delsante; G. Ghosh; G. Borzone

doi:10.1016/j.calphad.2008.08.003

A calorimetric study of alloys along the Ti(Zn, Al)₃ section

S. Delsante, G. Ghosh, G. Borzone^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

A calorimetric study of alloys along the section TiZn₃-TiAl₃ is carried out to determine their heat of formation (Δ_f 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 Δ_f 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.

Original language	English (US)
Pages (from-to)	50-54
Number of pages	5
Journal	Calphad: Computer Coupling of Phase Diagrams and Thermochemistry
Volume	33
Issue number	1
DOIs	https://doi.org/10.1016/j.calphad.2008.08.003
State	Published - Mar 2009

Funding

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.

Keywords

Direct calorimetry
Enthalpy of formation
First-principles calculations
Ti-Al-Zn alloys

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Computer Science Applications

Access to Document

10.1016/j.calphad.2008.08.003

Cite this

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title = "A calorimetric study of alloys along the Ti(Zn, Al)3 section",

abstract = "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.",

keywords = "Direct calorimetry, Enthalpy of formation, First-principles calculations, Ti-Al-Zn alloys",

author = "S. Delsante and G. Ghosh and G. Borzone",

note = "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.",

year = "2009",

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doi = "10.1016/j.calphad.2008.08.003",

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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.

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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

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KW - First-principles calculations

KW - Ti-Al-Zn alloys

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