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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)50-54
Number of pages5
JournalCalphad: Computer Coupling of Phase Diagrams and Thermochemistry
Volume33
Issue number1
DOIs
StatePublished - Mar 1 2009

Keywords

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

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Computer Science Applications

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